CodexBloom - Programming Q&A Platform

AWS AppSync GraphQL Mutation Not Returning Updated Item After DynamoDB Write

πŸ‘€ Views: 474 πŸ’¬ Answers: 1 πŸ“… Created: 2025-06-23
AWS AppSync DynamoDB GraphQL JavaScript

Could someone explain I'm upgrading from an older version and I'm confused about Hey everyone, I'm running into an issue that's driving me crazy. I'm currently using AWS AppSync to manage my GraphQL API, and I'm working with an scenario where a mutation that writes to DynamoDB does not return the updated item as expected. My mutation is defined to return the item after creation, but I'm only seeing the input values returned instead of the newly created item. Here’s the mutation setup in my GraphQL schema: ```graphql type Mutation { createPost(input: PostInput!): Post } ``` And the corresponding resolver for the `createPost` mutation is set up to write to a DynamoDB table called `Posts`. I configured the resolver like this: ```json { "version": "2018-05-29", "operation": "PutItem", "key": { "id": "$ctx.args.input.id" }, "attributeValues": { "title": "$ctx.args.input.title", "content": "$ctx.args.input.content" }, "returnValues": "ALL_NEW" } ``` Despite specifying `"returnValues": "ALL_NEW"`, the response I'm getting from the mutation looks like this: ```json { "data": { "createPost": { "id": "1", "title": "New Post", "content": "This is a new post." } } } ``` Instead of the updated item, I am just seeing the input values. I've double-checked that the `Post` type is correctly defined in the schema, and the DynamoDB table does have the right IAM permissions for AppSync. I even tried explicitly setting the `DynamoDB` resolver to return the item after the mutation, but still no luck. I also have this behavior in the AppSync logs when I run the mutation: `behavior: Unable to return the updated item after mutation.` Can anyone guide to understand why I'm not getting the expected output and how I can resolve this scenario? I’m using AWS Amplify with version 4.3.0 for this project. Any help would be greatly appreciated! I'm using Javascript 3.11 in this project. I've been using Javascript for about a year now. Is there a better approach? For reference, this is a production CLI tool. Has anyone dealt with something similar?