Merged feature/more-state-provider-cleanup into integration/sprint-40

.circleci/config.yml

@@ -98,6 +98,31 @@ commands:
             - ~/.m2
           key: v1-dependencies-{{ checksum "pom.xml" }}
 
+  install_asciidoctor:
+    steps:
+      - checkout
+      - run:
+          name: Install asciidoctor
+          command: |
+            sudo apt-get update
+            sudo apt install -y asciidoctor
+
+  run_asciidoctor:
+    steps:
+      - run:
+          name: Run asciidoctor
+          command: |
+            cd docs
+            asciidoctor -a docinfo=shared index.adoc
+
+  upload_docs_site:
+    steps:
+      - run:
+          name: scp html to justinsgotskinnylegs.com
+          command: |
+            cd docs
+            scp index.html dkelkhoff@45.79.44.221:/mnt/first-volume/dkelkhoff/nginx/html/justinsgotskinnylegs.com/qqq-docs.html
+
 jobs:
   mvn_test:
     executor: localstack/default
@@ -114,6 +139,13 @@ jobs:
       - mvn_verify
       - mvn_jar_deploy
 
+  publish_asciidoc:
+    executor: localstack/default
+    steps:
+      - install_asciidoctor
+      - run_asciidoctor
+      - upload_docs_site
+
 workflows:
   test_only:
     jobs:
@@ -135,3 +167,9 @@ workflows:
             tags:
               only: /(version|snapshot)-.*/
 
+  publish-docs:
+    jobs:
+      - publish_asciidoc:
+          filters:
+            branches:
+              only: /dev/

docs/metaData/Fields.adoc

@@ -21,5 +21,99 @@ Used to set values in the `displayValues` map within a `QRecord`.
 * `possibleValueSourceName` - *String* - Reference to a {link-pvs} to be used for this field.
 Values in this field should correspond to ids from the referenced Possible Value Source.
 * `maxLength` - *Integer* - Maximum length (number of characters) allowed for values in this field.
-Only applicable for fields with `type=STRING`.
+Only applicable for fields with `type=STRING`.  Needs to be used with a `FieldBehavior` of type `ValueTooLongBehavior`.
-* `
+
+==== Field Behaviors
+Additional behaviors can be attached to fields through the use of the `behaviors` attribute,
+which is a `Set` of 0 or more instances of implementations of the `FieldBehavior` interface.
+Note that in some cases, these instances may be `enum` constants,
+but other times may be regular Objects.
+
+QQQ provides a set of common field behaviors.
+Applications can also define their own field behaviors by implementing the `FieldBehavior` interface,
+and attaching instances of their custom behavior classes to fields.
+
+===== ValueTooLongBehavior
+Used on String fields.  Requires the field to have a `maxLength` set.
+Depending on the chosen instance of this enum, before a record is Inserted or Updated,
+if the value in the field is longer than the `maxLength`, then one of the following actions can occur:
+
+* `TRUNCATE` - The value will be simply truncated to the `maxLength`.
+* `TRUNCATE_ELLIPSIS` - The value will be truncated to 3 characters less than the `maxLength`, and three periods (an ellipsis) will be placed at the end.
+* `ERROR` - An error will be reported, and the record will not be inserted or updated.
+* `PASS_THROUGH` - Nothing will happen.  This is the same as not having a `ValueTooLongBehavior` on the field.
+
+[source,java]
+.Examples of using ValueTooLongBehavior
+----
+   new QFieldMetaData("sku", QFieldType.STRING)
+      .withMaxLength(40),
+      .withBehavior(ValueTooLongBehavior.ERROR),
+
+   new QFieldMetaData("reason", QFieldType.STRING)
+      .withMaxLength(250),
+      .withBehavior(ValueTooLongBehavior.TRUNCATE_ELLIPSIS),
+
+----
+
+===== DynamicDefaultValueBehavior
+Used to set a dynamic default value to a field when it is being inserted or updated.
+For example, instead of having a hard-coded `defaultValue` specified in the field meta-data,
+and instead of having to add, for example, a pre-insert custom action.
+
+* `CREATE_DATE` - On inserts, sets the field's value to the current time.
+* `MODIFY_DATE` - On inserts and updates, sets the field's value to the current time.
+* `USER_ID` - On inserts and updates, sets the field's value to the current user's id (but only if the value is currently null).
+
+_Note that the `QInstanceEnricher` will, by default, add the `CREATE_DATE` and `MODIFY_DATE` `DynamicDefaultValueBehavior`
+options to any fields named `"createDate"` or `"modifyDate"`.
+This behavior can be disabled by setting the `configAddDynamicDefaultValuesToFieldsNamedCreateDateAndModifyDate` property
+on the `QInstanceEnricher` instance used by the application to `false`._
+
+[source,java]
+.Examples of using DynamicDefaultValueBehavior
+----
+   new QFieldMetaData("createDate", QFieldType.DATE_TIME)
+      .withBehavior(DynamicDefaultValueBehavior.CREATE_DATE),
+
+   new QFieldMetaData("modifyDate", QFieldType.DATE_TIME)
+      .withBehavior(DynamicDefaultValueBehavior.MODIFY_DATE),
+
+   new QFieldMetaData("createdByUserId", QFieldType.STRING)
+      .withBehavior(DynamicDefaultValueBehavior.USER_ID),
+----
+
+===== DateTimeDisplayValueBehavior
+By default, in QQQ, fields of type `DATE_TIME` are stored in UTC,
+and their values in a QRecord is a java `Instant` instance, which is always UTC.
+However, frontends will prefer to display date-time values in the user's local Time Zone whenever possible.
+
+Using `DateTimeDisplayValueBehavior` allows a `DATE_TIME` field to be displayed in a different Time Zone.
+An example use-case for this would be displaying airplane flight times,
+where you would want a flight from California to New York to display Pacific Time for its departure time,
+and Eastern Time for its arrival.
+
+An instance of `DateTimeDisplayValueBehavior` can be configured to either use a hard-coded time `ZoneId`
+(for example, to always show users UTC, or a business's home-office time zone).
+Or, it can be set up to get the time zone to use from another field in the table.
+
+[source,java]
+.Examples of using DateTimeDisplayValueBehavior
+----
+new QTableMetaData().withName("flights").withFields(List.of(
+   ...
+   new QFieldMetaData("departureTimeZoneId", QFieldType.STRING),
+   new QFieldMetaData("arrivaTimeZoneId", QFieldType.STRING),
+
+   new QFieldMetaData("departureTime", QFieldType.DATE_TIME)
+      .withBehavior(new DateTimeDisplayValueBehavior()
+         .withZoneIdFromFieldName("departureTimeZoneId")),
+
+   new QFieldMetaData("arrivalTime", QFieldType.DATE_TIME)
+      .withBehavior(new DateTimeDisplayValueBehavior()
+         .withZoneIdFromFieldName("arrivalTimeZoneId"))
+
+   new QFieldMetaData("ticketSaleStartDateTime", QFieldType.DATE_TIME)
+      .withBehavior(new DateTimeDisplayValueBehavior()
+         .withDefaultZoneId("UTC"))
+----

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/actions/async/AsyncJobStatus.java

