fix: afterSave trigger removes pointer in Parse object (#7913)

src/Controllers/SchemaController.js

@@ -150,9 +150,15 @@ const defaultColumns: { [string]: SchemaFields } = Object.freeze({
   },
 });
 
+// fields required for read or write operations on their respective classes.
 const requiredColumns = Object.freeze({
-  _Product: ['productIdentifier', 'icon', 'order', 'title', 'subtitle'],
-  _Role: ['name', 'ACL'],
+  read: {
+    _User: ['username'],
+  },
+  write: {
+    _Product: ['productIdentifier', 'icon', 'order', 'title', 'subtitle'],
+    _Role: ['name', 'ACL'],
+  }
 });
 
 const invalidColumns = ['length'];
@@ -1269,7 +1275,7 @@ export default class SchemaController {
 
   // Validates that all the properties are set for the object
   validateRequiredColumns(className: string, object: any, query: any) {
-    const columns = requiredColumns[className];
+    const columns = requiredColumns.write[className];
     if (!columns || columns.length == 0) {
       return Promise.resolve(this);
     }
@@ -1600,4 +1606,5 @@ export {
   convertSchemaToAdapterSchema,
   VolatileClassesSchemas,
   SchemaController,
+  requiredColumns,
 };