ruby-on-rails - 如果 has_many child 无效，则引发验证错误

Question

我有一个 has_many 的问题在所有 child 都有效之前不应验证的关联。

设置

rails g scaffold Hotel name
rails g scaffold RoomCategory name hotel:references

应用程序/模型/hotel.rb

class Hotel < ActiveRecord::Base
  has_many :room_categories, dependent: :destroy

  accepts_nested_attributes_for :room_categories,
                                :reject_if => 
                                proc {|attributes| attributes['name'].blank?},
                                allow_destroy: true
end

应用程序/模型/room_category.rb

class RoomCategory < ActiveRecord::Base
  belongs_to :hotel

  validates :name,
            presence: true,
            uniqueness: { scope: :hotel }
end

这个想法是给定的 hotel不能有两个room_categories同名。

题

我如何确保以下hotel示例不验证为真？

>> hotel = Hotel.new(name: 'Example')
>> hotel.room_categories.build(name: 'Suite')
>> hotel.room_categories.build(name: 'Suite')
>> hotel.save
>> hotel.valid?
=> true

谢谢!

Answer 1

尝试这个..

accepts_nested_attributes_for :room_categories, :reject_if => lambda { |a|  a[:name].blank?  }, :allow_destroy => true