I'm more than willing to submit a PR for this, and to help with the development of this package.
I've written a GraphQL parser and GraphQL type implementation package for Dart, and am trying to get some server-side and cross-platform implementations going:

• https://github.com/angel-dart/graphql
• https://github.com/thosakwe/graphql

So I anticipate myself using the client a lot.

That being said, dart:mirrors can potentially cause a code size bloat via dart2js, and is entirely unsupported by Flutter. A potential solution might be some sort of code generation?

when value of resolved field is List type, met error:

E/flutter (28080): type 'List<dynamic>' is not a subtype of type 'Map<dynamic, dynamic>'
E/flutter (28080): #0      GQLClient._resolve (package:graphql_client/src/client.dart:168:31)
E/flutter (28080): #1      GQLClient._resolveFields (package:graphql_client/src/client.dart:122:9)
E/flutter (28080): #2      GQLClient._resolveQuery (package:graphql_client/src/client.dart:115:5)
E/flutter (28080): #3      GQLClient.execute (package:graphql_client/src/client.dart:70:7)
...

my GraphQL query is:

query ActivitiesQuery {
   activities {
      id
   }
 }

and the http response body is:

{
  "data": {
    "activities": [
      {
        "id": "cjjb31t5rdjp701200999b2r1"
      }
    ]
  }
}

I noticed there is the ScalarCollection abstract class(mixin) and maybe it was designed for GraphQL pagination purpose.

Am I missing something how to handle value of List type field that is not follow GraphQL pagination format ? thx a lot.

Hi, I contacted you via email. I'd love to continue this work, and include support for https://github.com/jaydenseric/graphql-upload as well

Nice library btw!

I am new to Dart... any hints on why? thx. Billy.

On this line: The IDE gives me a warning of Invalid Override.
OperationType get type => OperationType.query;

At runtime:
malformed type: line 93 pos 3: cannot resolve class 'OperationType' from 'ViewerBioQuery' OperationType get type => OperationType.query; ^

https://github.com/dart-lang/mono_repo/tree/master/mono_repo

Make it easier to set up travis, etc

Visiting https://pub.dartlang.org/packages/graphql_client at the bottom there is a link to the ROADMAP.md file which is gone?

GraphQL doesn't have to be served over http. In Apollo, they have abstracted the network client away, while providing a default implementation. This is great for things like testing, support for subscriptions over websockets, or any other customization the user wants to make without having to support it in this library.

I would like this abstraction so that I could build a graphql server in dart to act as a proxy to the real graphql server. I would store all mutations while off network and handle them in dart, then next time the network is back online, I would send all of them to the real server.

I don't think this library should be responsible for this kind of functionality, so I think the network abstraction would be the best option.

As I know dart team will deprecate transformer API favor to builder api. Like https://github.com/google/built_value.dart I think it would be great if it ll be builder from the beginning

Hey! Thanks for creating that lib. I'm going to look into at once I'm more familiar with the basics of dart again. It's been a long time...

I want to learn about your approach to create the queries like this:
https://github.com/hourliert/graphql_client/blob/716ddcae1b33a7400c99dd89fc96a0a6b0a948a6/example/graphql_client_example.dart#L27-L39

IMO it's way better to use simple string queries, run them and after getting the response marshall them into the objects you'd like to work with.
What makes this so much better to work with, is the fact that you can actually write the queries in GraphiQL and just copy & paste them over into your code. This is just not possible with the current approach and thus probably error prone.

Cheers 🍻

This issue will be used to test mutations.

I'm currently trying to run a mutation, which doesn't return locations, if there was an error.
Unfortunately, it seems like locations is required in case there was an error.

NoSuchMethodError: The method 'map' was called on null.
Receiver: null
Tried calling: map(Closure: (dynamic) => Location)
#0      Object.noSuchMethod (dart:core/runtime/libobject_patch.dart:46:5)
#1      new GQLError.fromJSON (package:graphql_client/src/exceptions.dart:39:33)
#2      new GQLException.<anonymous closure> (package:graphql_client/src/exceptions.dart:61:44)
#3      MappedListIterable.elementAt (dart:_internal/iterable.dart:414:29)
#4      ListIterator.moveNext (dart:_internal/iterable.dart:343:26)
#5      new List.from (dart:core/runtime/libarray_patch.dart:51:29)
#6      new GQLException (package:graphql_client/src/exceptions.dart:61:7)
#7      GQLClient._parseResponse (package:graphql_client/src/client.dart:109:17)
#8      GQLClient.execute (package:graphql_client/src/client.dart:65:20)

Query:

mutation($username: String!, $password: String!) {
  createToken (username: $username, password: $password) { 
  	token
  }
}

Response:

{
  "data": {
    "createToken": null
  },
  "errors": [
    {
      "message": "Username and password required.",
      "path": [
        "createToken"
      ]
    }
  ]
}

Successfull request work as expected.
I've tried to modify exceptions.dart, but without luck. (Just started with Dart a few days ago.)

Could you make an example where you don't use an endpoint url ?

The reason is because I have to write plugins in golang and wrap in Java and swift. Graphql is a really nice way to avoid having to write a ton of java and swift code on a large API.
So from flutter I just call a single method and it passes through to the golang layer which then sees the query and does it's thing and returns the graphql response
It's not the fastest but it's convenient.
It's also kind of nice because I can use the same technique for making server caller from flutter also, which is when of course I do need an endpoint

Inside the plugin I use golang which has pretty good graphql support including resolvers.

If you want more info just ask.
If your super busy just say and I can try to do it myself and publish and example.