在graphQL查询中传递参数

时间:2019-09-18 14:53:58

标签: graphql graphql-ruby

我刚刚开始学习GraphQL,目前正在尝试创建Twitter的克隆。在下面的代码中,有没有办法我可以将81从id参数(例如user(id:81))自动传递给userId参数(例如tweets(userId:81))?

我已经在下面复制了我的代码

{
  user(id: 81) {
    username
    email
    tweets(userId: 81) {
      content
    }
  }
}

user_type.rb

module Types
  class UserType < Types::BaseObject
    field :username, String, null: false
    field :email, String, null: false
    field :bio, String, null: true
    field :tweets, [Types::TweetType], null: true do
      argument :user_id, ID, required: true
    end

    def tweets(user_id:)
      Tweet.where(user_id: user_id)
    end
  end
end

tweet_type.rb

module Types
  class TweetType < Types::BaseObject
    field :id, ID, null: false
    field :content, String, null: false
    field :userId, ID, null: false
    field :createdAt, GraphQL::Types::ISO8601DateTime, null: false
    field :user, Types::UserType, null: false
  end
end

query_type.rb

module Types
  class QueryType < Types::BaseObject
    field :tweets,
      [Types::TweetType],
      null: false,
      description: "Returns a list of all tweets"

    field :user,
      Types::UserType,
      null: false,
      description: "Returns a list of all users" do
        argument :id, ID, required: true
      end

    def tweets
      Tweet.all
    end

    def user(id:)
      User.find(id)
    end
  end
end

1 个答案:

答案 0 :(得分:0)

GraphQL具有一流的方法可将动态值从查询中分解出来,并将它们作为单独的字典(变量)传递。您将使用与下面类似的语法,并可以进一步了解here

  query User($id: Int) {
    user(id: $id) {
        username
        email
        tweets(userId: $id) {
          content
        }
     }
   }