ruby-on-rails – Rails fields_for表单没有显示

发布时间：2020-12-17 01:25:31 所属栏目：百科来源：网络整理

导读：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

products_controller.rb

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？

解决方法

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

（编辑：李大同）

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