AWS AppSync: Subscription Not Triggering for DynamoDB Updates in React App
Quick question that's been bugging me - I'm currently working with an scenario with AWS AppSync where my GraphQL subscription for DynamoDB updates isn’t triggering as expected in my React application. I have set up a simple schema with a subscription that listens to updates on a specific item in the DynamoDB table. Despite the mutation working correctly and the data being updated in DynamoDB, the subscription doesn't seem to notify the clients. Here's a snippet of my GraphQL subscription: ```graphql subscription OnUpdateTodo { onUpdateTodo { id title completed } } ``` And I have a corresponding mutation that updates the item: ```graphql mutation UpdateTodo($id: ID!, $title: String!, $completed: Boolean!) { updateTodo(input: {id: $id, title: $title, completed: $completed}) { id title completed } } ``` In my React component, I’ve used the `useSubscription` hook from the AWS Amplify library like this: ```javascript import { useSubscription } from '@apollo/client'; import { gql } from 'apollo-boost'; const ON_UPDATE_TODO = gql` subscription OnUpdateTodo { onUpdateTodo { id title completed } } `; function TodoList() { const { data, loading, behavior } = useSubscription(ON_UPDATE_TODO); // Handle loading, behavior, and data... } ``` I've verified that my AppSync API is set up correctly, and the IAM roles associated with the AppSync service have sufficient permissions. However, I’m not receiving updates on the client when I perform the mutation. The `onUpdateTodo` subscription works perfectly fine in other environments, and we’re using AWS Amplify version 4.3.0. I've also checked the CloudWatch logs, and there are no behavior messages indicating an scenario with the subscription endpoint. This leads me to believe the question may lie within the client-side implementation or the subscription configuration in AppSync. Has anyone encountered similar issues? Any insights on what might be going wrong or how to debug this further would be greatly appreciated. Thanks for your help in advance!