Return mutation result as entity object (#2612)

* Make clientMutationId nullable

* Return mutation result as entity object

Fixes #2605

* Change normalization context for test

* Fix normalization and delete

* Fix unit tests

* Use a new type for the wrapped object only when normalization context is used for the mutation

Author: lukasluecke

features/graphql/authorization.feature

@@ -45,8 +45,10 @@ Feature: Authorization checking
     """
     mutation {
       createSecuredDummy(input: {owner: "me", title: "Hi", description: "Desc", clientMutationId: "auth"}) {
-        title
-        owner
+        securedDummy {
+          title
+          owner
+        }
       }
     }
     """

features/graphql/introspection.feature

@@ -292,6 +292,20 @@ Feature: GraphQL introspection support
           }
         }
       }
+      typeCreatePayloadData: __type(name: "createDummyGroupPayloadData") {
+        description,
+        fields {
+          name
+          type {
+            name
+            kind
+            ofType {
+              name
+              kind
+            }
+          }
+        }
+      }
     }
     """
     Then the response status code should be 200
@@ -304,10 +318,72 @@ Feature: GraphQL introspection support
     And the JSON node "data.typeCreateInput.inputFields[0].name" should be equal to "bar"
     And the JSON node "data.typeCreateInput.inputFields[1].name" should be equal to "baz"
     And the JSON node "data.typeCreateInput.inputFields[2].name" should be equal to "clientMutationId"
-    And the JSON node "data.typeCreatePayload.fields" should have 3 elements
-    And the JSON node "data.typeCreatePayload.fields[0].name" should be equal to "id"
-    And the JSON node "data.typeCreatePayload.fields[1].name" should be equal to "bar"
-    And the JSON node "data.typeCreatePayload.fields[2].name" should be equal to "clientMutationId"
+    And the JSON node "data.typeCreatePayload.fields" should have 2 elements
+    And the JSON node "data.typeCreatePayload.fields[0].name" should be equal to "dummyGroup"
+    And the JSON node "data.typeCreatePayload.fields[0].type.name" should be equal to "createDummyGroupPayloadData"
+    And the JSON node "data.typeCreatePayload.fields[1].name" should be equal to "clientMutationId"
+    And the JSON node "data.typeCreatePayloadData.fields" should have 2 elements
+    And the JSON node "data.typeCreatePayloadData.fields[0].name" should be equal to "id"
+    And the JSON node "data.typeCreatePayloadData.fields[1].name" should be equal to "bar"
+
+  Scenario: Retrieve nested mutation payload data fields
+    When I send the following GraphQL request:
+    """
+    {
+      typeCreatePayload: __type(name: "createDummyPropertyPayload") {
+        description,
+        fields {
+          name
+          type {
+            name
+            kind
+            ofType {
+              name
+              kind
+            }
+          }
+        }
+      }
+      typeCreatePayloadData: __type(name: "createDummyPropertyPayloadData") {
+        description,
+        fields {
+          name
+          type {
+            name
+            kind
+            ofType {
+              name
+              kind
+            }
+          }
+        }
+      }
+      typeCreateNestedPayload: __type(name: "createDummyGroupNestedPayload") {
+        description,
+        fields {
+          name
+          type {
+            name
+            kind
+            ofType {
+              name
+              kind
+            }
+          }
+        }
+      }
+    }
+    """
+    Then the response status code should be 200
+    And the response should be in JSON
+    And the header "Content-Type" should be equal to "application/json"
+    And the JSON node "data.typeCreatePayload.fields" should have 2 elements
+    And the JSON node "data.typeCreatePayload.fields[0].name" should be equal to "dummyProperty"
+    And the JSON node "data.typeCreatePayload.fields[0].type.name" should be equal to "createDummyPropertyPayloadData"
+    And the JSON node "data.typeCreatePayload.fields[1].name" should be equal to "clientMutationId"
+    And the JSON node "data.typeCreatePayloadData.fields[3].name" should be equal to "group"
+    And the JSON node "data.typeCreatePayloadData.fields[3].type.name" should be equal to "createDummyGroupNestedPayload"
+    And the JSON node "data.typeCreateNestedPayload.fields[0].name" should be equal to "id"
 
   Scenario: Retrieve an item through a GraphQL query
     Given there are 4 dummy objects with relatedDummy