query method

Future<Map<String, dynamic>> query(String query, { Map<String, dynamic>? variables, })

Execute a GraphQL query with optional variables; returns the data object. Throws GraphQLException if the response carries errors.

Implementation

Future<Map<String, dynamic>> query(
  String query, {
  Map<String, dynamic>? variables,
}) async {
  final resp = await _dio.post<Map<String, dynamic>>(
    endpoint,
    data: {
      'query': query,
      if (variables != null) 'variables': variables,
    },
    options: Options(
      contentType: 'application/json',
      responseType: ResponseType.json,
      headers: {'accept': 'application/json', ...headers},
      validateStatus: (_) => true,
    ),
  );

  final body = resp.data;
  if (body == null) {
    throw GraphQLException(
      'Empty GraphQL response (HTTP ${resp.statusCode})',
      const [],
    );
  }

  final errors = body['errors'];
  if (errors is List && errors.isNotEmpty) {
    final messages =
        errors.map((e) => (e is Map ? e['message'] : e).toString()).toList();
    throw GraphQLException(messages.join('; '), messages);
  }

  final data = body['data'];
  if (data is! Map<String, dynamic>) {
    throw GraphQLException('GraphQL response missing "data"', const []);
  }
  return data;
}