@@ -31,6 +31,7 @@ import java.io.Serializable;
  *******************************************************************************/
 public class AsyncJobStatus implements Serializable
 {
+   private String        jobName;
    private AsyncJobState state;
    private String        message;
    private Integer       current;
@@ -187,4 +188,36 @@ public class AsyncJobStatus implements Serializable
    {
       this.cancelRequested = cancelRequested;
    }
+
+
+
+   /*******************************************************************************
+    ** Getter for jobName
+    *******************************************************************************/
+   public String getJobName()
+   {
+      return (this.jobName);
+   }
+
+
+
+   /*******************************************************************************
+    ** Setter for jobName
+    *******************************************************************************/
+   public void setJobName(String jobName)
+   {
+      this.jobName = jobName;
+   }
+
+
+
+   /*******************************************************************************
+    ** Fluent setter for jobName
+    *******************************************************************************/
+   public AsyncJobStatus withJobName(String jobName)
+   {
+      this.jobName = jobName;
+      return (this);
+   }
+
 }

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/actions/async/NonPersistedAsyncJobCallback.java

@@ -0,0 +1,65 @@
+/*
+ * QQQ - Low-code Application Framework for Engineers.
+ * Copyright (C) 2021-2024.  Kingsrook, LLC
+ * 651 N Broad St Ste 205 # 6917 | Middletown DE 19709 | United States
+ * contact@kingsrook.com
+ * https://github.com/Kingsrook/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.kingsrook.qqq.backend.core.actions.async;
+
+
+import java.util.UUID;
+import com.kingsrook.qqq.backend.core.logging.QLogger;
+
+
+/*******************************************************************************
+ ** subclass designed to be used when we want there to be an instance (so code
+ ** doesn't have to all be null-tolerant), but there's no one who will ever be
+ ** reading the status data, so we don't need to store the object in a
+ ** state provider.
+ *******************************************************************************/
+public class NonPersistedAsyncJobCallback extends AsyncJobCallback
+{
+   private static final QLogger LOG = QLogger.getLogger(NonPersistedAsyncJobCallback.class);
+   private final AsyncJobStatus asyncJobStatus;
+
+
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   public NonPersistedAsyncJobCallback(UUID jobUUID, AsyncJobStatus asyncJobStatus)
+   {
+      super(jobUUID, asyncJobStatus);
+      this.asyncJobStatus = asyncJobStatus;
+   }
+
+
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   @Override
+   protected void storeUpdatedStatus()
+   {
+      ///////////////////////////////////////////////////////////
+      // todo - downgrade or remove this before merging to dev //
+      ///////////////////////////////////////////////////////////
+      LOG.info("Not persisting status from a NonPersistedAsyncJobCallback: " + asyncJobStatus.getJobName() + " / " + asyncJobStatus.getMessage());
+   }
+
+}

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/actions/values/QValueFormatter.java

@@ -28,7 +28,6 @@ import java.time.LocalDateTime;
 import java.time.LocalTime;
 import java.time.ZonedDateTime;
 import java.time.format.DateTimeFormatter;
-import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
@@ -364,7 +363,9 @@ public class QValueFormatter
             }
          }
 
-         setDisplayValuesInRecord(fieldMap, record);
+         ValueBehaviorApplier.applyFieldBehaviors(ValueBehaviorApplier.Action.FORMATTING, QContext.getQInstance(), table, records, null);
+
+         setDisplayValuesInRecord(table, fieldMap, record, true);
          record.setRecordLabel(formatRecordLabel(table, record));
       }
    }
@@ -374,61 +375,49 @@ public class QValueFormatter
    /*******************************************************************************
     ** For a list of records, set their recordLabels and display values
     *******************************************************************************/
-   public static void setDisplayValuesInRecords(Collection<QFieldMetaData> fields, List<QRecord> records)
+   public static void setDisplayValuesInRecords(QTableMetaData table, Map<String, QFieldMetaData> fields, List<QRecord> records)
    {
       if(records == null)
       {
          return;
       }
 
-      for(QRecord record : records)
+      if(table != null)
       {
-         setDisplayValuesInRecord(fields, record);
+         ValueBehaviorApplier.applyFieldBehaviors(ValueBehaviorApplier.Action.FORMATTING, QContext.getQInstance(), table, records, null);
-      }
-   }
-
-
-
-   /*******************************************************************************
-    ** For a list of records, set their recordLabels and display values
-    *******************************************************************************/
-   public static void setDisplayValuesInRecords(Map<String, QFieldMetaData> fields, List<QRecord> records)
-   {
-      if(records == null)
-      {
-         return;
       }
 
       for(QRecord record : records)
       {
-         setDisplayValuesInRecord(fields, record);
+         setDisplayValuesInRecord(table, fields, record, true);
       }
    }
 
 
 
    /*******************************************************************************
-    ** For a list of records, set their display values
+    ** For a single record, set its display values - public version of this.
     *******************************************************************************/
-   public static void setDisplayValuesInRecord(Collection<QFieldMetaData> fields, QRecord record)
+   public static void setDisplayValuesInRecord(QTableMetaData table, Map<String, QFieldMetaData> fields, QRecord record)
    {
-      for(QFieldMetaData field : fields)
+      setDisplayValuesInRecord(table, fields, record, false);
-      {
-         if(record.getDisplayValue(field.getName()) == null)
-         {
-            String formattedValue = formatValue(field, record.getValue(field.getName()));
-            record.setDisplayValue(field.getName(), formattedValue);
    }
-      }
-   }
-
 
 
    /*******************************************************************************
-    ** For a list of records, set their display values
+    ** For a single record, set its display values - where caller (meant to stay private)
+    ** can specify if they've already done fieldBehaviors (to avoid re-doing).
     *******************************************************************************/
-   public static void setDisplayValuesInRecord(Map<String, QFieldMetaData> fields, QRecord record)
+   private static void setDisplayValuesInRecord(QTableMetaData table, Map<String, QFieldMetaData> fields, QRecord record, boolean alreadyAppliedFieldDisplayBehaviors)
    {
+      if(!alreadyAppliedFieldDisplayBehaviors)
+      {
+         if(table != null)
+         {
+            ValueBehaviorApplier.applyFieldBehaviors(ValueBehaviorApplier.Action.FORMATTING, QContext.getQInstance(), table, List.of(record), null);
+         }
+      }
+
       for(Map.Entry<String, QFieldMetaData> entry : fields.entrySet())
       {
          String         fieldName = entry.getKey();

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/actions/values/ValueBehaviorApplier.java

@@ -27,6 +27,7 @@ import java.util.Set;
 import com.kingsrook.qqq.backend.core.model.data.QRecord;
 import com.kingsrook.qqq.backend.core.model.metadata.QInstance;
 import com.kingsrook.qqq.backend.core.model.metadata.fields.FieldBehavior;
+import com.kingsrook.qqq.backend.core.model.metadata.fields.FieldDisplayBehavior;
 import com.kingsrook.qqq.backend.core.model.metadata.fields.QFieldMetaData;
 import com.kingsrook.qqq.backend.core.model.metadata.tables.QTableMetaData;
 import com.kingsrook.qqq.backend.core.utils.CollectionUtils;
@@ -44,7 +45,8 @@ public class ValueBehaviorApplier
    public enum Action
    {
       INSERT,
-      UPDATE
+      UPDATE,
+      FORMATTING
    }
 
