（Rails）如何以父母的形式显示子记录（一对多）？ [英] (Rails) How to display child records (one-to-many) in their parent's form?

问题描述

我有一个包含不同类型产品的类别表，所以我在category.rb中创建了这个表：

  class Category< ActiveRecord :: Base 
 has_many：产品
结束
  

此产品。 rb：

  class产品< ActiveRecord :: Base 
 belongs_to：categories 
 end 
  

我想知道我怎么才能从products / new.html.erb中获取产品的类别：

解决方案

编辑：简化代码 p>

我建议您使用 Formtastic ，它自动为你 。如果你想在没有Formtastic的情况下使用rails，解决方案是：

假设你对 new.html.erb 和 edit.html.erb ，代码将进入 _form.html.erb

 <％= f.label：category_id％>< br /> 
 <％= f.collection_select：category_id，Category.all，：id，：name％> 
  

I have a "category" table that contains different kind of "product", so I create this in the category.rb:

class Category < ActiveRecord::Base
  has_many :products
end

And this in product.rb:

class Product < ActiveRecord::Base
  belongs_to :categories
end

I would like to know how can I get the :categories from the product in the products/new.html.erb

解决方案

EDIT: Simplified code

I recommend that you use Formtastic which will do it automatically for you. If you want to do it rails without Formtastic, solution is:

Assuming you are using partial for new.html.erb and edit.html.erb, the code will go into _form.html.erb

<%= f.label :category_id %><br />
<%= f.collection_select :category_id, Category.all, :id, :name%>

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