GraphQL query works in appsync console but not on client about amplify-swift

[thisisabhash]

Thank you posting this issue - our team will investigate and post updates on this ticket.

[lawmicha]

Hi @ip5038, I could not reproduce this issue, but as I was trying out the code snippet, I made a few changes to get it to work.

Task {
    do
    {
        let model = MyModel.keys
        let predicate = model.post_id == "1" && model.user_id == "1"
        let request = GraphQLRequest<MyModel>.list(MyModel.self, where: predicate, limit: 1000)

        let result = try await Amplify.API.query(request: request)
        switch result {
        case .success(let models):   // query returns .success with empty list
            if (models.count > 1) {
                print("count \(models.count)")
            }
            print(models)
            if models.hasNextPage() {
                print("Has Next Page")
                let nextPage = try await models.getNextPage()
            } else {
                print("No pages remaining")
            }
        case .failure(let error):
            print(error)
        }
    }
    catch let error
    {
        print("Error getting model by post and user id: \(error)")
    }
}

• I noticed you used the coding key model.self instead of MyModel.self- this wasn't compiling for me, i assume this was already updated on your end
• Added a few more print statements. case .failure(let error) is when there's a successful network request but categorized as a failure when there is a GraphQL errors array, partial data/errors response, or transformation (decoding) error. Is your code going into this line?
• Added a check for hasNextPage(), this checks if the response contained the nextToken, used by getNextPage() for pagination. More details here https://docs.amplify.aws/gen1/swift/build-a-backend/graphqlapi/query-data/#list-subsequent-pages-of-items

In my amplify CLI project, i also have generatemodelsforlazyloadandcustomselectionset set to true before running amplify codegen models.

[ip5038]

It's still not working for me.

• It never goes into the failure case. It always goes to success case with an empty list of items. There are also no next pages.
• I changed generatemodelsforlazyloadandcustomselectionset to true and re-ran amplify codegen models then did clean build folder and reran the app, but still won't work.'
• The entire do-catch block is in an async function.
• I have multiple other Amplify queries and they are .get queries that query on the id field of the object. Those queries work fine.
• If I pass in post_id that doesn't exist in dynamodDB, it still return .success with empty list.

This amplify query works fine:
let result = try await Amplify.API.query(request: .get(AnotherModel.self, byId: "some_id"))

I have attached a screenshot of logs for the .list query that doesn't work. Everything that is highlighted orange is from printf() statements. Rest is from amplify logs

[ip5038]

The issue was in my logic. Query was returning only 1 item but my if-statement conditional check was if (count > 1) which failed even though there was an item. Switching my logics to if (count >= 1) fixed the issue.

Thank you for the help!

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