如何让graphql-ruby在访问子字段时使用joins？

# app/models/user.rb
class User < ApplicationRecord
  has_many :posts
end

# app/models/post.rb
class Post < ApplicationRecord
  belongs_to :user
end

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

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

# app/graphql/types/user_type.rb
class Types::UserType < Types::BaseObject
  field :id, ID, null: false
  field :name, String, null: false
  field :posts, [Types::PostType], null: true

  def posts
    object.posts.includes(:user) # 这里使用 includes 而不是 joins，因为 GraphQL-Ruby 会自动处理
  end
end