How to get error response from hasura graphql query in iOS

Question

I am using hasura for queries.

    ApolloNetworkClass.shared.apolloClient.fetch(query: GetCollectionsQuery(user_id: "120"), cachePolicy: .fetchIgnoringCacheData) { (result) in
        switch result
        {
        case .success(let result) :
            if let array = result.data?.nftCollections.map({$0.fragments.nftCollectionsModel})
            {
                self.collectionList = array
                
                self.tblCollections.reloadData()
            }
            else if let error = result.errors {
                if let errorResponse = error.first {
                    print(errorResponse)
                } else {
                    print("[Error] Got errors when call request: \(error)")
                }
            }
            break
        case .failure(let error) :
            Utility.ShowToast(message: error.localizedDescription, position: .top)
            print(error)
            break
        }
    }

Here is my query and I just want to get error code or response code (like 401).

I have tried everything, but I am unable to get solutions.

Thanks in advance.

score 0 · Answer 1 · answered Jul 29 '21 at 08:16

GraphQL error responses will still return a status code 200, unlike the REST API pattern where you will receive a 4xx if something goes wrong.

In order to parse the error message, you will need to look into the response object which would be of the format:

{
  "data": ....,
  "errors": []
}

You can then expand on the errors object which will contain information like the error code, location of the error via some path etc.

How to get error response from hasura graphql query in iOS

1 Answers1