accepts_nested_attributes_for 在 Rails 3 中的实际使用形式 [英] accepts_nested_attributes_for practical form use for in Rails 3

问题描述

使用 Ruby on Rails 3:

Using Ruby on Rails 3:

我不太了解 accepts_nested_attributes_for 是如何应该工作的，但我想不出一种实用的方法来在表单中实现它.例如，如果有人想在他们的用户页面中添加他们最近的位置:

I semi-understand how accepts_nested_attributes_for is supposed to work, but I can't figure out a practical way to implement this in a form. For example, if someone wanted to add their most recent locations in their user page:

user.rb

class User < ActiveRecord::Base
  has_many :locations
  accepts_nested_attributes_for :locations
end

location.rb

class Location < ActiveRecord::Base
  belongs_to :user
end

位置表

location
  -location
  -length_of_stay
  -user_id

关于我如何在用户视图_form.html.erb中实际实现这一点的任何想法?文档没有讨论任何关于视图的内容.

Any ideas on how I go about implementing this practically in the user view _form.html.erb? The documentation doesn't talk anything about the view whatsoever.

我尝试使用 railscast 教程，但它没有任何效果——我相信该演员表是为 rails 2.3 制作的，但我不确定 3 中是否有不同的用法.

I tried using the railscast tutorial but it did not work whatsoever -- I believe the cast was made for rails 2.3, but I'm not sure if there's different usage in 3.

推荐答案

accepts_nested_attributes 需要实现的情况，当你有一些链接的模型并希望以一种形式创建和编辑它们.
例如:用户及其位置

accepts_nested_attributes need to implement situation when you have some chained models and want to create and edit them in one form.
For example: Users and their Locations

这是很常见的情况，并且被广泛使用.例如:

This is common situation and it's used widely. For example:

<%= form_for @user, users_path do |form| %>
 <%= form.text_field :name %>
 <%= form.fields_for :locations do |f| %>
   <%= f.text_field :location %>
     ...
 <% end %>
<%= form.submit %>
<% end %>

您应该阅读:http://api.rubyonrails.org/ 关于 ActiveRecord::NestedAttributes::类方法

You should read: http://api.rubyonrails.org/ about ActiveRecord::NestedAttributes::ClassMethods

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