diff --git a/qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/actions/customizers/RecordCustomizerUtilityInterface.java b/qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/actions/customizers/RecordCustomizerUtilityInterface.java
new file mode 100644
index 00000000..ff8c2d82
--- /dev/null
+++ b/qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/actions/customizers/RecordCustomizerUtilityInterface.java
@@ -0,0 +1,149 @@
+/*
+ * QQQ - Low-code Application Framework for Engineers.
+ * Copyright (C) 2021-2023. 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 .
+ */
+
+package com.kingsrook.qqq.backend.core.actions.customizers;
+
+
+import java.io.Serializable;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+import com.kingsrook.qqq.backend.core.context.QContext;
+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.fields.QFieldMetaData;
+import com.kingsrook.qqq.backend.core.model.metadata.tables.QTableMetaData;
+import com.kingsrook.qqq.backend.core.model.statusmessages.BadInputStatusMessage;
+import com.kingsrook.qqq.backend.core.utils.StringUtils;
+import com.kingsrook.qqq.backend.core.utils.ValueUtils;
+import static com.kingsrook.qqq.backend.core.logging.LogUtils.logPair;
+
+
+/*******************************************************************************
+ ** Interface with utility methods that pre insert/update/delete customizers
+ ** may want to use.
+ *******************************************************************************/
+public interface RecordCustomizerUtilityInterface
+{
+ QLogger LOG = QLogger.getLogger(RecordCustomizerUtilityInterface.class);
+
+
+
+ /*******************************************************************************
+ ** Container for an old value and a new value.
+ *******************************************************************************/
+ @SuppressWarnings("checkstyle:MethodName")
+ record Change(Serializable oldValue, Serializable newValue)
+ {
+ }
+
+
+ /*******************************************************************************
+ **
+ *******************************************************************************/
+ default Map getChanges(String tableName, QRecord oldRecord, QRecord newRecord)
+ {
+ Map rs = new HashMap<>();
+
+ QTableMetaData table = QContext.getQInstance().getTable(tableName);
+ for(Map.Entry entry : newRecord.getValues().entrySet())
+ {
+ String fieldName = entry.getKey();
+ Serializable newValue = entry.getValue();
+ Serializable oldValue = oldRecord.getValue(fieldName);
+
+ try
+ {
+ QFieldMetaData field = table.getField(fieldName);
+ Serializable newTypedValue = ValueUtils.getValueAsFieldType(field.getType(), newValue);
+ Serializable oldTypedValue = ValueUtils.getValueAsFieldType(field.getType(), oldValue);
+
+ if(!Objects.equals(oldTypedValue, newTypedValue))
+ {
+ rs.put(fieldName, new Change(oldTypedValue, newTypedValue));
+ }
+ }
+ catch(Exception e)
+ {
+ LOG.info("Error getting a value as field's type", e, logPair("fieldName", fieldName), logPair("oldValue", oldValue), logPair("newValue", newValue));
+ }
+ }
+
+ return (rs);
+ }
+
+ /*******************************************************************************
+ **
+ *******************************************************************************/
+ default void errorIfNoValue(Serializable value, QRecord record, String errorMessage)
+ {
+ errorIf(!StringUtils.hasContent(ValueUtils.getValueAsString(value)), record, errorMessage);
+ }
+
+
+ /*******************************************************************************
+ **
+ *******************************************************************************/
+ default void errorIfEditedValue(QRecord oldRecord, QRecord newRecord, String fieldName, String errorMessage)
+ {
+ if(newRecord.getValues().containsKey(fieldName))
+ {
+ errorIf(isChangedValue(oldRecord.getValue(fieldName), newRecord.getValue(fieldName)), newRecord, errorMessage);
+ }
+ }
+
+
+ /*******************************************************************************
+ **
+ *******************************************************************************/
+ default boolean isChangedValue(Serializable oldValue, Serializable newValue)
+ {
+ //////////////////////////////////////////////
+ // todo - probably ... some type "coercion" //
+ //////////////////////////////////////////////
+ return (!Objects.equals(oldValue, newValue));
+ }
+
+
+ /*******************************************************************************
+ **
+ *******************************************************************************/
+ default void errorIfAnyValue(Serializable value, QRecord record, String errorMessage)
+ {
+ if(StringUtils.hasContent(ValueUtils.getValueAsString(value)))
+ {
+ record.addError(new BadInputStatusMessage(errorMessage));
+ }
+ }
+
+
+ /*******************************************************************************
+ **
+ *******************************************************************************/
+ default void errorIf(boolean condition, QRecord record, String errorMessage)
+ {
+ if(condition)
+ {
+ record.addError(new BadInputStatusMessage(errorMessage));
+ }
+ }
+
+}
diff --git a/qqq-backend-core/src/test/java/com/kingsrook/qqq/backend/core/actions/customizers/RecordCustomizerUtilityInterfaceTest.java b/qqq-backend-core/src/test/java/com/kingsrook/qqq/backend/core/actions/customizers/RecordCustomizerUtilityInterfaceTest.java
new file mode 100644
index 00000000..ad28afcd
--- /dev/null
+++ b/qqq-backend-core/src/test/java/com/kingsrook/qqq/backend/core/actions/customizers/RecordCustomizerUtilityInterfaceTest.java
@@ -0,0 +1,135 @@
+/*
+ * QQQ - Low-code Application Framework for Engineers.
