拥有三种型号:
class Offer < ActiveRecord::Base
has_many :offer_items
end
class OfferItem < ActiveRecord::Base
belongs_to :offer
belongs_to :partner_product
accepts_nested_attributes_for :partner_product
end
class PartnerProduct < ActiveRecord::Base
has_many :offer_items
accepts_nested_attributes_for :offer_items
end
在编辑offer的表单中,有fields_for可以编辑offer_item
<% f.fields_for :offer_items do |offer_item_form| -%>
<div class='offer_item'>
<%= render :partial => 'offer_item_fields', :locals => {:offer_item_form => offer_item_form}%>
</div>
<% end -%>
部分代码块:
<%= offer_item_form.object.partner_product.name%>
抛出错误
nil:NilClass 的未定义方法“名称”
提取的源代码(第 29 行附近):
<%= offer_item_form.object.partner_product.name%>
但是当我不问名字时,就像这样
<%= offer_item_form.object.partner_product%>
<%= debug( offer_item_form.object.partner_product)%>
进入浏览器:
#<PartnerProduct:0x007fa8785ff938>
--- !ruby/ActiveRecord:PartnerProduct
attributes:
id: 1
partner_id: 586
name: a
stock_volume: 0
source_price: 0
created_at: 2012-05-31 14:05:47 Z
updated_at: 2012-05-31 14:05:47 Z
我不只是想知道,为什么我无法访问“名称”属性并将 partner_product 更改为 nil,但我真的应该展示它。欢迎任何帮助!谢谢