Question

我使用带注释的多态关联。当我尝试添加＆＃39;编辑＆＃39;并且还“摧毁”＃39;在show template中，我在标题中得到错误（现在只编辑）。如何将两个链接添加到show？

comments_controller.rb

class CommentsController < ApplicationController
  ....
  before_action :signed_in_user, only: [:new, :edit]
  before_filter :load_commentable

def index
  @commentable = load_commentable
  @comments = @commentable.comments
end

def show
end

def edit
  @commentable = load_commentable
end

def new
 @commentable = load_commentable
 @comment = @commentable.comments.new
end

def create
 @comment = @commentable.comments.new(comment_params)
 @comment.user = current_user

if @comment.save
  redirect_to @comment, notice: "Created."
 else
  render :new
 end
end

def update
  @comment = @commentable.comments.build(comment_params)
  @comment.user = current_user

respond_to do |format|
  if @comment.update(comment_params)
    format.html { redirect_to @comment, notice: 'It was successfully updated.' }
    format.json { head :no_content }
  else
    format.html { render action: 'edit' }
    format.json { render json: @comment.errors, status: :unprocessable_entity }
  end
 end
end



private

def load_commentable
  resource, id = request.path.split('/')[1, 2]
  @commentable = resource.singularize.classify.constantize.find(id)
end

....

end

show.html.erb模板

<%= link_to "Edit", [:edit, @commentable, :comment] %>

形式

<%= form_for [@commentable, @comment] do |f| %>
....

full trace

日志

由CommentsController处理＃显示为HTML
  参数：{＆＃34; post_id＆＃34; =＆gt;＆＃34; 1＆＃34;，＆＃34; id＆＃34; =＆gt;＆＃34; 2＆＃34;}
  注释加载（0.3ms）SELECT＆＃34;注释＆＃34;。* FROM＆＃34;注释＆＃34;哪里   ＃＆34;注释＆＃34;＆＃34; ID＆＃34; =？限制1 [[＆＃34; id＆＃34;，＆＃34; 2＆＃34;]]
  后载（0.2ms）SELECT＆＃34;帖子＆＃34;。* FROM＆＃34;帖子＆＃34;在哪里＆＃34;帖子＆＃34;。＆＃34; id＆＃34; =   ？限制1 [[＆＃34; id＆＃34;，＆＃34; 1＆＃34;]]
  用户负载（0.2ms）SELECT＆＃34;用户＆＃34;。* FROM＆＃34;用户＆＃34;用户＆＃34;。＆＃34; id＆＃34; =   ？ ORDER BY＆＃34;用户＆＃34;。＆＃34; id＆＃34; ASC LIMIT 1 [[＆＃34; id＆＃34;，2]]
  （0.2ms）SELECT COUNT（*）FROM＆＃34; comments＆＃34;在哪里＆＃34;评论＆＃34;。＆＃34; user_id＆＃34; =   ？ [[＆＃34; user_id＆＃34;，2]] CACHE（0.0ms）SELECT COUNT（*）FROM＆＃34; comments＆＃34;   在哪里＆＃34;评论＆＃34;。＆＃34; user_id＆＃34; =？ [[＆＃34; user_id＆＃34;，2]]
  在布局/应用程序（10.7ms）内呈现注释/ show.html.erb
  在19毫秒内完成500内部服务器错误

ActionView :: Template ::错误（没有路线匹配{：action =＆gt;＆＃34;编辑＆＃34;，   ：controller =＆gt;＆＃34;评论＆＃34;，：post_id =＆gt;＃，：id =＆gt; nil，   ：format =＆gt; nil}缺少必需的键：[：id]）：
25:           <div class="thumbsdown"><%= link_to image_tag('othericons/thumbiconDown.PNG', height: '20', width: '20'),
＆＃34;＃＆＃34; ％GT;
      26：＆lt;％= link_to image_tag（＆＃39; othericons / flagicon.PNG＆＃39;，身高：＆＃39; 20＆＃39;，宽度：＆＃39; 18＆＃39;），＆＃34;＃＆＃34;   ％GT;
      27：
      28：＆lt;％= link_to＆＃34;编辑＆＃34;，[：编辑，@注释，：评论]％＆gt; 29：
      30：

      31：app / views / comments / show.html.erb:28:in   `_app_views_comments_show_html_erb ___ 2937579164590753686_69833853514120＆＃39;
Rendered /home/action/.rvm/gems/ruby-2.0.0-p247/gems/actionpack-4.0.0/lib/action_dispatch/middleware/templates/rescues/_trace.erb
（1.6ms）呈现 /home/action/.rvm/gems/ruby-2.0.0-p247/gems/actionpack-4.0.0/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb （1.2ms）呈现 /home/action/.rvm/gems/ruby-2.0.0-p247/gems/actionpack-4.0.0/lib/action_dispatch/middleware/templates/rescues/template_error.erb 在救援/布局（19.1ms）内

路线：

resources :posts do
  resources :comments
end

Answer 1

更改Edit链接，如下所示：

<%= link_to "Edit", edit_post_comment_path(@commentable, @comment) %>

您已将Post和Comment设置为嵌套路线，因此您需要将Post的对象以及Comment传递给编辑路径。

修改

对于多态关联，您可以按如下方式使用它：

<%= link_to "Edit", [:edit, @commentable, @comment] %>

注释#show中的ActionController :: UrlGenerationError

1 个答案: