在Rails中从父模型传递值

Question

我使用Ruby on Rails 5.2.3，Mongoid和Devise

我有两个模型，我需要从父模型传递button_color值

user.rb

class User
  include Mongoid::Document

  field :button_color, type: String, default: '#FFFFFF'

  has_many :items, dependent: :destroy

end

item.rb

class Item
  include Mongoid::Document

  field :button_color, type: String
  belongs_to :user, touch: true
end

我需要得到类似的东西

field：button_color，类型：字符串，默认值：current_user.button_color

Answer 1

class Item
  belongs_to :user

  delegate :button_color, to: :user
end