 
@@ -63,7 +65,34 @@ public class ValueBehaviorApplier
       {
          for(FieldBehavior<?> fieldBehavior : CollectionUtils.nonNullCollection(field.getBehaviors()))
          {
-            fieldBehavior.apply(action, recordList, instance, table, field, behaviorsToOmit);
+            boolean applyBehavior = true;
+            if(behaviorsToOmit != null && behaviorsToOmit.contains(fieldBehavior))
+            {
+               /////////////////////////////////////////////////////////////////////////////////////////
+               // if we're given a set of behaviors to omit, and this behavior is in there, then skip //
+               /////////////////////////////////////////////////////////////////////////////////////////
+               applyBehavior = false;
+            }
+
+            if(Action.FORMATTING == action && !(fieldBehavior instanceof FieldDisplayBehavior<?>))
+            {
+               ////////////////////////////////////////////////////////////////////////////////////////////////
+               // for the formatting action, do not apply the behavior unless it is a field-display-behavior //
+               ////////////////////////////////////////////////////////////////////////////////////////////////
+               applyBehavior = false;
+            }
+            else if(Action.FORMATTING != action && fieldBehavior instanceof FieldDisplayBehavior<?>)
+            {
+               /////////////////////////////////////////////////////////////////////////////////////////////
+               // for non-formatting actions, do not apply the behavior IF it is a field-display-behavior //
+               /////////////////////////////////////////////////////////////////////////////////////////////
+               applyBehavior = false;
+            }
+
+            if(applyBehavior)
+            {
+               fieldBehavior.apply(action, recordList, instance, table, field);
+            }
          }
       }
    }

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/instances/QInstanceValidator.java

@@ -64,6 +64,7 @@ import com.kingsrook.qqq.backend.core.model.metadata.dashboard.ParentWidgetMetaD
 import com.kingsrook.qqq.backend.core.model.metadata.dashboard.QWidgetMetaDataInterface;
 import com.kingsrook.qqq.backend.core.model.metadata.fields.AdornmentType;
 import com.kingsrook.qqq.backend.core.model.metadata.fields.FieldAdornment;
+import com.kingsrook.qqq.backend.core.model.metadata.fields.FieldBehavior;
 import com.kingsrook.qqq.backend.core.model.metadata.fields.QFieldMetaData;
 import com.kingsrook.qqq.backend.core.model.metadata.fields.ValueTooLongBehavior;
 import com.kingsrook.qqq.backend.core.model.metadata.joins.JoinOn;
@@ -810,7 +811,7 @@ public class QInstanceValidator
    /*******************************************************************************
     **
     *******************************************************************************/
-   private void validateTableField(QInstance qInstance, String tableName, String fieldName, QTableMetaData table, QFieldMetaData field)
+   private <T extends FieldBehavior<T>> void validateTableField(QInstance qInstance, String tableName, String fieldName, QTableMetaData table, QFieldMetaData field)
    {
       assertCondition(Objects.equals(fieldName, field.getName()),
          "Inconsistent naming in table " + tableName + " for field " + fieldName + "/" + field.getName() + ".");
@@ -823,12 +824,32 @@ public class QInstanceValidator
 
       String prefix = "Field " + fieldName + " in table " + tableName + " ";
 
+      ///////////////////////////////////////////////////
+      // validate things we know about field behaviors //
+      ///////////////////////////////////////////////////
       ValueTooLongBehavior behavior = field.getBehaviorOrDefault(qInstance, ValueTooLongBehavior.class);
       if(behavior != null && !behavior.equals(ValueTooLongBehavior.PASS_THROUGH))
       {
          assertCondition(field.getMaxLength() != null, prefix + "specifies a ValueTooLongBehavior, but not a maxLength.");
       }
 
+      Set<Class<FieldBehavior<T>>> usedFieldBehaviorTypes = new HashSet<>();
+      if(field.getBehaviors() != null)
+      {
+         for(FieldBehavior<?> fieldBehavior : field.getBehaviors())
+         {
+            Class<FieldBehavior<T>> behaviorClass = (Class<FieldBehavior<T>>) fieldBehavior.getClass();
+
+            errors.addAll(fieldBehavior.validateBehaviorConfiguration(table, field));
+
+            if(!fieldBehavior.allowMultipleBehaviorsOfThisType())
+            {
+               assertCondition(!usedFieldBehaviorTypes.contains(behaviorClass), prefix + "has more than 1 fieldBehavior of type " + behaviorClass.getSimpleName() + ", which is not allowed for this type");
+            }
+            usedFieldBehaviorTypes.add(behaviorClass);
+         }
+      }
+
       if(field.getMaxLength() != null)
       {
          assertCondition(field.getMaxLength() > 0, prefix + "has an invalid maxLength (" + field.getMaxLength() + ") - must be greater than 0.");

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/model/actions/AbstractActionInput.java

@@ -26,6 +26,7 @@ import java.util.UUID;
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.kingsrook.qqq.backend.core.actions.async.AsyncJobCallback;
 import com.kingsrook.qqq.backend.core.actions.async.AsyncJobStatus;
+import com.kingsrook.qqq.backend.core.actions.async.NonPersistedAsyncJobCallback;
 import com.kingsrook.qqq.backend.core.context.QContext;
 import com.kingsrook.qqq.backend.core.exceptions.QInstanceValidationException;
 import com.kingsrook.qqq.backend.core.instances.QInstanceValidator;
@@ -139,7 +140,7 @@ public class AbstractActionInput
          ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
          // don't return null here (too easy to NPE).  instead, if someone wants one of these, create one and give it to them. //
          ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-         asyncJobCallback = new AsyncJobCallback(UUID.randomUUID(), new AsyncJobStatus());
+         asyncJobCallback = new NonPersistedAsyncJobCallback(UUID.randomUUID(), new AsyncJobStatus().withJobName(getClass().getSimpleName()));
       }
       return asyncJobCallback;
    }

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/model/actions/processes/RunBackendStepInput.java

@@ -30,6 +30,7 @@ import java.util.Map;
 import java.util.UUID;
 import com.kingsrook.qqq.backend.core.actions.async.AsyncJobCallback;
 import com.kingsrook.qqq.backend.core.actions.async.AsyncJobStatus;
+import com.kingsrook.qqq.backend.core.actions.async.NonPersistedAsyncJobCallback;
 import com.kingsrook.qqq.backend.core.actions.processes.QProcessCallback;
 import com.kingsrook.qqq.backend.core.context.QContext;
 import com.kingsrook.qqq.backend.core.model.actions.AbstractActionInput;
@@ -450,7 +451,7 @@ public class RunBackendStepInput extends AbstractActionInput
          /////////////////////////////////////////////////////////////////////////
          // avoid NPE in case we didn't have one of these!  create a new one... //
          /////////////////////////////////////////////////////////////////////////
-         asyncJobCallback = new AsyncJobCallback(UUID.randomUUID(), new AsyncJobStatus());
+         asyncJobCallback = new NonPersistedAsyncJobCallback(UUID.randomUUID(), new AsyncJobStatus().withJobName(processName + "." + stepName));
       }
       return (asyncJobCallback);
    }

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/model/dashboard/widgets/FieldValueListData.java

@@ -27,6 +27,7 @@ import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.stream.Collectors;
 import com.kingsrook.qqq.backend.core.actions.values.QValueFormatter;
 import com.kingsrook.qqq.backend.core.instances.QInstanceEnricher;
 import com.kingsrook.qqq.backend.core.model.data.QRecord;
@@ -147,7 +148,7 @@ public class FieldValueListData extends QWidgetData
          }
       }
 
-      QValueFormatter.setDisplayValuesInRecord(fields, record);
+      QValueFormatter.setDisplayValuesInRecord(null, fields.stream().collect(Collectors.toMap(f -> f.getName(), f -> f)), record);
    }
 
 

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/model/metadata/fields/DateTimeDisplayValueBehavior.java

