GraphQL classConfig query alias (#6257)

* adds alias option

* added tests

spec/ParseGraphQLSchema.spec.js

@@ -564,4 +564,102 @@ describe('ParseGraphQLSchema', () => {
       ).toEqual(Object.keys(mutations2).sort());
     });
   });
+
+  describe('query alias', () => {
+    it('Should be able to define alias for find query', async () => {
+      const parseGraphQLSchema = new ParseGraphQLSchema({
+        databaseController,
+        parseGraphQLController,
+        log: defaultLogger,
+        appId,
+      });
+
+      await parseGraphQLSchema.parseGraphQLController.updateGraphQLConfig({
+        classConfigs: [
+          {
+            className: 'Data',
+            query: {
+              get: true,
+              getAlias: 'precious_data',
+              find: true,
+              findAlias: 'data_results',
+            },
+          },
+        ],
+      });
+
+      const data = new Parse.Object('Data');
+
+      await data.save();
+
+      await parseGraphQLSchema.databaseController.schemaCache.clear();
+      await parseGraphQLSchema.load();
+
+      const queries1 = parseGraphQLSchema.graphQLQueries;
+
+      expect(Object.keys(queries1)).toContain('data_results');
+      expect(Object.keys(queries1)).toContain('precious_data');
+    });
+
+    it('should fail if query alias is not a string', async () => {
+      const parseGraphQLSchema = new ParseGraphQLSchema({
+        databaseController,
+        parseGraphQLController,
+        log: defaultLogger,
+        appId,
+      });
+
+      const classConfigsBoolFindAlias = {
+        classConfigs: [
+          {
+            className: 'Data',
+            query: {
+              get: true,
+              getAlias: 'valid',
+              find: true,
+              findAlias: true,
+            },
+          },
+        ],
+      };
+
+      const classConfigsNumberGetAlias = {
+        classConfigs: [
+          {
+            className: 'Pants',
+            query: {
+              get: true,
+              getAlias: 1,
+              find: true,
+              findAlias: 'valid',
+            },
+          },
+        ],
+      };
+
+      let className;
+
+      className = classConfigsBoolFindAlias.classConfigs[0].className;
+      try {
+        await parseGraphQLSchema.parseGraphQLController.updateGraphQLConfig(
+          classConfigsBoolFindAlias
+        );
+      } catch (e) {
+        expect(e).toMatch(
+          `Invalid graphQLConfig: classConfig:${className} is invalid because "query.findAlias" must be a string`
+        );
+      }
+
+      className = classConfigsNumberGetAlias.classConfigs[0].className;
+      try {
+        await parseGraphQLSchema.parseGraphQLController.updateGraphQLConfig(
+          classConfigsNumberGetAlias
+        );
+      } catch (e) {
+        expect(e).toMatch(
+          `Invalid graphQLConfig: classConfig:${className} is invalid because "query.getAlias" must be a string`
+        );
+      }
+    });
+  });
 });