products_controller.rb def new @product = Product.new @product.build_discountend product.rb has_many :discounts, :dependent = :destroyaccepts_nested_attributes_for :discountsattr_accessible :discounts_attributes discount.rb belongs_to :prod
def new @product = Product.new @product.build_discount end
product.rb
has_many :discounts, :dependent => :destroy accepts_nested_attributes_for :discounts attr_accessible :discounts_attributes
discount.rb
belongs_to :product
_edit_product.html.erb
<%= form_for(product, :html => { :multipart => true }, :remote => true) do |f| %>
// STUFF
<%= f.fields_for :discounts do |discount_form| %>
//does not show up
<% end %>
<% end %>
fields_for块中的内容未显示.但是,如果我将has_many：discount更改为has_many：discount,则表单显示(当我尝试提交时获取批量分配错误).
关于为什么表单不在fields_for块中呈现以及为什么在我更改复数时它会呈现的任何想法？
你想要很多折扣或一个折扣吗？@ product.build_discount用于has_one关联,但其余代码用于has_many
如果您想要很多折扣,请将其更改为@ product.discounts.build
否则,如果您只想享受一次折扣,请更改以下内容：
f.fields_for：discount do | discount_form |和accepts_nested_attributes_for：单数折扣.
@ products.discounts.build将无法工作,因为您无法从对象集合中获取关联.例如：
@products = Product.all @discount = @products.discounts.build # This won't work! You'll get an error @product = Product.find(params[:id]) @discount = @product.discounts.build # This will work, since you're running it on a single instance of Product