@@ -0,0 +1,331 @@
+/*
+ * QQQ - Low-code Application Framework for Engineers.
+ * Copyright (C) 2021-2024.  Kingsrook, LLC
+ * 651 N Broad St Ste 205 # 6917 | Middletown DE 19709 | United States
+ * contact@kingsrook.com
+ * https://github.com/Kingsrook/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.kingsrook.qqq.backend.core.model.metadata.fields;
+
+
+import java.time.Instant;
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+import java.util.ArrayList;
+import java.util.List;
+import com.kingsrook.qqq.backend.core.actions.values.QValueFormatter;
+import com.kingsrook.qqq.backend.core.actions.values.ValueBehaviorApplier;
+import com.kingsrook.qqq.backend.core.logging.QLogger;
+import com.kingsrook.qqq.backend.core.model.data.QRecord;
+import com.kingsrook.qqq.backend.core.model.metadata.QInstance;
+import com.kingsrook.qqq.backend.core.model.metadata.tables.QTableMetaData;
+import com.kingsrook.qqq.backend.core.utils.CollectionUtils;
+import com.kingsrook.qqq.backend.core.utils.StringUtils;
+import static com.kingsrook.qqq.backend.core.logging.LogUtils.logPair;
+
+
+/*******************************************************************************
+ ** Field Display Behavior class for customizing the display values used
+ ** in date-time fields
+ *******************************************************************************/
+public class DateTimeDisplayValueBehavior implements FieldDisplayBehavior<DateTimeDisplayValueBehavior>
+{
+   private static final QLogger LOG = QLogger.getLogger(DateTimeDisplayValueBehavior.class);
+
+   private String zoneIdFromFieldName;
+   private String fallbackZoneId;
+
+   private String defaultZoneId;
+
+   private static DateTimeDisplayValueBehavior NOOP = new DateTimeDisplayValueBehavior();
+
+
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   @Override
+   public DateTimeDisplayValueBehavior getDefault()
+   {
+      return NOOP;
+   }
+
+
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   @Override
+   public void apply(ValueBehaviorApplier.Action action, List<QRecord> recordList, QInstance instance, QTableMetaData table, QFieldMetaData field)
+   {
+      if(StringUtils.hasContent(defaultZoneId))
+      {
+         applyDefaultZoneId(recordList, table, field);
+      }
+      else if(StringUtils.hasContent(zoneIdFromFieldName))
+      {
+         applyZoneIdFromFieldName(recordList, table, field);
+      }
+   }
+
+
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   private void applyDefaultZoneId(List<QRecord> recordList, QTableMetaData table, QFieldMetaData field)
+   {
+      for(QRecord record : CollectionUtils.nonNullList(recordList))
+      {
+         try
+         {
+            Instant       instant       = record.getValueInstant(field.getName());
+            ZonedDateTime zonedDateTime = instant.atZone(ZoneId.of(defaultZoneId));
+            record.setDisplayValue(field.getName(), QValueFormatter.formatDateTimeWithZone(zonedDateTime));
+         }
+         catch(Exception e)
+         {
+            LOG.info("Error applying defaultZoneId DateTimeDisplayValueBehavior", logPair("table", table.getName()), logPair("field", field.getName()), logPair("id", record.getValue(table.getPrimaryKeyField())));
+         }
+      }
+   }
+
+
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   private void applyZoneIdFromFieldName(List<QRecord> recordList, QTableMetaData table, QFieldMetaData field)
+   {
+      for(QRecord record : CollectionUtils.nonNullList(recordList))
+      {
+         try
+         {
+            Instant instant    = record.getValueInstant(field.getName());
+            String  zoneString = record.getValueString(zoneIdFromFieldName);
+
+            ZoneId zoneId;
+            try
+            {
+               zoneId = ZoneId.of(zoneString);
+            }
+            catch(Exception e)
+            {
+               ////////////////////////////////////////////////////////////////////////////////////////////////
+               // if the zone string from the other field isn't valid, and we have a fallback, try to use it //
+               ////////////////////////////////////////////////////////////////////////////////////////////////
+               if(StringUtils.hasContent(fallbackZoneId))
+               {
+                  zoneId = ZoneId.of(fallbackZoneId);
+               }
+               else
+               {
+                  throw (e);
+               }
+            }
+
+            ZonedDateTime zonedDateTime = instant.atZone(zoneId);
+            record.setDisplayValue(field.getName(), QValueFormatter.formatDateTimeWithZone(zonedDateTime));
+         }
+         catch(Exception e)
+         {
+            LOG.info("Error applying zoneIdFromFieldName DateTimeDisplayValueBehavior", e, logPair("table", table.getName()), logPair("field", field.getName()), logPair("id", record.getValue(table.getPrimaryKeyField())));
+         }
+      }
+   }
+
+
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   @Override
+   public List<String> validateBehaviorConfiguration(QTableMetaData tableMetaData, QFieldMetaData fieldMetaData)
+   {
+      List<String> errors      = new ArrayList<>();
+      String       errorSuffix = " field [" + fieldMetaData.getName() + "] in table [" + tableMetaData.getName() + "]";
+
+      if(!QFieldType.DATE_TIME.equals(fieldMetaData.getType()))
+      {
+         errors.add("A DateTimeDisplayValueBehavior was a applied to a non-DATE_TIME" + errorSuffix);
+      }
+
+      //////////////////////////////////////////////////
+      // validate rules if zoneIdFromFieldName is set //
+      //////////////////////////////////////////////////
+      if(StringUtils.hasContent(zoneIdFromFieldName))
+      {
+         if(StringUtils.hasContent(defaultZoneId))
+         {
+            errors.add("You may not specify both zoneIdFromFieldName and defaultZoneId in DateTimeDisplayValueBehavior on" + errorSuffix);
+         }
+
+         if(!tableMetaData.getFields().containsKey(zoneIdFromFieldName))
+         {
+            errors.add("Unrecognized field name [" + zoneIdFromFieldName + "] for [zoneIdFromFieldName] in DateTimeDisplayValueBehavior on" + errorSuffix);
+         }
+         else
+         {
+            QFieldMetaData zoneIdField = tableMetaData.getFields().get(zoneIdFromFieldName);
+            if(!QFieldType.STRING.equals(zoneIdField.getType()))
+            {
+               errors.add("A non-STRING type [" + zoneIdField.getType() + "] was specified as the zoneIdFromFieldName field [" + zoneIdFromFieldName + "] in DateTimeDisplayValueBehavior on" + errorSuffix);
+            }
+         }
+      }
+
+      ////////////////////////////////////////////
+      // validate rules if defaultZoneId is set //
+      ////////////////////////////////////////////
+      if(StringUtils.hasContent(defaultZoneId))
+      {
+         /////////////////////////////////////////////////////////////////////////////////////////////
+         // would check that you didn't specify from zoneIdFromFieldName - but that's covered above //
+         /////////////////////////////////////////////////////////////////////////////////////////////
+
+         if(StringUtils.hasContent(fallbackZoneId))
+         {
+            errors.add("You may not specify both defaultZoneId and fallbackZoneId in DateTimeDisplayValueBehavior on" + errorSuffix);
+         }
+
+         try
+         {
+            ZoneId.of(defaultZoneId);
+         }
+         catch(Exception e)
+         {
+            errors.add("Invalid ZoneId [" + defaultZoneId + "] for [defaultZoneId] in DateTimeDisplayValueBehavior on" + errorSuffix + "; " + e.getMessage());
+         }
+      }
+
+      /////////////////////////////////////////////
+      // validate rules if fallbackZoneId is set //
+      /////////////////////////////////////////////
+      if(StringUtils.hasContent(fallbackZoneId))
+      {
+         if(!StringUtils.hasContent(zoneIdFromFieldName))
+         {
+            errors.add("You may only set fallbackZoneId if using zoneIdFromFieldName in DateTimeDisplayValueBehavior on" + errorSuffix);
+         }
+
+         try
+         {
+            ZoneId.of(fallbackZoneId);
+         }
+         catch(Exception e)
+         {
+            errors.add("Invalid ZoneId [" + fallbackZoneId + "] for [fallbackZoneId] in DateTimeDisplayValueBehavior on" + errorSuffix + "; " + e.getMessage());
+         }
+      }
+
+      return (errors);
+   }
+
+
+
+   /*******************************************************************************
+    ** Getter for zoneIdFromFieldName
+    *******************************************************************************/
+   public String getZoneIdFromFieldName()
+   {
+      return (this.zoneIdFromFieldName);
+   }
+
+
+
+   /*******************************************************************************
+    ** Setter for zoneIdFromFieldName
+    *******************************************************************************/
+   public void setZoneIdFromFieldName(String zoneIdFromFieldName)
+   {
+      this.zoneIdFromFieldName = zoneIdFromFieldName;
+   }
+
+
+
+   /*******************************************************************************
+    ** Fluent setter for zoneIdFromFieldName
+    *******************************************************************************/
+   public DateTimeDisplayValueBehavior withZoneIdFromFieldName(String zoneIdFromFieldName)
+   {
+      this.zoneIdFromFieldName = zoneIdFromFieldName;
+      return (this);
+   }
+
+
+
+   /*******************************************************************************
+    ** Getter for defaultZoneId
+    *******************************************************************************/
+   public String getDefaultZoneId()
+   {
+      return (this.defaultZoneId);
+   }
+
+
+
+   /*******************************************************************************
+    ** Setter for defaultZoneId
+    *******************************************************************************/
+   public void setDefaultZoneId(String defaultZoneId)
+   {
+      this.defaultZoneId = defaultZoneId;
+   }
+
+
+
+   /*******************************************************************************
+    ** Fluent setter for defaultZoneId
+    *******************************************************************************/
+   public DateTimeDisplayValueBehavior withDefaultZoneId(String defaultZoneId)
+   {
+      this.defaultZoneId = defaultZoneId;
+      return (this);
+   }
+
+
+
+   /*******************************************************************************
+    ** Getter for fallbackZoneId
+    *******************************************************************************/
+   public String getFallbackZoneId()
+   {
+      return (this.fallbackZoneId);
+   }
+
+
+
+   /*******************************************************************************
+    ** Setter for fallbackZoneId
+    *******************************************************************************/
+   public void setFallbackZoneId(String fallbackZoneId)
+   {
+      this.fallbackZoneId = fallbackZoneId;
+   }
+
+
+
+   /*******************************************************************************
+    ** Fluent setter for fallbackZoneId
+    *******************************************************************************/
+   public DateTimeDisplayValueBehavior withFallbackZoneId(String fallbackZoneId)
+   {
+      this.fallbackZoneId = fallbackZoneId;
+      return (this);
+   }
+
+}

