AWS AppSync with DynamoDB: Querying with Pagination Not Returning Expected Results
Hey everyone, I'm running into an issue that's driving me crazy. I've been banging my head against this for hours. I'm integrating AWS AppSync with DynamoDB for a project, and I'm facing issues with pagination when querying data. I'm using the `@model` directive in my GraphQL schema to connect to a DynamoDB table, and while the initial query works fine, the pagination seems to be returning unexpected results. Here's the GraphQL query I'm using: ```graphql query ListItems($nextToken: String) { listItems(nextToken: $nextToken) { items { id name } nextToken } } ``` When I call this query without a next token, it returns the first 10 items correctly. However, when I attempt to use the `nextToken` from the response to fetch the next page, I'm getting the following error message: `The provided nextToken is invalid.` This happens consistently after the first successful query. I have checked my DynamoDB table and confirmed that there are indeed more items available. I've also looked into the AppSync resolver mapping template, which seems to be correctly set up to handle pagination. Here’s the relevant resolver for the query: ```velocity #if( $ctx.args.nextToken ) #set( $token = $ctx.args.nextToken ) #else #set( $token = null ) #end #set( $limit = 10 ) { "version": "2018-05-29", "operation": "Query", "query": { "expression": "#pk = :pk", "expressionNames": {"#pk": "PK"}, "expressionValues": { ":pk": { "S": "YourPrimaryKeyValue" } } }, "nextToken": $token, "limit": $limit } ``` I've also ensured that the `AWSAppSync` SDK is up to date. This is the version I'm currently using: ```json "aws-appsync": "^4.0.0" ``` To troubleshoot, I tried logging the `nextToken` value right before making the request, and it seems to be correctly passed from the first response. However, when I log it right after the error occurs, it shows an empty string instead of the expected value. I'm not sure if this is an issue with the SDK, the resolver, or DynamoDB settings. Has anyone else encountered this issue with pagination in AWS AppSync? Any help or insights would be greatly appreciated! My development environment is Windows. I'm working on a application that needs to handle this.