Fields_for 设置表单无法正确使用 Accepts_nested_attributes
我确信这只是我缺乏经验，所以请耐心等待。
我有一个带有价格的模型 MenuItem。不同的项目类型（菜单项、产品、活动）可以有价格。
我的设置如下：
class MenuItem < ActiveRecord::Base
...
has_one :price, :as => :pricable
accepts_nested_attributes_for :price
attr_accessible :price_attributes
...
end
class Price < ActiveRecord::Base
belongs_to :pricable, :polymorphic => true
end
Price 对象有一个价格值，在 Mysql5 上是小数（8,2）。
在我的形式中：
<%= form_tag "/menus/save" do %>
...
<% menu_header_form.menu_items.each do |item| %>
<div><%=item['header'] %></div>
<%=text_field :menu_item, :header, :index=>item.id, :value=>item.header %>
<%=text_field :menu_item, :sort, :index=>item.id, :value=>item.sort, :size => 2 %>
<% item.fields_for :price do |menu_item_price| %>
<%= menu_item_price.text_field :price %>
<% end %>
<% end %>
并收到以下错误：
undefined method `fields_for' for #<MenuItem:0x007fec8d9be138>
我将如何迭代以获得价格值？我的模型的设置方式是否意味着这些 menu_items 默认情况下会有与其关联的价格记录（甚至是空/空值）？
谢谢
I'm sure that this is just a lack of experience on my part so bear with me.
I have a model MenuItem that has a Price. Different item types (menu_items, products, events) can have prices.
I have set it up as follows:
class MenuItem < ActiveRecord::Base
...
has_one :price, :as => :pricable
accepts_nested_attributes_for :price
attr_accessible :price_attributes
...
end
class Price < ActiveRecord::Base
belongs_to :pricable, :polymorphic => true
end
The Price object has a price value which is a decimal(8,2) on Mysql5.
In my form:
<%= form_tag "/menus/save" do %>
...
<% menu_header_form.menu_items.each do |item| %>
<div><%=item['header'] %></div>
<%=text_field :menu_item, :header, :index=>item.id, :value=>item.header %>
<%=text_field :menu_item, :sort, :index=>item.id, :value=>item.sort, :size => 2 %>
<% item.fields_for :price do |menu_item_price| %>
<%= menu_item_price.text_field :price %>
<% end %>
<% end %>
and am getting the following error:
undefined method `fields_for' for #<MenuItem:0x007fec8d9be138>
How would I iterate through to get the price value? Would the way that my models are set up mean that those menu_items would have a price record associated with them by default(even empty / null values)?
thx
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您需要
fields_for :price，而不是item.fields_for以获得更完整的示例，请查看模式 此处
所有菜单项的价格都将为空值，除非您明确给它们一个可以在 before_save 回调中执行的操作（如果您这样做）选择了
you need
fields_for :price, notitem.fields_forfor a more complete example, take a look at the pattern here
All menu items would have a null value for price unless you explicitly give them one which you could do in a before_save callback if you chose