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/model/metadata/fields/DynamicDefaultValueBehavior.java

@@ -1,6 +1,6 @@
 /*
  * QQQ - Low-code Application Framework for Engineers.
- * Copyright (C) 2021-2022.  Kingsrook, LLC
+ * Copyright (C) 2021-2024.  Kingsrook, LLC
  * 651 N Broad St Ste 205 # 6917 | Middletown DE 19709 | United States
  * contact@kingsrook.com
  * https://github.com/Kingsrook/
@@ -26,7 +26,6 @@ import java.io.Serializable;
 import java.time.Instant;
 import java.time.LocalDate;
 import java.util.List;
-import java.util.Set;
 import com.kingsrook.qqq.backend.core.actions.values.ValueBehaviorApplier;
 import com.kingsrook.qqq.backend.core.context.QContext;
 import com.kingsrook.qqq.backend.core.logging.QLogger;
@@ -70,16 +69,12 @@ public enum DynamicDefaultValueBehavior implements FieldBehavior<DynamicDefaultV
     **
     *******************************************************************************/
    @Override
-   public void apply(ValueBehaviorApplier.Action action, List<QRecord> recordList, QInstance instance, QTableMetaData table, QFieldMetaData field, Set<FieldBehavior<?>> behaviorsToOmit)
+   public void apply(ValueBehaviorApplier.Action action, List<QRecord> recordList, QInstance instance, QTableMetaData table, QFieldMetaData field)
    {
       if(this.equals(NONE))
       {
          return;
       }
-      if(behaviorsToOmit != null && behaviorsToOmit.contains(this))
-      {
-         return;
-      }
 
       switch(this)
       {

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/model/metadata/fields/FieldBehavior.java

@@ -1,6 +1,6 @@
 /*
  * QQQ - Low-code Application Framework for Engineers.
- * Copyright (C) 2021-2022.  Kingsrook, LLC
+ * Copyright (C) 2021-2024.  Kingsrook, LLC
  * 651 N Broad St Ste 205 # 6917 | Middletown DE 19709 | United States
  * contact@kingsrook.com
  * https://github.com/Kingsrook/
@@ -22,8 +22,9 @@
 package com.kingsrook.qqq.backend.core.model.metadata.fields;
 
 
+import java.util.Collections;
 import java.util.List;
-import java.util.Set;
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.kingsrook.qqq.backend.core.actions.values.ValueBehaviorApplier;
 import com.kingsrook.qqq.backend.core.model.data.QRecord;
 import com.kingsrook.qqq.backend.core.model.metadata.QInstance;
@@ -34,8 +35,10 @@ import com.kingsrook.qqq.backend.core.model.metadata.tables.QTableMetaData;
  ** Interface for (expected to be?) enums which define behaviors that get applied
  ** to fields.
  **
- ** At the present, these behaviors get applied before a field is stored (insert
+ ** Some of these behaviors get applied before a field is stored (insert
- ** or update), through the ValueBehaviorApplier class.
+ ** or update), through the ValueBehaviorApplier class.  Others can be used to
+ ** do more advanced display formatting than the displayFormat string alone can
+ ** do (see QValueFormatter).
  **
  *******************************************************************************/
 public interface FieldBehavior<T extends FieldBehavior<T>>
@@ -45,12 +48,13 @@ public interface FieldBehavior<T extends FieldBehavior<T>>
     ** In case a behavior of this type wasn't set on the field, what should the
     ** default of this type be?
     *******************************************************************************/
+   @JsonIgnore
    T getDefault();
 
    /*******************************************************************************
     ** Apply this behavior to a list of records
     *******************************************************************************/
-   void apply(ValueBehaviorApplier.Action action, List<QRecord> recordList, QInstance instance, QTableMetaData table, QFieldMetaData field, Set<FieldBehavior<?>> behaviorsToOmit);
+   void apply(ValueBehaviorApplier.Action action, List<QRecord> recordList, QInstance instance, QTableMetaData table, QFieldMetaData field);
 
    /*******************************************************************************
     ** control if multiple behaviors of this type should be allowed together on a field.
@@ -60,4 +64,14 @@ public interface FieldBehavior<T extends FieldBehavior<T>>
       return (false);
    }
 
+   /*******************************************************************************
+    ** allow this behavior to be validated during QInstance validation.
+    **
+    ** return a list of validation errors, if there are any.
+    *******************************************************************************/
+   default List<String> validateBehaviorConfiguration(QTableMetaData tableMetaData, QFieldMetaData fieldMetaData)
+   {
+      return (Collections.emptyList());
+   }
+
 }

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/model/metadata/fields/FieldDisplayBehavior.java

@@ -0,0 +1,31 @@
+/*
+ * QQQ - Low-code Application Framework for Engineers.
+ * Copyright (C) 2021-2024.  Kingsrook, LLC
+ * 651 N Broad St Ste 205 # 6917 | Middletown DE 19709 | United States
+ * contact@kingsrook.com
+ * https://github.com/Kingsrook/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.kingsrook.qqq.backend.core.model.metadata.fields;
+
+
+/*******************************************************************************
+ **
+ *******************************************************************************/
+public interface FieldDisplayBehavior<T extends FieldDisplayBehavior<T>> extends FieldBehavior<T>
+{
+
+}

