Add toQRecordOnlyChangedFields

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/model/data/QRecordEntity.java

@@ -31,8 +31,11 @@ import java.time.LocalDate;
 import java.time.LocalTime;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.HashMap;
 import java.util.List;
 import java.util.Locale;
+import java.util.Map;
+import java.util.Objects;
 import java.util.Optional;
 import com.kingsrook.qqq.backend.core.exceptions.QException;
 import com.kingsrook.qqq.backend.core.exceptions.QRuntimeException;
@@ -49,6 +52,8 @@ public abstract class QRecordEntity
 
    private static final ListingHash<Class<? extends QRecordEntity>, QRecordEntityField> fieldMapping = new ListingHash<>();
 
+   private Map<String, Serializable> originalRecordValues;
+
 
 
    /*******************************************************************************
@@ -80,11 +85,13 @@ public abstract class QRecordEntity
       try
       {
          List<QRecordEntityField> fieldList = getFieldList(this.getClass());
+         originalRecordValues = new HashMap<>();
          for(QRecordEntityField qRecordEntityField : fieldList)
          {
             Serializable value      = qRecord.getValue(qRecordEntityField.getFieldName());
             Object       typedValue = qRecordEntityField.convertValueType(value);
             qRecordEntityField.getSetter().invoke(this, typedValue);
+            originalRecordValues.put(qRecordEntityField.getFieldName(), value);
          }
       }
       catch(Exception e)
@@ -121,6 +128,41 @@ public abstract class QRecordEntity
 
 
 
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   public QRecord toQRecordOnlyChangedFields()
+   {
+      try
+      {
+         QRecord qRecord = new QRecord();
+
+         List<QRecordEntityField> fieldList = getFieldList(this.getClass());
+         for(QRecordEntityField qRecordEntityField : fieldList)
+         {
+            Serializable thisValue     = (Serializable) qRecordEntityField.getGetter().invoke(this);
+            Serializable originalValue = null;
+            if(originalRecordValues != null)
+            {
+               originalValue = originalRecordValues.get(qRecordEntityField.getFieldName());
+            }
+
+            if(!Objects.equals(thisValue, originalValue))
+            {
+               qRecord.setValue(qRecordEntityField.getFieldName(), thisValue);
+            }
+         }
+
+         return (qRecord);
+      }
+      catch(Exception e)
+      {
+         throw (new QRuntimeException("Error building qRecord from entity.", e));
+      }
+   }
+
+
+
    /*******************************************************************************
     **
     *******************************************************************************/

qqq-backend-core/src/test/java/com/kingsrook/qqq/backend/core/model/data/QRecordEntityTest.java

@@ -67,6 +67,35 @@ class QRecordEntityTest extends BaseTest
 
 
 
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   @Test
+   void testItemToQRecordOnlyChangedFields() throws QException
+   {
+      Item item = new Item(new QRecord()
+         .withValue("sku", "ABC-123")
+         .withValue("description", null)
+         .withValue("quantity", 47)
+         .withValue("price", new BigDecimal("3.50"))
+         .withValue("isFeatured", true));
+
+      QRecord qRecordOnlyChangedFields = item.toQRecordOnlyChangedFields();
+      assertTrue(qRecordOnlyChangedFields.getValues().isEmpty());
+
+      item.setDescription("My Changed Item");
+      qRecordOnlyChangedFields = item.toQRecordOnlyChangedFields();
+      assertEquals(1, qRecordOnlyChangedFields.getValues().size());
+      assertEquals("My Changed Item", qRecordOnlyChangedFields.getValueString("description"));
+
+      item.setPrice(null);
+      qRecordOnlyChangedFields = item.toQRecordOnlyChangedFields();
+      assertEquals(2, qRecordOnlyChangedFields.getValues().size());
+      assertNull(qRecordOnlyChangedFields.getValueString("price"));
+   }
+
+
+
    /*******************************************************************************
     **
     *******************************************************************************/

qqq-backend-core/src/test/java/com/kingsrook/qqq/backend/core/model/data/testentities/Item.java

@@ -24,6 +24,7 @@ package com.kingsrook.qqq.backend.core.model.data.testentities;
 
 import java.math.BigDecimal;
 import com.kingsrook.qqq.backend.core.model.data.QField;
+import com.kingsrook.qqq.backend.core.model.data.QRecord;
 import com.kingsrook.qqq.backend.core.model.data.QRecordEntity;
 import com.kingsrook.qqq.backend.core.model.metadata.fields.DisplayFormat;
 
@@ -49,6 +50,27 @@ public class Item extends QRecordEntity
 
 
 
+   /*******************************************************************************
+    ** Constructor
+    **
+    *******************************************************************************/
+   public Item()
+   {
+   }
+
+
+
+   /*******************************************************************************
+    ** Constructor
+    **
+    *******************************************************************************/
+   public Item(QRecord qRecord)
+   {
+      populateFromQRecord(qRecord);
+   }
+
+
+
    /*******************************************************************************
     ** Getter for sku
     **