graphql/lib/validator/rules/FragmentsOnCompositeTypes.js

A Query Language and Runtime which can target any service.

/* @flow */
/**
 *  Copyright (c) 2015, Facebook, Inc.
 *  All rights reserved.
 *
 *  This source code is licensed under the BSD-style license found in the
 *  LICENSE file in the root directory of this source tree. An additional grant
 *  of patent rights can be found in the PATENTS file in the same directory.
 */

'use strict';

var _Object$defineProperty = require('babel-runtime/core-js/object/define-property')['default'];

_Object$defineProperty(exports, '__esModule', {
  value: true
});

exports['default'] = FragmentsOnCompositeType;

var _error = require('../../error');

var _typeDefinition = require('../../type/definition');

var _errors = require('../errors');

/**
 * Fragments on composite type
 *
 * Fragments use a type condition to determine if they apply, since fragments
 * can only be spread into a composite type (object, interface, or union), the
 * type condition must also be a composite type.
 */

function FragmentsOnCompositeType(context) {
  return {
    InlineFragment: function InlineFragment(node) {
      var typeName = node.typeCondition.value;
      var type = context.getSchema().getType(typeName);
      var isCompositeType = type instanceof _typeDefinition.GraphQLObjectType || type instanceof _typeDefinition.GraphQLInterfaceType || type instanceof _typeDefinition.GraphQLUnionType;
      if (!isCompositeType) {
        return new _error.GraphQLError('Fragment cannot condition on non composite type "' + typeName + '".', [node.typeCondition]);
      }
    },
    FragmentDefinition: function FragmentDefinition(node) {
      var typeName = node.typeCondition.value;
      var type = context.getSchema().getType(typeName);
      var isCompositeType = type instanceof _typeDefinition.GraphQLObjectType || type instanceof _typeDefinition.GraphQLInterfaceType || type instanceof _typeDefinition.GraphQLUnionType;
      if (!isCompositeType) {
        return new _error.GraphQLError((0, _errors.fragmentOnNonCompositeErrorMessage)(node.name.value, typeName), [node.typeCondition]);
      }
    }
  };
}

module.exports = exports['default'];