Rails fields_for表单没有显示

时间:2013-04-16 01:00:09

标签: ruby-on-rails ruby ruby-on-rails-3

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 :discounts更改为has_many :discount,则表单会显示(当我尝试提交时会出现质量分配错误。)

关于为什么表单不在fields_for块中呈现以及为什么在更改复数时它会呈现的任何想法?

3 个答案:

答案 0 :(得分:7)

您想要多次折扣或一次折扣?

@product.build_discount用于has_one关联,但其余代码用于has_many

如果您想要许多折扣,请将其更改为@product.discounts.build

否则,如果您只想一个折扣,请更改以下内容:

f.fields_for :discount do |discount_form|accepts_nested_attributes_for :discount为单数。

@products.discounts.build将无效,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

答案 1 :(得分:0)

如何将局部变量product传递给_edit_product.html.erb部分?我猜你有一个new.html.erb视图,你在哪里渲染你的部分?

答案 2 :(得分:0)

使用@ mind_blank的答案,我写了这个解决方案:

@products = current_user.products.each {|product| product.discounts.build}

该表格出现在此行之后。