尝试使用GraphQL Ruby进行类型定义

這篇文章是「試試GraphQL2-在Ruby中試試GraphQL」的續篇。
我參考過官方的以下頁面。

如果仔细阅读的话，仅凭这个就足够了，但由于一开始有个奇怪的误解，所以还是先把示例代码作为备忘录进行记录。

require 'graphql'

class User < GraphQL::Schema::Object
  field :id, ID, null:true
  field :name, String, null:true
end

class QueryType < GraphQL::Schema::Object
  field :user, User, null:true
  def user()
    {'id'=>123, 'name'=>'Taro'}
  end
end

class Schema < GraphQL::Schema
  query QueryType
end

puts Schema.execute('query { user {name} }').to_json

$ bundle exec ruby type.rb
{"data":{"user":{"name":"Taro"}}}

请参考以下页面获取标量类型的相关信息。

与Sinatra整合在一起

source "https://rubygems.org"

gem "sinatra"
gem "sinatra-contrib"
gem 'rack-contrib'
gem "graphql"

require 'graphql'
require 'sinatra'
require 'sinatra/json'
require 'rack/contrib'
use Rack::PostBodyContentTypeParser

class User < GraphQL::Schema::Object
  field :id, ID, null:true
  field :name, String, null:true
end

class QueryType < GraphQL::Schema::Object
  field :user, User, null:true
  def user()
    {'id'=>123, 'name'=>'Taro'}
  end
end

class Schema < GraphQL::Schema
  query QueryType
end

post '/graphql' do
  json Schema.execute(params[:query], variables: params[:variables]).to_json
end

$ bundle exec ruby hoge.rb
[2019-06-09 21:20:09] INFO  WEBrick 1.3.1
[2019-06-09 21:20:09] INFO  ruby 2.3.3 (2016-11-21) [x86_64-linux-gnu]
== Sinatra (v2.0.5) has taken the stage on 4567 for development with backup from WEBrick
[2019-06-09 21:20:09] INFO  WEBrick::HTTPServer#start: pid=2437 port=4567

$ curl -H 'Content-type: application/json' -X POST http://localhost:4567/graphql -d '{ "query" : "query { user {name} }" }'
"{\"data\":{\"user\":{\"name\":\"Taro\"}}}"%