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ruby-on-rails - 删除帖子的评论会删除整个帖子

问题描述

当我尝试删除对帖子的评论时，我最终会删除整个帖子。

评论控制器

class CommentsController < ApplicationController

  def create
    @micropost = Micropost.find_by(id: params[:micropost_id])
    @comment = 
   @micropost.comments.create(params[:comment].permit(:name,:body))
    if @comment.save
      flash[:success] = "Comment Posted"
  end
    redirect_to request.referrer
  end

  def destroy
    @comment = Comment.find(params[:id])
    @comment.destroy

   redirect_to request.referrer
  end
end

评论视图

<li>
  <ol class="microposts">
    <% @post.comments.each do |comments| %>
      <li>
        <article class="article-container-full">
          <%=  comments.name%>
          <hr>
         <%= comments.body %>
          <hr>
          <p class="posted-time"> Posted <%= 
           time_ago_in_words(comments.created_at) %> ago</p>
          <p>
          <%= link_to 'Delete', @comment, :method => :delete, data: 
            {confirm: 'Are you sure?'}%>
         </p>
       </article>
       <br>
      </li>
    </ol>
  <% end %>
</li>

评论路线

 micropost_comments GET    
 /microposts/:micropost_id/comments(.:format)          
 comments#index
                    POST   
 /microposts/:micropost_id/comments(.:format)          
 comments#create
 new_micropost_comment GET    
 /microposts/:micropost_id/comments/new(.:format)      comments#new
 edit_micropost_comment GET    
 /microposts/:micropost_id/comments/:id/edit(.:format) 
  comments#edit
  micropost_comment GET    
  /microposts/:micropost_id/comments/:id(.:format)      
  comments#show
                    PATCH  
  /microposts/:micropost_id/comments/:id(.:format)      
  comments#update
                    PUT    
  /microposts/:micropost_id/comments/:id(.:format)      
  comments#update
                    DELETE 
  /microposts/:micropost_id/comments/:id(.:format)      
  comments#destroy

微贴模型：

class Micropost < ApplicationRecord

  has_many :comments, dependent: :destroy
  belongs_to :user
  validates :user_id, presence: true
  validates :headline, presence: true, length: { maximum: 200 }
  validates :content, presence: true, length: { maximum: 10000 }

end

评论型号：

class Comment < ApplicationRecord
  belongs_to :micropost
end

Microposts Controller 中的销毁方法只是以防万一：

  def destroy
    @micropost.destroy
    flash[:success] = "Post deleted"
    redirect_to request.referrer || current_user
  end

我有一种感觉，我错过了一些非常小的东西，但我只能看到它。它不仅删除了评论，还删除了整个帖子以及与之相关的所有其他内容。

标签： ruby-on-rails

解决方案

首先，你还没有@comment在任何地方初始化。这就是您收到此错误的原因。

另一件事是您不应该comments在 do..end 循环中使用该变量。因为它，对评论的迭代使它变得单一。

尝试跟随，

<li>
  <ol class="microposts">
    <% @post.comments.each do |comment| %>
      <li>
        <article class="article-container-full">
          <%=  comment.name%>
          <hr>
         <%= comment.body %>
          <hr>
          <p class="posted-time"> Posted <%= 
           time_ago_in_words(comment.created_at) %> ago</p>
          <p>
          <%= link_to "Delete Comment", [@post ,comment], :confirm => "Are you sure?", :method => :delete%>
         </p>
       </article>
       <br>
      </li>
    </ol>
  <% end %>
</li>

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