Entity reference: Scope direct queries (#703)

Previously, all the queries where exposed straight on the entity type, not
taking into account the bundles on which the field actually appears.

This changes it to keep exposing the base fields on the entity type interface,
but expose the configurable entity reference fields only on the bundles they're
attached to.

Author: defr

modules/graphql_core/src/Plugin/Deriver/Fields/EntityReferenceQueryDeriver.php

@@ -72,6 +72,8 @@ public function __construct(
    * {@inheritdoc}
    */
   public function getDerivativeDefinitions($basePluginDefinition) {
+    $fieldMap = $this->entityFieldManager->getFieldMap();
+
     foreach ($this->entityTypeManager->getDefinitions() as $entityTypeId => $entityType) {
       $interfaces = class_implements($entityType->getClass());
       if (!array_key_exists(FieldableEntityInterface::class, $interfaces)) {
@@ -89,8 +91,18 @@ public function getDerivativeDefinitions($basePluginDefinition) {
 
         $targetType = $this->entityTypeManager->getDefinition($targetTypeId);
         $fieldName = $fieldDefinition->getName();
+
+        if ($fieldDefinition instanceof BaseFieldDefinition || !$entityType->hasKey('bundle')) {
+          $parents = [StringHelper::camelCase($entityTypeId)];
+        }
+        else {
+          $parents = [];
+          foreach ($fieldMap[$entityTypeId][$fieldName]['bundles'] as $bundle) {
+            $parents[] = StringHelper::camelCase($entityTypeId . '_' . $bundle);
+          }
+        }
         $derivative = [
-          'parents' => [StringHelper::camelCase($entityTypeId)],
+          'parents' => $parents,
           'name' => StringHelper::propCase('query', $fieldName),
           'description' => $this->t('Query reference: @description', [
             '@description' => $fieldDefinition->getDescription(),