Question

class Question < ActiveRecord::Base
 belongs_to :category
end

class Category < ActiveRecord::Base
  has_many :questions
  accepts_nested_attributes_for :questions, allow_destroy: true
end

CategoriesController：

private  
  def category_params
    params.require(:category).permit(:title, questions_attributes: [:id, :category_id, :title, :_destroy])
  end

在视图中，我有一个显示其所有帖子的类别（CategoriesController#show）。

每个帖子都是可删除的。

如何通过更新类别构建删除帖子的link_to帮助器？

Answer 1

link_to "Remove question", category_path(category, question_attributes(id: question.id, _destroy: true)), method: :put

Answer 2

= link_to 'Delete question', question, method: :delete, data: {confirm: 'Are you sure?'}

和routes.rb

resources :questions

并在您的控制器中执行必要的操作

class QuestionController < ApplicationController
   def delete
      question = Question.find(params[:id])
      question.category = nil #or whatever you need to do
      question.save
   end
end

Answer 3

link_to "Remove question", category_path(category: { questions_attributes: {id: question.id, _destroy: true}}), method: :put

Answer 4

最好使用控制器中的.delete collection method完成此操作：

#app/controllers/categories_controller.rb
def delete_question
   @category = Category.find params[:category_id]
   question = category.questions.find params[:id]

   @category.questions.delete question
end

要实现这一点，您需要使用routes和link_to这样的帮助：

#config/routes.rb
resources :categories do
   patch "question/:id", to: "categories#delete_question" #-> domain.com/categories/15/question/1
end

#app/views/categories/show.html.erb
<% @category.questions.each do |question| %>
    <%= link_to "Remove Question", category_question_removal_path(category, question) method: :patch %>
<% end %>

使用link_to删除关联对象以更新操作

4 个答案: