Question

我试图创建两种类型的地址：获取地址和送货地址。为此，我创建了一个与列表和订单相关联的多态地址模型。我想在列表和订单视图中使用字段创建新地址。出于某种原因，这仅在我创建列表时有效，当我尝试创建订单时，我会得到未定义的方法＆＃39;地址＆＃39;对于模型订单。

注意：以下摘录中省略了不相关的代码。

address.rb

class Address < ApplicationRecord
 belongs_to :addressable, polymorphic: true, optional: true
end

listing.rb

class Listing < ApplicationRecord
 has_many :orders
 has_one :pickup_address, as: :addressable, class_name: "Address", dependent: :destroy

 accepts_nested_attributes_for :pickup_address
end

order.rb

class Order < ApplicationRecord
 belongs_to :listing
 has_one :delivery_address, as: :addressable, class_name: "Address", dependent: :destroy

 accepts_nested_attributes_for :delivery_address
end

在我的表单视图中我有

应用/视图/列表/ _form.html.erb

<%= form_for(setup_listing(@listing)) do |f| %>
 <%= f.label :description %>
 <%= f.text_area :description, class: 'form-control' %>

 <%= f.label :price %>
 <%= f.text_field :price, class: 'form-control' %>

 <%= f.fields_for :pickup_address do |u| %>

    <%= u.label :city %>
    <%= u.text_field :city, class: 'form-control' %>

    <%= u.label :sector %>
    <%= u.text_field :sector, class: 'form-control' %>

    <%= u.label :line_1 %>
    <%= u.text_field :line_1, class: 'form-control' %>

    <%= u.label :line_2 %>
    <%= u.text_field :line_2, class: 'form-control' %>

   <% end %>
 <%= f.submit "submit", class: "btn btn-primary" %>
<%end%>

应用/视图/命令/ _form.html.erb

<%= form_for([@listing, setup_order(@order)]) do |f| %>
  <%= f.fields_for :delivery_address do |u| %>

  <%= u.label :city %>
  <%= u.text_field :city, class: 'form-control' %>

  <%= u.label :sector %>
  <%= u.text_field :sector, class: 'form-control' %>

  <%= u.label :line_1 %>
  <%= u.text_field :line_1, class: 'form-control' %>

  <%= u.label :line_2 %>
  <%= u.text_field :line_2, class: 'form-control' %>

  <% end %>
 <%= f.submit "submit", class: "btn btn-primary" %>
<%end%>

请注意，在form_for函数中，我使用方括号，因为我从列表中构建了订单。

的routes.rb

Rails.application.routes.draw do
  resources :listings do
     resources :orders
  end
end

setup_order / listing函数来自

应用/助手/ form_helper.rb

 module FormHelper

    def setup_listing(listing)
      listing.build_pickup_address if listing.pickup_address.nil?
      listing
    end

    def setup_order(order)
       order.build_delivery_address if order.delivery_address.nil?
       order
    end

 end

我用来创建新地址，以防这个地址不存在this tutorial中的建议。

我确保将地址属性添加到控制器中的params

listings_controller.rb

  def create
    @listing = current_user.listings.build(listing_params)
    if @listing.save
      flash[:success] = "listing created!"
      redirect_to @listing
    else
      render 'new'
    end
  end
   .
   .

  private

  def listing_params
   params.require(:listing).permit(pickup_address_attributes: [:city,   :sector,:line_1, :line_2])
  end

orders_controller.rb

   .
   .
   def create
     @listing = Listing.find(params[:listing_id])
     @order = @listing.orders.build(order_params)
     if @order.save
       redirect_to listings_path
     else
      render 'new'
     end
   end
   .
   .
   private

   def order_params
     params.require(:order).permit(delivery_address_attributes: [:city, :sector, :line_1, :line_2])
   end

再次，创建列表完美无缺。当我尝试创建新订单时会发生问题。先谢谢！

FUll trace

activemodel (5.0.0) lib/active_model/attribute_methods.rb:433:in `method_missing'
activemodel (5.0.0) lib/active_model/validator.rb:149:in `block in validate'
activemodel (5.0.0) lib/active_model/validator.rb:148:in `each'
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activesupport (5.0.0) lib/active_support/callbacks.rb:405:in `public_send'
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Answer 1

在找不到我的问题的任何答案后，我很想改变从has_one到has_many的关系，设置默认属性名称，以查看该错误是否已更改。

class Order < ApplicationRecord

  belongs_to :listing
  has_many :addresses, as: :addressable, dependent: :destroy

  accepts_nested_attributes_for :delivery_address

end

我也在我的控制器和视图中进行了更改，但我再次没有找到方法＆＃39;地址＆＃39;而不是地址＆＃39;本来应该的。然后我意识到在某个地方我必须有写地址所以我搜索了@eeeeeean建议并且确实在验证中（我在问题中省略了考虑它们无关紧要）我仍然有一个地址验证，这里是模型的实际代码。

class Order < ApplicationRecord
  validates :address, :seller_id, :buyer_id, :listing_id, presence: true  

  belongs_to :listing
  belongs_to :buyer, class_name: "User"
  belongs_to :seller, class_name: "User"

  has_one :delivery_address, as: :addressable, class_name: "Address", dependent: :destroy

  accepts_nested_attributes_for :delivery_address

  enum status: [ :ordered, :shipped, :delivered, :rated ]

end

因此，请避免在问题中省略代码，并确保检查通常不会执行此操作的地方。

未定义的方法＆＃39;嵌套属性＆＃39;对于模型

1 个答案: