ruby-on-rails - 无法使用嵌套属性批量分配 protected 属性

Question

我以前使用过嵌套属性和 form_for，但只是缺少一些简单的东西。这是我的模型...

技能.rb

class Skill < ActiveRecord::Base
  belongs_to :tag
  attr_accessible :tag_id, :user_id, :weight
end

标签.rb

class Tag < ActiveRecord::Base
  has_many :skills
  attr_accessible :name, :skills_attributes
  accepts_nested_attributes_for :skills
end

app/views/tags/_form.html.erb

 <div class="field">
    <%= f.label :name %><br />
    <%= f.text_field :name %>
  </div>
  <%= f.fields_for :skill do |s| %>
    <%= s.label :weight %><br />
    <%= s.text_field :weight %>
  <% end %>

两个模型的参数都正常传递，但我在控制台中收到大量分配网络错误...

Started POST "/tags" for 127.0.0.1 at 2013-07-26 10:13:51 -0400
Processing by TagsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"yofQhmgOyNHvnws/Lg+BoS4TqeTwPdyQjQbLXotnEzI=", "tag"=>{"name"=>"test", "skill"=>{"weight"=>"ee"}}, "commit"=>"Create Tag"}
Completed 500 Internal Server Error in 1ms

ActiveModel::MassAssignmentSecurity::Error (Can't mass-assign protected attributes: skill):
  app/controllers/tags_controller.rb:43:in `new'
  app/controllers/tags_controller.rb:43:in `create'

感谢任何帮助!

Answer 1

在 tag.rb 中，使 skill 属性可访问。

class Tag < ActiveRecord::Base
  has_many :skills
  attr_accessible :name, :skills_attributes, :skill
  accepts_nested_attributes_for :skills
end