+ * Copyright (C) 2021-2023. 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 .
+ */
+
+package com.kingsrook.qqq.backend.core.actions.customizers;
+
+
+import java.util.Map;
+import com.kingsrook.qqq.backend.core.BaseTest;
+import com.kingsrook.qqq.backend.core.model.data.QRecord;
+import com.kingsrook.qqq.backend.core.utils.TestUtils;
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+
+/*******************************************************************************
+ ** Unit test for RecordCustomizerUtilityInterface
+ *******************************************************************************/
+class RecordCustomizerUtilityInterfaceTest extends BaseTest implements RecordCustomizerUtilityInterface
+{
+
+ /*******************************************************************************
+ **
+ *******************************************************************************/
+ @Test
+ void testGetChanges()
+ {
+ Map changes = getChanges(TestUtils.TABLE_NAME_PERSON_MEMORY,
+ new QRecord().withValue("id", 1).withValue("firstName", "Homer"),
+ new QRecord().withValue("id", 2).withValue("firstName", "Homer"));
+
+ assertEquals(1, changes.size());
+ assertEquals(new Change(1, 2), changes.get("id"));
+ }
+
+
+
+ /*******************************************************************************
+ **
+ *******************************************************************************/
+ @Test
+ void testErrorIfNoValue()
+ {
+ {
+ QRecord record = new QRecord();
+ errorIfNoValue(null, record, "no value");
+ assertEquals(1, record.getErrors().size());
+ assertEquals("no value", record.getErrors().get(0).getMessage());
+ }
+ {
+ QRecord record = new QRecord();
+ errorIfNoValue("", record, "no value");
+ assertEquals(1, record.getErrors().size());
+ assertEquals("no value", record.getErrors().get(0).getMessage());
+ }
+ {
+ QRecord record = new QRecord();
+ errorIfNoValue("hi", record, "no value");
+ assertEquals(0, record.getErrors().size());
+ }
+ }
+
+
+
+ /*******************************************************************************
+ **
+ *******************************************************************************/
+ @Test
+ void testErrorIfAnyValue()
+ {
+ {
+ QRecord record = new QRecord();
+ errorIfAnyValue(null, record, "any value");
+ assertEquals(0, record.getErrors().size());
+ }
+ {
+ QRecord record = new QRecord();
+ errorIfAnyValue("", record, "any value");
+ assertEquals(0, record.getErrors().size());
+ }
+ {
+ QRecord record = new QRecord();
+ errorIfAnyValue("hi", record, "any value");
+ assertEquals(1, record.getErrors().size());
+ assertEquals("any value", record.getErrors().get(0).getMessage());
+ }
+ }
+
+
+
+ /*******************************************************************************
+ **
+ *******************************************************************************/
+ @Test
+ void testErrorIfEditedValue()
+ {
+ {
+ QRecord oldRecord = new QRecord().withValue("id", 1).withValue("firstName", "Homer");
+ QRecord newRecord = new QRecord().withValue("id", 1).withValue("firstName", "Marge");
+ errorIfEditedValue(oldRecord, newRecord, "firstName", "changed firstName");
+ assertEquals(1, newRecord.getErrors().size());
+ assertEquals("changed firstName", newRecord.getErrors().get(0).getMessage());
+ }
+ {
+ QRecord oldRecord = new QRecord().withValue("id", 1).withValue("firstName", "Homer");
+ QRecord newRecord = new QRecord().withValue("id", 1).withValue("firstName", "Homer");
+ errorIfEditedValue(oldRecord, newRecord, "firstName", "changed firstName");
+ assertEquals(0, newRecord.getErrors().size());
+ }
+ {
+ QRecord oldRecord = new QRecord().withValue("id", 1).withValue("firstName", "Homer");
+ QRecord newRecord = new QRecord().withValue("id", 1);
+ errorIfEditedValue(oldRecord, newRecord, "firstName", "changed firstName");
+ assertEquals(0, newRecord.getErrors().size());
+ }
+ }
+
+}
\ No newline at end of file