刪除嵌套屬性時，未經允許的屬性_destroy

Question

以下railscasts＃196但使用Rails 4 - 試圖從問題父模型中刪除答案時遇到問題。

未經許可的參數：_destroy

_answer_fields.html.erb

<fieldset>                                                 
    <%= f.text_field :response %>                                          
    <%= f.hidden_field :_destroy %>                                                                                             
    <%= link_to "remove" , "#", class: "remove_fields" %>                                    
</fieldset>  

question.rb

accepts_nested_attributes_for :questions, :allow_destroy => true 

surveys_controller.rb

def survey_params                                              
    params.require(:survey).permit(:name, :questions_attributes => [:id, :content, :answers_attributes => [:id, :response]])                    
end 

我從表單上刪除字段的罰款，但記錄並沒有被刪除。

感謝

編輯： JS設置隱藏變量

jQuery ->                                                 
     $(document).on 'click' , ".remove_fields" , (event) ->                                    
       $(this).prev('input[type=hidden]').val('1')                                     
       $(this).closest('fieldset').hide()                                       
       event.preventDefault() 

Answer 1

@Hitham S. AlQadheeb可能是正確的 - 檢查你的模型是正確的......

survey.rb

class Survey < ActiveRecord::Base 
    has_many :questions, :dependent => :destroy 
    accepts_nested_attributes_for :questions 
end 

和question.rb

class Question < ActiveRecord::Base 
    belongs_to :survey 
    has_many :answers, :dependent => :destroy 
    accepts_nested_attributes_for :answers, :reject_if => lambda { |a| a[:content].blank? }, :allow_destroy => true 
end 

但是Unpermitted parameters: _destroy錯誤實際上應該指的是您的控制器的Strong Params實現：survey_params。您需要告訴欄杆您的表格將通過:_destroy字段。試試這個：

def survey_params                                              
    params.require(:survey).permit(:name, :questions_attributes => [:id, :content, :_destroy, :answers_attributes => [:id, :response, :_destroy]])                    
end 
---------------------------------------------------------------------------------^ 
-------------------------------------------------------------------------------------------------------------------------------------^ 

Answer 2

應該

question.rb

belongs_to :survey 
has_many :answers, : dependent => :destroy 
accepts_nested_attributes_for :answers, :allow_destroy => true 

看它再次http://railscasts.com/episodes/196-nested-model-form-part-1