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/model/metadata/fields/QFieldMetaData.java

@@ -721,6 +721,17 @@ public class QFieldMetaData implements Cloneable
       {
          return (behaviorType.getEnumConstants()[0].getDefault());
       }
+      else
+      {
+         try
+         {
+            return (behaviorType.getConstructor().newInstance().getDefault());
+         }
+         catch(Exception e)
+         {
+            LOG.warn("Error getting default behaviorType for [" + behaviorType.getSimpleName() + "]", e);
+         }
+      }
 
       return (null);
    }

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/model/metadata/fields/ValueTooLongBehavior.java

@@ -1,6 +1,6 @@
 /*
  * QQQ - Low-code Application Framework for Engineers.
- * Copyright (C) 2021-2022.  Kingsrook, LLC
+ * Copyright (C) 2021-2024.  Kingsrook, LLC
  * 651 N Broad St Ste 205 # 6917 | Middletown DE 19709 | United States
  * contact@kingsrook.com
  * https://github.com/Kingsrook/
@@ -23,7 +23,6 @@ package com.kingsrook.qqq.backend.core.model.metadata.fields;
 
 
 import java.util.List;
-import java.util.Set;
 import com.kingsrook.qqq.backend.core.actions.values.ValueBehaviorApplier;
 import com.kingsrook.qqq.backend.core.logging.QLogger;
 import com.kingsrook.qqq.backend.core.model.data.QRecord;
@@ -66,16 +65,12 @@ public enum ValueTooLongBehavior implements FieldBehavior<ValueTooLongBehavior>
     **
     *******************************************************************************/
    @Override
-   public void apply(ValueBehaviorApplier.Action action, List<QRecord> recordList, QInstance instance, QTableMetaData table, QFieldMetaData field, Set<FieldBehavior<?>> behaviorsToOmit)
+   public void apply(ValueBehaviorApplier.Action action, List<QRecord> recordList, QInstance instance, QTableMetaData table, QFieldMetaData field)
    {
       if(this.equals(PASS_THROUGH))
       {
          return;
       }
-      if(behaviorsToOmit != null && behaviorsToOmit.contains(this))
-      {
-         return;
-      }
 
       String fieldName = field.getName();
       if(!QFieldType.STRING.equals(field.getType()))

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/processes/implementations/columnstats/ColumnStatsStep.java

@@ -34,6 +34,7 @@ import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
+import java.util.stream.Collectors;
 import com.kingsrook.qqq.backend.core.actions.dashboard.widgets.DateTimeGroupBy;
 import com.kingsrook.qqq.backend.core.actions.permissions.PermissionsHelper;
 import com.kingsrook.qqq.backend.core.actions.permissions.TablePermissionSubType;
@@ -252,7 +253,7 @@ public class ColumnStatsStep implements BackendStep
 
          QPossibleValueTranslator qPossibleValueTranslator = new QPossibleValueTranslator();
          qPossibleValueTranslator.translatePossibleValuesInRecords(table, valueCounts, queryJoin == null ? null : List.of(queryJoin), null);
-         QValueFormatter.setDisplayValuesInRecords(Map.of(fieldName, field, "count", countField), valueCounts);
+         QValueFormatter.setDisplayValuesInRecords(table, Map.of(fieldName, field, "count", countField), valueCounts);
 
          runBackendStepOutput.addValue("valueCounts", valueCounts);
 
@@ -442,13 +443,13 @@ public class ColumnStatsStep implements BackendStep
             }
 
             QFieldMetaData percentField = new QFieldMetaData("percent", QFieldType.DECIMAL).withDisplayFormat(DisplayFormat.PERCENT_POINT2).withLabel("Percent");
-            QValueFormatter.setDisplayValuesInRecords(Map.of(fieldName, field, "percent", percentField), valueCounts);
+            QValueFormatter.setDisplayValuesInRecords(table, Map.of(fieldName, field, "percent", percentField), valueCounts);
          }
 
          QInstanceEnricher qInstanceEnricher = new QInstanceEnricher(null);
          fields.forEach(qInstanceEnricher::enrichField);
 
-         QValueFormatter.setDisplayValuesInRecord(fields, statsRecord);
+         QValueFormatter.setDisplayValuesInRecord(table, fields.stream().collect(Collectors.toMap(f -> f.getName(), f -> f)), statsRecord);
 
          runBackendStepOutput.addValue("statsFields", fields);
          runBackendStepOutput.addValue("statsRecord", statsRecord);

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/state/InMemoryStateProvider.java

@@ -46,8 +46,9 @@ public class InMemoryStateProvider implements StateProviderInterface
 
    private final Map<AbstractStateKey, Object> map;
 
-   private int jobPeriodSeconds = 60 * 15;
+   private static int jobPeriodSeconds = 60 * 60; // 1 hour
-   private int jobInitialDelay  = 60 * 60 * 4;
+   private static int cleanHours       = 6;
+   private static int jobInitialDelay  = 60 * 60 * cleanHours;
 
 
 
@@ -84,7 +85,7 @@ public class InMemoryStateProvider implements StateProviderInterface
       {
          try
          {
-            Instant cleanTime = Instant.now().minus(4, ChronoUnit.HOURS);
+            Instant cleanTime = Instant.now().minus(cleanHours, ChronoUnit.HOURS);
             getInstance().clean(cleanTime);
          }
          catch(Exception e)

qqq-backend-core/src/test/java/com/kingsrook/qqq/backend/core/actions/values/QValueFormatterTest.java

@@ -23,6 +23,7 @@ package com.kingsrook.qqq.backend.core.actions.values;
 
 
 import java.math.BigDecimal;
+import java.time.Instant;
 import java.time.LocalDate;
 import java.time.LocalDateTime;
 import java.time.LocalTime;
@@ -32,10 +33,13 @@ import java.time.ZonedDateTime;
 import java.util.Collections;
 import java.util.List;
 import com.kingsrook.qqq.backend.core.BaseTest;
+import com.kingsrook.qqq.backend.core.context.QContext;
 import com.kingsrook.qqq.backend.core.model.data.QRecord;
+import com.kingsrook.qqq.backend.core.model.metadata.QInstance;
 import com.kingsrook.qqq.backend.core.model.metadata.fields.DisplayFormat;
 import com.kingsrook.qqq.backend.core.model.metadata.fields.QFieldMetaData;
 import com.kingsrook.qqq.backend.core.model.metadata.fields.QFieldType;
+import com.kingsrook.qqq.backend.core.model.metadata.fields.DateTimeDisplayValueBehavior;
 import com.kingsrook.qqq.backend.core.model.metadata.tables.QTableMetaData;
 import com.kingsrook.qqq.backend.core.utils.TestUtils;
 import org.junit.jupiter.api.Test;
@@ -210,4 +214,23 @@ class QValueFormatterTest extends BaseTest
       assertEquals("2023-02-01 07:15:47 PM CST", QValueFormatter.formatDateTimeWithZone(ZonedDateTime.of(LocalDateTime.of(2023, Month.FEBRUARY, 1, 19, 15, 47), ZoneId.of("US/Central"))));
    }
 
+
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   @Test
+   void testFieldDisplayBehaviors()
+   {
+      QInstance      qInstance = QContext.getQInstance();
+      QTableMetaData table     = qInstance.getTable(TestUtils.TABLE_NAME_PERSON_MEMORY);
+
+      table.withField(new QFieldMetaData("timeZone", QFieldType.STRING));
+      table.getField("createDate").withBehavior(new DateTimeDisplayValueBehavior().withZoneIdFromFieldName("timeZone"));
+
+      QRecord record = new QRecord().withValue("createDate", Instant.parse("2024-04-04T19:12:00Z")).withValue("timeZone", "America/Chicago");
+      QValueFormatter.setDisplayValuesInRecords(table, List.of(record));
+      assertEquals("2024-04-04 02:12:00 PM CDT", record.getDisplayValue("createDate"));
+   }
+
 }

qqq-backend-core/src/test/java/com/kingsrook/qqq/backend/core/actions/values/ValueBehaviorApplierTest.java

