fix: GraphQL file upload fails in case of use of pointer or relation (#8721)

src/GraphQL/loaders/parseClassMutations.js

@@ -82,6 +82,7 @@ const load = function (parseGraphQLSchema, parseClass, parseClassConfig: ?ParseG
           const parseFields = await transformTypes('create', fields, {
             className,
             parseGraphQLSchema,
+            originalFields: args.fields,
             req: { config, auth, info },
           });
 
@@ -190,6 +191,7 @@ const load = function (parseGraphQLSchema, parseClass, parseClassConfig: ?ParseG
           const parseFields = await transformTypes('update', fields, {
             className,
             parseGraphQLSchema,
+            originalFields: args.fields,
             req: { config, auth, info },
           });
 

src/GraphQL/loaders/usersMutations.js

@@ -38,6 +38,7 @@ const load = parseGraphQLSchema => {
         const parseFields = await transformTypes('create', fields, {
           className: '_User',
           parseGraphQLSchema,
+          originalFields: args.fields,
           req: { config, auth, info },
         });
 
@@ -114,6 +115,7 @@ const load = parseGraphQLSchema => {
         const parseFields = await transformTypes('create', fields, {
           className: '_User',
           parseGraphQLSchema,
+          originalFields: args.fields,
           req: { config, auth, info },
         });
 

src/GraphQL/transformers/mutation.js

@@ -7,7 +7,7 @@ import * as objectsMutations from '../helpers/objectsMutations';
 const transformTypes = async (
   inputType: 'create' | 'update',
   fields,
-  { className, parseGraphQLSchema, req }
+  { className, parseGraphQLSchema, req, originalFields }
 ) => {
   const {
     classGraphQLCreateType,
@@ -44,13 +44,16 @@ const transformTypes = async (
             fields[field] = transformers.polygon(fields[field]);
             break;
           case inputTypeField.type === defaultGraphQLTypes.FILE_INPUT:
-            fields[field] = await transformers.file(fields[field], req);
+            // Use `originalFields` to handle file upload since fields are a deepcopy and do not
+            // keep the file object
+            fields[field] = await transformers.file(originalFields[field], req);
             break;
           case parseClass.fields[field].type === 'Relation':
             fields[field] = await transformers.relation(
               parseClass.fields[field].targetClass,
               field,
               fields[field],
+              originalFields[field],
               parseGraphQLSchema,
               req
             );
@@ -64,6 +67,7 @@ const transformTypes = async (
               parseClass.fields[field].targetClass,
               field,
               fields[field],
+              originalFields[field],
               parseGraphQLSchema,
               req
             );
@@ -135,7 +139,14 @@ const transformers = {
     }
     return parseACL;
   },
-  relation: async (targetClass, field, value, parseGraphQLSchema, { config, auth, info }) => {
+  relation: async (
+    targetClass,
+    field,
+    value,
+    originalValue,
+    parseGraphQLSchema,
+    { config, auth, info }
+  ) => {
     if (Object.keys(value).length === 0)
       throw new Parse.Error(
         Parse.Error.INVALID_POINTER,
@@ -151,9 +162,10 @@ const transformers = {
     if (value.createAndAdd) {
       nestedObjectsToAdd = (
         await Promise.all(
-          value.createAndAdd.map(async input => {
+          value.createAndAdd.map(async (input, i) => {
             const parseFields = await transformTypes('create', input, {
               className: targetClass,
+              originalFields: originalValue.createAndAdd[i],
               parseGraphQLSchema,
               req: { config, auth, info },
             });
@@ -204,7 +216,14 @@ const transformers = {
     }
     return op;
   },
-  pointer: async (targetClass, field, value, parseGraphQLSchema, { config, auth, info }) => {
+  pointer: async (
+    targetClass,
+    field,
+    value,
+    originalValue,
+    parseGraphQLSchema,
+    { config, auth, info }
+  ) => {
     if (Object.keys(value).length > 1 || Object.keys(value).length === 0)
       throw new Parse.Error(
         Parse.Error.INVALID_POINTER,
@@ -216,6 +235,7 @@ const transformers = {
       const parseFields = await transformTypes('create', value.createAndLink, {
         className: targetClass,
         parseGraphQLSchema,
+        originalFields: originalValue.createAndLink,
         req: { config, auth, info },
       });
       nestedObjectToAdd = await objectsMutations.createObject(