feat: add updateFlow mutation

packages/backend/src/graphql/mutations/update-flow.ts

@@ -0,0 +1,33 @@
+import { GraphQLInt, GraphQLString, GraphQLNonNull } from 'graphql';
+import Flow from '../../models/flow';
+import flowType from '../types/flow';
+import RequestWithCurrentUser from '../../types/express/request-with-current-user';
+
+type Params = {
+  id: string,
+  data: object
+}
+const updateFlowResolver = async (params: Params, req: RequestWithCurrentUser) => {
+  let flow = await Flow.query().findOne({
+    user_id: req.currentUser.id,
+    id: params.id
+  }).throwIfNotFound();
+
+  flow = await flow.$query().patchAndFetch({
+    ...flow,
+    ...params
+  })
+
+  return flow;
+}
+
+const updateFlow = {
+  type: flowType,
+  args: {
+    id: { type: GraphQLNonNull(GraphQLInt) },
+    name: { type: GraphQLNonNull(GraphQLString) }
+  },
+  resolve: (_: any, params: Params, req: RequestWithCurrentUser) => updateFlowResolver(params, req)
+};
+
+export default updateFlow;