A simple way to convert GraphQL queries to REST in order to use any HTTP client for performing a request.

There are 2 main things for working with graphql_2_rest library: GraphQLQueryModel and GraphQLQueryBuilder.

1. GraphQLQueryModel is responsible for putting arguments in GraphQL query. For example, if you have a query:

const query = '''query {
  user(first_name: %arg, age: %arg) {
    first_name
    last_name
    site {
      site_name
    }
  }
}''';

then you need to create next GraphQLQueryModel:

class UserQueryModel with GraphQLQueryModel {
  const UserQueryModel(
    this.age,
    this.firstName,
  );
  
  final int age;
  final String firstName;
  
  @override
  List<String> get arguments => ['"$firstName"', '$age'];
}

2. GraphQLQueryBuilder will replace all arguments consistently in the query using GraphQLQueryModel. By default, GraphQLQueryBuilder uses %arg mask for arguments, but it can be changed while creating instance of this class. Finally you can use any HTTP client for performing a request, but the request have to be POST:

final dio = Dio(BaseOptions(baseUrl: 'https://endpoint/'));
const queryBuilder = GraphQLQueryBuilder();
dio.post<dynamic>(
  'graphql/',
  data: queryBuilder.build(
    query, 
    UserQueryModel('John', 27),
  ),
);