我如何使nested_attributes在Rails3中工作？ [英] How do I make nested_attributes work in Rails3?

问题描述

以下是我的用户模型：

  class User< ActiveRecord :: Base 
 has_one：teacher，：dependent => ：销毁
 accept_nested_attributes_for：teacher，：allow_destroy => true 
 attr_accessible：email，：password，：password_confirmation，：remember_me，：teacher_attributes 
 end 
  

这是我的老师模型：

  class Teacher< ActiveRecord :: Base 
 belongs_to：user 
 attr_accessible：user_id，：first_name，：last_name 
 validates_presence_of：user_id，：first_name，：last_name 
 end 
  
 
 
 
这是我的表单：
 < ;％= form_for（@user，：url => registration_path（：user））do | user | ％GT; 
 
 
<％= user.text_field：email％> 
<％= user.text_field：password％> 
<％= user.text_field：password_confirmation％> 
 
 
<％= user.fields_for resource.build_teacher do | t | ％GT; 
<％= t.text_field：first_name％> 
<％= t.text_field：last_name％> 
<％= t.text_field：phone％> 
<％end％> 
 
<％= user.submit'确认'％> 
<％end％> 
  
除了这个东西不会接受嵌套属性
我的开发日志说： 
 警告：无法批量分配受保护的属性：teacher 
  
我不知道它是否相关，但表单不是在teacher_attributes数组或其他任何内部生成字段 - 而是在教师内部。我猜这就是我的问题所在，但我不知道如何将它放在里面。请帮助。
 
 
 
谢谢！      试试这些东西：
 
 
 
在视图顶部： 
 
 
 <％@ user.build_teacher如果@ user.teacher.nil？ ％GT; 
  
以下字段： 
 
 
 <％= user.fields_for：teacher do | t | ％GT; 
  
另外，我个人喜欢用表单命名块参数（ （因为当你''c $ c> c | c | c | c | c | c | c | c | c | c | c | c |重新过了很长的一天，并且你在视图中看到 user 而不是 form ，它会让你感到困惑！）  
Here's my user model:
class User < ActiveRecord::Base
  has_one :teacher, :dependent => :destroy
  accepts_nested_attributes_for :teacher, :allow_destroy => true
  attr_accessible :email, :password, :password_confirmation, :remember_me, :teacher_attributes
end
Here's my teacher model:
class Teacher < ActiveRecord::Base
  belongs_to :user
  attr_accessible :user_id, :first_name, :last_name
  validates_presence_of :user_id, :first_name, :last_name
end
Here's my form:
<%= form_for(@user, :url => registration_path(:user)) do |user| %>


        <%= user.text_field :email %>
        <%= user.text_field :password %>
        <%= user.text_field :password_confirmation %>


    <%= user.fields_for resource.build_teacher do |t| %>
            <%= t.text_field :first_name %>
            <%= t.text_field :last_name %>
            <%= t.text_field :phone %>
    <% end %>

      <%= user.submit 'Confirm' %>
<% end %>
Except that this thing won't "accept nested attributes"
My development log says:
WARNING: Can't mass-assign protected attributes: teacher
I don't know if it's related, but the form isn't generating fields inside a teacher_attributes array or anything - it's inside teacher. I'm guessing that's where my problem is, but I don't how to make it put the fields inside it. Please help.


Thanks!
解决方案
Try these things:

At top of view:
<% @user.build_teacher if @user.teacher.nil? %>
For the fields for:
<%= user.fields_for :teacher do |t| %>
Also, personally, I like naming the block parameters in forms (the part |user| and |t|) as |form| (because when you're having a long day, and you see user down in the view and not form, it can confuse you!)

                        
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