rails 4质量分配

Question

我有：

• 通用数据(如电子邮件、密码、first_name、last_name )的模型用户
• 特定数据(如faculty_id等)的模型学生。

我想要的是有可能修改学生的档案，例如改变它的教员和证书。我发现accepts_nested_attributes_for应该在这方面帮我。这就是我所拥有的：

class User < ActiveRecord::Base

 has_one :student
 has_one :header
 has_one :admin
 has_many :progresses, :through => :student

 accepts_nested_attributes_for :student

end

class Student < ActiveRecord::Base

  belongs_to :user
  belongs_to :group
  has_one :specialization, through: :group
  has_many :progresses
  scope :activated, lambda {(where("users.activated = 'off'"))}
  self.per_page = 1

end

class Admin::StudentsController < AdminController

 before_action :set_user, only: [:show, :edit, :update, :destroy]

  def index
    @students = Student.joins(:user).joins(:group).paginate(:page => params[:page]).all
  end

  def show
  end

  def edit
  end

  def update
  end

  private
   def set_user
    @student = Student.find(params[:id])
    @student.build_user
   end
end

形式部分

= form_for([:admin,@student]) do |f|
 - if @student.errors.any?
  #error_explanation
   h2
    = pluralize(@student.errors.count, "error")
    | prohibited this group from being saved:
   ul
    - @student.errors.full_messages.each do |msg|
      li= msg
  .field
   = f.fields_for :user do |builder|
   = builder.label :first_name
  br/
   = builder.text_field :first_name
  .field
  = f.label :faculty_id
  br/
  = f.text_field :faculty_id
.actions
= f.submit

我在浏览器中查看了检查元素，用户对象的输入是

<input id="student_user_first_name" name="student[user][first_name]" type="text">

这似乎是对的。但是田野是空的。请告诉我哪里出了问题？谢谢。

Answer 1

Rails 4使用强参数，因此需要在控制器中白化您的params。这里有一个很好的解释，它考虑了accepts_nested_attribute_for的使用。http://edgeapi.rubyonrails.org/classes/ActionController/StrongParameters.html