@@ -29,9 +29,12 @@ import com.kingsrook.qqq.backend.core.BaseTest;
 import com.kingsrook.qqq.backend.core.context.QContext;
 import com.kingsrook.qqq.backend.core.model.data.QRecord;
 import com.kingsrook.qqq.backend.core.model.metadata.QInstance;
+import com.kingsrook.qqq.backend.core.model.metadata.fields.QFieldMetaData;
 import com.kingsrook.qqq.backend.core.model.metadata.fields.FieldBehavior;
+import com.kingsrook.qqq.backend.core.model.metadata.fields.FieldDisplayBehavior;
 import com.kingsrook.qqq.backend.core.model.metadata.fields.ValueTooLongBehavior;
 import com.kingsrook.qqq.backend.core.model.metadata.tables.QTableMetaData;
+import com.kingsrook.qqq.backend.core.utils.CollectionUtils;
 import com.kingsrook.qqq.backend.core.utils.TestUtils;
 import org.junit.jupiter.api.Test;
 import static org.junit.jupiter.api.Assertions.assertEquals;
@@ -140,6 +143,36 @@ class ValueBehaviorApplierTest extends BaseTest
 
 
 
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   @Test
+   void testApplyFormattingBehaviors()
+   {
+      QInstance      qInstance = QContext.getQInstance();
+      QTableMetaData table     = qInstance.getTable(TestUtils.TABLE_NAME_PERSON_MEMORY);
+
+      table.getField("firstName").withBehavior(ToUpperCaseBehavior.getInstance());
+      table.getField("lastName").withBehavior(ToUpperCaseBehavior.NOOP);
+      table.getField("ssn").withBehavior(ValueTooLongBehavior.TRUNCATE).withMaxLength(1);
+
+      QRecord record = new QRecord().withValue("firstName", "Homer").withValue("lastName", "Simpson").withValue("ssn", "0123456789");
+      ValueBehaviorApplier.applyFieldBehaviors(ValueBehaviorApplier.Action.FORMATTING, qInstance, table, List.of(record), null);
+      
+      assertEquals("HOMER", record.getDisplayValue("firstName"));
+      assertNull(record.getDisplayValue("lastName")); // noop will literally do nothing, not even pass value through.
+      assertEquals("0123456789", record.getValueString("ssn")); // formatting action should not run the too-long truncate behavior
+
+      ////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+      // now put to-upper-case behavior on lastName, but run INSERT actions - and make sure it doesn't get applied. //
+      ////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+      table.getField("lastName").withBehavior(ToUpperCaseBehavior.getInstance());
+      ValueBehaviorApplier.applyFieldBehaviors(ValueBehaviorApplier.Action.INSERT, qInstance, table, List.of(record), null);
+      assertNull(record.getDisplayValue("lastName"));
+   }
+
+
+
    /*******************************************************************************
     **
     *******************************************************************************/
@@ -153,4 +186,73 @@ class ValueBehaviorApplierTest extends BaseTest
       return (recordOpt.get());
    }
 
+
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   public static class ToUpperCaseBehavior implements FieldDisplayBehavior<ToUpperCaseBehavior>
+   {
+      private final boolean enabled;
+
+      private static ToUpperCaseBehavior NOOP     = new ToUpperCaseBehavior(false);
+      private static ToUpperCaseBehavior instance = new ToUpperCaseBehavior(true);
+
+
+
+      /*******************************************************************************
+       ** Constructor
+       **
+       *******************************************************************************/
+      private ToUpperCaseBehavior(boolean enabled)
+      {
+         this.enabled = enabled;
+      }
+
+
+
+      /*******************************************************************************
+       **
+       *******************************************************************************/
+      @Override
+      public ToUpperCaseBehavior getDefault()
+      {
+         return (NOOP);
+      }
+
+
+
+      /*******************************************************************************
+       **
+       *******************************************************************************/
+      public static ToUpperCaseBehavior getInstance()
+      {
+         return (instance);
+      }
+
+
+
+      /*******************************************************************************
+       **
+       *******************************************************************************/
+      @Override
+      public void apply(ValueBehaviorApplier.Action action, List<QRecord> recordList, QInstance instance, QTableMetaData table, QFieldMetaData field)
+      {
+         if(!enabled)
+         {
+            return;
+         }
+
+         for(QRecord record : CollectionUtils.nonNullList(recordList))
+         {
+            String displayValue = record.getValueString(field.getName());
+            if(displayValue != null)
+            {
+               displayValue = displayValue.toUpperCase();
+            }
+
+            record.setDisplayValue(field.getName(), displayValue);
+         }
+      }
+   }
 }

qqq-backend-core/src/test/java/com/kingsrook/qqq/backend/core/instances/QInstanceValidatorTest.java

@@ -26,6 +26,8 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Set;
+import java.util.function.BiFunction;
 import java.util.function.Consumer;
 import java.util.function.Function;
 import java.util.function.Supplier;
@@ -56,6 +58,7 @@ import com.kingsrook.qqq.backend.core.model.metadata.fields.AdornmentType;
 import com.kingsrook.qqq.backend.core.model.metadata.fields.FieldAdornment;
 import com.kingsrook.qqq.backend.core.model.metadata.fields.QFieldMetaData;
 import com.kingsrook.qqq.backend.core.model.metadata.fields.QFieldType;
+import com.kingsrook.qqq.backend.core.model.metadata.fields.DateTimeDisplayValueBehavior;
 import com.kingsrook.qqq.backend.core.model.metadata.fields.ValueTooLongBehavior;
 import com.kingsrook.qqq.backend.core.model.metadata.joins.JoinOn;
 import com.kingsrook.qqq.backend.core.model.metadata.joins.JoinType;
@@ -1758,6 +1761,26 @@ public class QInstanceValidatorTest extends BaseTest
 
 
 
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   @Test
+   void testFieldBehaviors()
+   {
+      BiFunction<QInstance, String, QFieldMetaData> fieldExtractor = (QInstance qInstance, String fieldName) -> qInstance.getTable(TestUtils.TABLE_NAME_PERSON).getField(fieldName);
+      assertValidationFailureReasons((qInstance -> fieldExtractor.apply(qInstance, "firstName").withBehaviors(Set.of(ValueTooLongBehavior.ERROR, ValueTooLongBehavior.TRUNCATE)).withMaxLength(1)),
+         "more than 1 fieldBehavior of type ValueTooLongBehavior, which is not allowed");
+
+      ///////////////////////////////////////////////////////////////////////////
+      // make sure a custom validation method in a field behavior gets applied //
+      // more tests for this particular behavior are in its own test class     //
+      ///////////////////////////////////////////////////////////////////////////
+      assertValidationFailureReasons((qInstance -> fieldExtractor.apply(qInstance, "firstName").withBehavior(new DateTimeDisplayValueBehavior())),
+         "DateTimeDisplayValueBehavior was a applied to a non-DATE_TIME field");
+   }
+
+
+
    /*******************************************************************************
     **
     *******************************************************************************/

qqq-backend-core/src/test/java/com/kingsrook/qqq/backend/core/model/metadata/fields/DateTimeDisplayValueBehaviorTest.java

