Apollo-ios: Generic parameter 'Query' could not be inferred

[farice]

let apollo = ApolloClient(url: URL(string: "http://localhost:4000/graphql")!)

        apollo.fetch(query: HelloWorldQuery) { (result, error) in
            guard let data = result?.data else { return }
            print(data?.hello) // "Hello world!"
        }

with *.graphql

query HelloWorld($rolls: Int!)
{
getDie(numSides: 6) {
roll(numRolls: $rolls)
}
}

gives

Generic parameter 'Query' could not be inferred

Any ideas? Swift 4 + Xcode 9

[martijnwalraven]

You'll need to instantiate HelloWorldQuery, so you should pass something like HelloWorldQuery(rolls: 1).

[farice]

Realized this shortly after and forgot to close the issue :)

Thank you

[JulienLevallois]

I got the same error.. do you know why ?

[ankushkushwaha]

For those who still don't understand what to do just change

apolloClient?.fetch(query: query,
                            cachePolicy: .fetchIgnoringCacheData,
                            context: nil,
                            queue: DispatchQueue.main,
                            resultHandler: { result, error in
                                if let graphQLResult = result {
                                    print("Success! Result: \(graphQLResult)")
                                }

                                if let error = error {
                                    print("error!: \(error)")
                                }

to

apolloClient?.fetch(query: query,
                            cachePolicy: .fetchIgnoringCacheData,
                            context: nil,
                            queue: DispatchQueue.main,
                            resultHandler: { result in

                                switch result {
                                case .success(let graphQLResult):
                                    print("Success! Result: \(graphQLResult)")

                                case .failure(let error):
                                    print("error!: \(error)")
                                }