提交中的NoMethodError＃show

Question

我收到以下错误：

Submissions＃show中的NoMethodError显示未定义的方法`comment_path'

我可以登录，输入标题和URL，然后发表评论。 当我点击“创建评论”按钮时

这是错误的地方：

<%= link_to 'delete', comment, method: :delete, data: { confirm: 'are you sure?'} %>

除了错误之外，我还想添加一条注释，而不是删除一条？

_comment.html.erb

 <%= div_for(comment) do %>
     <div class="comments-wrapper clearfix">
       <div class="null-left">
          <p><small> <%= comment.user.email %> <strong><%= 
          time_ago_in_words(comment.created_at) %></strong> ago </small></p>
          <p class="lead"><%= comment.body %></p>
       </div> 
     </div> 
    <% if comment.user == current_user %> 
        <%= link_to 'delete', comment, method: :delete, data: { confirm: 
            'are you sure?'} %> 
        <% end %>
    <% end %>

comments_controller.rb

class CommentsController < ApplicationController
before_action :set_comment, only: [:show, :edit, :update, :destroy]

   def create
    @submission = Submission.find(params[:submission_id])
    @comment = @submission.comments.new(comment_params)
    @comment.user = current_user

respond_to do |format|
  if @comment.save
    format.html { redirect_to @submission, notice: 'Comment was successfully created.' }
  else
    format.html { render :new }
  end
end
  end
      def destroy
        @comment.destroy
    respond_to do |format|
      format.html { redirect_to comments_url, notice: 'Comment was 
        successfully destroyed.' }
    format.json { head :no_content }
    end
  end

  private

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


def comment_params
  params.require(:comment).permit(:submission_id, :body, :user_id)
end
end

submit_controller.rb

    class SubmissionsController < ApplicationController
      before_action :set_submission, only: [:show, :edit, :update, :destroy]
      before_action :authenticate_user!, except: [:index, :show]

      def index
    @submissions = Submission.all
  end

  def show
  end

  def new
    @submission = current_user.submissions.build
  end

  def edit
  end

 def create
    @submission = current_user.submissions.build(submission_params)

    respond_to do |format|
      if @submission.save
        format.html { redirect_to @submission, notice: 'Submission was 
          successfully created.' }
        format.json { render :show, status: :created, location: @submission 
          }
      else
        format.html { render :new }
        format.json { render json: @submission.errors, status: 
           :unprocessable_entity }
      end
    end
  end

 def update
    respond_to do |format|
      if @submission.update(submission_params)
        format.html { redirect_to @submission, notice: 'Submission was 
   successfully updated.' }
        format.json { render :show, status: :ok, location: @submission }
      else
        format.html { render :edit }
        format.json { render json: @submission.errors, status: 
        :unprocessable_entity }
      end
    end
  end

def destroy
@submission.destroy
respond_to do |format|
  format.html { redirect_to submissions_url, notice: 'Submission was 
  successfully destroyed.' }
  format.json { head :no_content }
   end
  end

def upvote
    @submission = Submisson.find{params[:id]}

    @submission.upvote_by current_user
    redirect_to :back
  end

  def downvote
    @submission = Submisson.find{params[:id]}

    @submission.downvote_by current_user
    redirect_to :back
  end

  private

def set_submission
  @submission = Submission.find(params[:id])
end


def submission_params
  params.require(:submission).permit(:title, :url)
end
end

routes.rb

Rails.application.routes.draw do

  devise_for :users
    resources :submissions do
      member do
        put "Like", to: "submission#upvote"
        put "Dislike", to: "submission#downvote"
    end
    resources :comments 
  end
  root to: "submissions#index"


end

Answer 1

要删除，您需要传递提交ID，例如

您的密码

<%= link_to 'delete', comment, method: :delete, data: { confirm: 'are you sure?'} %>

修改后

<%= link_to 'Delete', [comment.submission, comment], method: :delete, data: { confirm: 'Are you sure?' } %>

在评论表上

<%= f.hidden_field :user_id, value: current_user.id %>

在评论控制器上创建操作，删除这两行

@comment = @submission.comments.new(comment_params)
@comment.user = current_user

更新后删除链接，然后测试是否创建注释，如果仍然没有创建注释，请遵循以下代码。

现在，您的评论创建操作如下所示

def create
    @submission = Submission.find(params[:submission_id])
    respond_to do |format|
      if @submission.comments.create(comment_params)
        format.html { redirect_to @submission, notice: 'Comment was successfully created.' }
      else
        format.html { render :new }
      end
    end
end

我的项目中的该代码已经正常运行，如果在您这边不起作用，那么如果您有公共存储库，则发布URL或发布完整的错误跟踪。

基于GitHub链接更新

如果您运行rake routes那么您将看到注释删除路径格式，例如

DELETE /submissions/:submission_id/comments/:id(.:format)      comments#destroy

您需要传递submission_id和id才能删除评论

更新link_to删除看起来像这样

<%= link_to 'Delete', [comment.submission, comment], method: :delete, data: { confirm: 'Are you sure?' } %>

和你的destroy动作看起来像这样的comments_controller

def destroy
    @submission = Submission.find(params[:submission_id])
    @comment = @submission.comments.find(params[:id])
    @comment.destroy
    redirect_to submission_path(@submission)
end

希望能帮助到你