@@ -0,0 +1,169 @@
+/*
+ * QQQ - Low-code Application Framework for Engineers.
+ * Copyright (C) 2021-2024.  Kingsrook, LLC
+ * 651 N Broad St Ste 205 # 6917 | Middletown DE 19709 | United States
+ * contact@kingsrook.com
+ * https://github.com/Kingsrook/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.kingsrook.qqq.backend.core.model.metadata.fields;
+
+
+import java.time.Instant;
+import java.util.List;
+import java.util.function.Consumer;
+import java.util.function.Function;
+import com.kingsrook.qqq.backend.core.BaseTest;
+import com.kingsrook.qqq.backend.core.actions.values.ValueBehaviorApplier;
+import com.kingsrook.qqq.backend.core.context.QContext;
+import com.kingsrook.qqq.backend.core.model.data.QRecord;
+import com.kingsrook.qqq.backend.core.model.metadata.QInstance;
+import com.kingsrook.qqq.backend.core.model.metadata.tables.QTableMetaData;
+import com.kingsrook.qqq.backend.core.utils.TestUtils;
+import org.junit.jupiter.api.Test;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+
+/*******************************************************************************
+ ** Unit test for DateTimeDisplayValueBehavior 
+ *******************************************************************************/
+class DateTimeDisplayValueBehaviorTest extends BaseTest
+{
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   @Test
+   void testZoneIdFromFieldName()
+   {
+      QInstance      qInstance = QContext.getQInstance();
+      QTableMetaData table     = qInstance.getTable(TestUtils.TABLE_NAME_PERSON_MEMORY);
+
+      table.withField(new QFieldMetaData("timeZone", QFieldType.STRING));
+      table.getField("createDate").withBehavior(new DateTimeDisplayValueBehavior().withZoneIdFromFieldName("timeZone"));
+
+      QRecord record = new QRecord().withValue("createDate", Instant.parse("2024-04-04T19:12:00Z")).withValue("timeZone", "America/Chicago");
+      ValueBehaviorApplier.applyFieldBehaviors(ValueBehaviorApplier.Action.FORMATTING, qInstance, table, List.of(record), null);
+      assertEquals("2024-04-04 02:12:00 PM CDT", record.getDisplayValue("createDate"));
+   }
+
+
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   @Test
+   void testZoneIdFromFieldNameWithFallback()
+   {
+      QInstance      qInstance = QContext.getQInstance();
+      QTableMetaData table     = qInstance.getTable(TestUtils.TABLE_NAME_PERSON_MEMORY);
+
+      table.withField(new QFieldMetaData("timeZone", QFieldType.STRING));
+      table.getField("createDate").withBehavior(new DateTimeDisplayValueBehavior().withZoneIdFromFieldName("timeZone").withFallbackZoneId("America/Denver"));
+
+      QRecord record = new QRecord().withValue("createDate", Instant.parse("2024-04-04T19:12:00Z")).withValue("timeZone", "whodis");
+      ValueBehaviorApplier.applyFieldBehaviors(ValueBehaviorApplier.Action.FORMATTING, qInstance, table, List.of(record), null);
+      assertEquals("2024-04-04 01:12:00 PM MDT", record.getDisplayValue("createDate"));
+   }
+
+
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   @Test
+   void testDefaultZoneId()
+   {
+      QInstance      qInstance = QContext.getQInstance();
+      QTableMetaData table     = qInstance.getTable(TestUtils.TABLE_NAME_PERSON_MEMORY);
+
+      table.withField(new QFieldMetaData("timeZone", QFieldType.STRING));
+      table.getField("createDate").withBehavior(new DateTimeDisplayValueBehavior().withDefaultZoneId("America/Los_Angeles"));
+
+      QRecord record = new QRecord().withValue("createDate", Instant.parse("2024-04-04T19:12:00Z"));
+      ValueBehaviorApplier.applyFieldBehaviors(ValueBehaviorApplier.Action.FORMATTING, qInstance, table, List.of(record), null);
+      assertEquals("2024-04-04 12:12:00 PM PDT", record.getDisplayValue("createDate"));
+   }
+
+
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   @Test
+   void testValidation()
+   {
+      QInstance      qInstance = QContext.getQInstance();
+      QTableMetaData table = qInstance.getTable(TestUtils.TABLE_NAME_PERSON_MEMORY);
+      QFieldMetaData field = table.getField("createDate");
+      table.withField(new QFieldMetaData("timeZone", QFieldType.STRING));
+
+      Function<Consumer<DateTimeDisplayValueBehavior>, List<String>> testOne = setup ->
+      {
+         DateTimeDisplayValueBehavior dateTimeDisplayValueBehavior = new DateTimeDisplayValueBehavior();
+         setup.accept(dateTimeDisplayValueBehavior);
+         return (dateTimeDisplayValueBehavior.validateBehaviorConfiguration(table, field));
+      };
+
+      ///////////////////
+      // valid configs //
+      ///////////////////
+      assertThat(testOne.apply(b -> b.toString())).isEmpty(); // default setup (noop use-case) is valid
+      assertThat(testOne.apply(b -> b.withZoneIdFromFieldName("timeZone"))).isEmpty();
+      assertThat(testOne.apply(b -> b.withZoneIdFromFieldName("timeZone").withFallbackZoneId("UTC"))).isEmpty();
+      assertThat(testOne.apply(b -> b.withZoneIdFromFieldName("timeZone").withFallbackZoneId("America/Chicago"))).isEmpty();
+      assertThat(testOne.apply(b -> b.withDefaultZoneId("UTC"))).isEmpty();
+      assertThat(testOne.apply(b -> b.withDefaultZoneId("America/Chicago"))).isEmpty();
+
+      /////////////////////
+      // invalid configs //
+      /////////////////////
+      assertThat(testOne.apply(b -> b.withZoneIdFromFieldName("notAField")))
+         .hasSize(1).first().asString()
+         .contains("Unrecognized field name");
+
+      assertThat(testOne.apply(b -> b.withZoneIdFromFieldName("id")))
+         .hasSize(1).first().asString()
+         .contains("A non-STRING type [INTEGER] was specified as the zoneIdFromFieldName field");
+
+      assertThat(testOne.apply(b -> b.withZoneIdFromFieldName("timeZone").withDefaultZoneId("UTC")))
+         .hasSize(1).first().asString()
+         .contains("You may not specify both zoneIdFromFieldName and defaultZoneId");
+
+      assertThat(testOne.apply(b -> b.withDefaultZoneId("UTC").withFallbackZoneId("UTC")))
+         .hasSize(2)
+         .anyMatch(s -> s.contains("You may not specify both defaultZoneId and fallbackZoneId"))
+         .anyMatch(s -> s.contains("You may only set fallbackZoneId if using zoneIdFromFieldName"));
+
+      assertThat(testOne.apply(b -> b.withFallbackZoneId("UTC")))
+         .hasSize(1).first().asString()
+         .contains("You may only set fallbackZoneId if using zoneIdFromFieldName");
+
+      assertThat(testOne.apply(b -> b.withDefaultZoneId("notAZone")))
+         .hasSize(1).first().asString()
+         .contains("Invalid ZoneId [notAZone] for [defaultZoneId]");
+
+      assertThat(testOne.apply(b -> b.withZoneIdFromFieldName("timeZone").withFallbackZoneId("notAZone")))
+         .hasSize(1).first().asString()
+         .contains("Invalid ZoneId [notAZone] for [fallbackZoneId]");
+
+      assertThat(new DateTimeDisplayValueBehavior().validateBehaviorConfiguration(table, table.getField("firstName")))
+         .hasSize(1).first().asString()
+         .contains("non-DATE_TIME field [firstName]");
+   }
+
+}