graphql-blog-schema-with-post-and-author

// データ
import PostsList from './data/posts';
import AuthorsList from './data/authors';

// GraphQLのデフォルト型
import {
  GraphQLString,
  GraphQLList,
  GraphQLObjectType,

  GraphQLNonNull,
  GraphQLSchema
} from 'graphql';

/**
  独自型
**/

// Author
const Author = new GraphQLObjectType({
  name: "Author",
  description: "This represents an author",
  fields: () => ({
    _id: {type: new GraphQLNonNull(GraphQLString)},
    name: {type: GraphQLString}
  })
})

// Post type
const Post = new GraphQLObjectType({
  name: "Post",
  description: "This represents a Post",
  fields: () => ({
    _id: {type: new GraphQLNonNull(GraphQLString)},
    title: {
      type: new GraphQLNonNull(GraphQLString),
      resolve: function(post) {
        return post.title || "Does not exist"
      }
    },
    author: {
      type: Author,
      resolve: function(post) {
        // 受け取ったPostとマッチするAuthorを返す。
        return AuthorsList.find(a => a._id == post.author)
      }
    },
    content: {type: GraphQLString}
  })
})

// ルートクエリ
const Query = new GraphQLObjectType({
  name: 'BlogSchema',
  description: 'Root of the Blog Schema',
  fields: () => ({
    posts: {
      type: new GraphQLList(Post),
      resolve: function() {
        return PostsList
      }
    }
  })
});

// The Schema
const Schema = new GraphQLSchema({
  query: Query
});