DBComposite::writeToManipulation() is never called

src/ORM/DataObject.php

@@ -1491,7 +1491,7 @@ protected function prepareManipulationTable($baseTable, $now, $isNewRecord, &$ma
             $specification = $schema->fieldSpec(
                 $class,
                 $fieldName,
-                DataObjectSchema::DB_ONLY | DataObjectSchema::UNINHERITED
+                DataObjectSchema::UNINHERITED
             );
             if (!$specification) {
                 continue;

tests/php/ORM/DBCompositeTest.php

@@ -53,7 +53,8 @@ public function testCompositeFieldMetaDataFunctions()
         $this->assertEquals(
             [
                 'MyMoney' => 'Money',
-                'OverriddenMoney' => 'Money'
+                'OverriddenMoney' => 'Money',
+                'DoubleMoney' => DBCompositeTest\DBDoubleMoney::class
             ],
             $schema->compositeFields(DBCompositeTest\TestObject::class)
         );
@@ -68,6 +69,7 @@ public function testCompositeFieldMetaDataFunctions()
                 'MyMoney' => 'Money',
                 'OtherMoney' => 'Money',
                 'OverriddenMoney' => 'Money',
+                'DoubleMoney' => DBCompositeTest\DBDoubleMoney::class
             ],
             $schema->compositeFields(DBCompositeTest\SubclassedDBFieldObject::class)
         );
@@ -111,4 +113,22 @@ public function testInheritedTables()
         $this->assertEquals('DBCompositeTest_SubclassedDBFieldObject', $object2->dbObject('OtherMoney')->getTable());
         $this->assertEquals('DBCompositeTest_SubclassedDBFieldObject', $object2->dbObject('OverriddenMoney')->getTable());
     }
+
+    public function testWriteToManipuationIsCalledWhenWritingDataObject()
+    {
+        $obj = DBCompositeTest\TestObject::create();
+        $obj->DoubleMoney = ['Amount' => 10, 'Currency' => 'CAD'];
+        $moneyField = $obj->dbObject('DoubleMoney');
+        $this->assertEquals(10, $moneyField->getAmount());
+
+        $obj->write();
+
+        // Custom money class should double the amount before writing
+        $this->assertEquals(20, $moneyField->getAmount());
+
+        // Note: these would fail since dbObject will return a new instance
+        // of the DoubleMoney field based on the initial values
+        // $this->assertSame($moneyField, $obj->dbObject('DoubleMoney'));
+        // $this->assertEquals(20, $obj->dbObject('DoubleMoney')->getAmount());
+    }
 }

tests/php/ORM/DBCompositeTest/DBDoubleMoney.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace SilverStripe\ORM\Tests\DBCompositeTest;
+
+use SilverStripe\Dev\TestOnly;
+use SilverStripe\ORM\FieldType\DBMoney;
+
+class DBDoubleMoney extends DBMoney implements TestOnly
+{
+    public function writeToManipulation(&$manipulation)
+    {
+        // Duplicate the amount before writing
+        $this->setAmount($this->getAmount() * 2);
+
+        parent::writeToManipulation($manipulation);
+    }
+}

tests/php/ORM/DBCompositeTest/TestObject.php

@@ -12,6 +12,7 @@ class TestObject extends DataObject implements TestOnly
     private static $db = [
         'Title' => 'Text',
         'MyMoney' => 'Money',
-        'OverriddenMoney' => 'Money'
+        'OverriddenMoney' => 'Money',
+        'DoubleMoney' => DBDoubleMoney::class,
     ];
 }