Issue #2954982 by Matroskeen, abramm, Rob230: Incorrect bundle/bundle key handling in EntityContentBase::processStubRow()

core/modules/migrate/src/Plugin/migrate/destination/EntityContentBase.php

@@ -311,7 +311,7 @@ class EntityContentBase extends Entity implements HighestIdInterface, MigrateVal
 
     // Populate any required fields not already populated.
     $fields = $this->entityFieldManager
-      ->getFieldDefinitions($this->storage->getEntityTypeId(), $bundle_key);
+      ->getFieldDefinitions($this->storage->getEntityTypeId(), $row->getDestinationProperty($bundle_key));
     foreach ($fields as $field_name => $field_definition) {
       if ($field_definition->isRequired() && is_null($row->getDestinationProperty($field_name))) {
         // Use the configured default value for this specific field, if any.

core/modules/migrate/tests/modules/migrate_stub_test/migrations/sample_stubbing_migration.yml

@@ -11,6 +11,8 @@ source:
       title: "Sample 2"
       bodyvalue: "This is the body for ID 25"
       bodyformat: "plain_text"
+    - id: 33
+      title: "Sample 3"
   ids:
     id:
       type: integer

core/modules/migrate/tests/src/Kernel/MigrateStubTest.php

@@ -2,6 +2,7 @@
 
 namespace Drupal\Tests\migrate\Kernel;
 
+use Drupal\field\Entity\FieldConfig;
 use Drupal\Tests\node\Traits\ContentTypeCreationTrait;
 
 /**
@@ -21,6 +22,7 @@ class MigrateStubTest extends MigrateTestBase {
     'field',
     'user',
     'text',
+    'filter',
     'migrate_stub_test',
   ];
 
@@ -99,6 +101,24 @@ class MigrateStubTest extends MigrateTestBase {
     $this->assertSame("Sample 1", $node->label());
   }
 
+  /**
+   * Tests stub creation with bundle fields.
+   */
+  public function testStubWithBundleFields() {
+    $this->createContentType(['type' => 'node_stub']);
+    // Make "Body" field required to make stubbing populate field value.
+    $body_field = FieldConfig::loadByName('node', 'node_stub', 'body');
+    $body_field->setRequired(TRUE)->save();
+
+    $this->assertSame([], $this->migrateLookup->lookup('sample_stubbing_migration', [33]));
+    $ids = $this->migrateStub->createStub('sample_stubbing_migration', [33], []);
+    $this->assertSame([$ids], $this->migrateLookup->lookup('sample_stubbing_migration', [33]));
+    $node = \Drupal::entityTypeManager()->getStorage('node')->load($ids['nid']);
+    $this->assertNotNull($node);
+    // Make sure the "Body" field value was populated.
+    $this->assertNotEmpty($node->get('body')->value);
+  }
+
   /**
    * Test invalid source id count.
    */