Rails GraphQL嵌套变异/查询结构

# Gemfile
gem 'graphql'

# app/graphql/schema.rb
class ApplicationSchema < GraphQL::Schema
  query Types::QueryType
  mutation Types::MutationType
end

# app/graphql/types/query_type.rb
class Types::QueryType < Types::BaseObject
  field :users, [Types::UserType], null: false do
    argument :ids, [ID], required: true
  end

  def users(ids:)
    User.where(id: ids)
  end
end

# app/graphql/types/mutation_type.rb
class Types::MutationType < Types::BaseObject
  field :create_user, mutation: Mutations::CreateUser
end

# app/graphql/mutations/create_user.rb
class Mutations::CreateUser < Mutations::BaseMutation
  argument :name, String, required: true
  argument :email, String, required: true

  field :user, Types::UserType, null: false
  field :errors, [String], null: false

  def resolve(name:, email:)
    user = User.new(name: name, email: email)
    if user.save
      {
        user: user,
        errors: []
      }
    else
      {
        user: nil,
        errors: user.errors.full_messages
      }
    end
  end
end

# config/routes.rb
Rails.application.routes.draw do
  post '/graphql', to: 'graphql#execute'
end

# app/controllers/graphql_controller.rb
class GraphqlController < ApplicationController
  def execute
    result = ApplicationSchema.execute(
      params[:query],
      context: { current_user: current_user },
      variables: params[:variables]
    )

    render json: result
  end
end