使用 accept_nested_attributes_for (b/t & has_many) 以单一形式创建单独的模型

Question

尝试使用嵌套属性以一种形式创建Organization 和User。我收到以下错误：Can't mass-assign protected attributes: user (ActiveModel::MassAssignmentSecurity::Error)

把我的头发拉到这个上

organization.rb

class Organization < ActiveRecord::Base  
  attr_accessible :name, :users_attributes
  has_many :users, dependent: :destroy      
  accepts_nested_attributes_for :users  
end

user.rb（使用设计）

class User < ActiveRecord::Base
  attr_accessible :email     
  belongs_to :organization
end

new.html.haml

= form_for @organization do |f|

  = f.label :name, "Company Name"
  = f.text_field :name, placeholder: "Company Name"

  = f.fields_for :user do |ff| -# tried :users here and the form doesn't render
    = ff.label :email, "Email Address"
    = ff.email_field :email, placeholder: "Email Address"

= f.submit "Create Account"

Answer 1

这在 Stackoverflow 上得到了很多回答。

f.fields_for :users

而在控制器中，你需要建立一个用户：

@organization.users.build

您得到Can't mass-assign protected attributes: user，因为用户属性不可访问，因为它不存在。