ruby-on-rails - rails accepts_nested_attributes_for :reject_if not working

Question

我放弃尝试覆盖 autosave参数，因为我认为它无法完成。
我搬了has_shipping_address来自 Order到 ShippingAddress模型，现在我有:

#the models..
class Order < ActiveRecord::Base

  belongs_to :billing_address
  belongs_to :shipping_address 

  accepts_nested_attributes_for :billing_address
  accepts_nested_attributes_for :shipping_address, :reject_if => proc { |attributes| attributes["has_shipping_address"] != '1' }

  def after_initialize                       
    self.build_billing_address unless billing_address
    self.build_shipping_address unless shipping_address
  end

end

class ShippingAddress < OrderAddress
  attr_accessor :has_shipping_address  
end

class OrderAddress < ActiveRecord::Base
  validates_presence_of :name
  #more validations here..
end   

#the view
<% form_for @order do |f| %>
  #...
  <% f.fields_for :shipping_address do |addr_f| %>
    <%= addr_f.check_box :has_shipping_address %>
    <%= addr_f.text_field :name %>
    #more fields for the address..
  <% end %>
<% end %>

问题是:reject_if似乎没有完成它的工作。不管 has_shipping_address 的值是多少是，save仍然在嵌套的 ShippingAddress 上调用方法，导致验证错误。

我在这里做错了吗？这有点令人沮丧。

Answer 1

结果是 :reject_if没有工作，因为我正在构建嵌套 shipping_address在 after_initialize订单回调。
将其移动到 View (或辅助方法)后，它按预期工作。

def after_initialize                       
  self.build_billing_address unless billing_address
end

#the view is now
<% form_for @order do |f| %>
  #...
  <% @order.build_shipping_address unless @order.shipping_address %>
  <% f.fields_for :shipping_address do |addr_f| %>
    <%= addr_f.check_box :has_shipping_address %>
    <%= addr_f.text_field :name %>
    #more fields for the address..
  <% end %>
<% end %>

我希望至少这也会对其他人有所帮助，因为弄清楚这一点让我非常沮丧。