在哪里在Rails中对模型验证失败的控制器进行渲染？

问题描述：

我在我的rails应用程序中有一个简单的视频模型， has_many 注释。我在视频的展示页上显示这些评论。当我提交表单一切正常;然而，如果在评论模型上有验证错误，那么我的系统爆炸。如果在注释模型上有验证错误，我只想再次呈现视频的显示页面，验证错误样式显示。我如何在我的创建动作内这样做？非常感谢！

I have a simple Video model in my rails app that has_many comments. I am displaying these comments on the video's show page. When I submit the form everything works fine; however, if there are validation errors on the Comment model, then my system blows up. If there are validation errors on the Comment model, I would simply like to render the video's show page again, with the validation error styling showing. How do I do this inside of my create action? Thanks a lot!

class CommentsController < ApplicationController
  def create
    @video = Video.find(params[:video_id])
    @comment = @video.comments.build(params[:comment])
    if @comment.save
      redirect_to @video, :notice => 'Thanks for posting your comments.'
    else
      render # what? What do I render in order to show the video page's show action with the validation error styling showing? Please help!
    end
  end
end

答

为此，你必须渲染一个模板：

To do this you'll have to render a template:

class CommentsController < ApplicationController
  def create
    @video = Video.find(params[:video_id])
    @comment = @video.comments.build(params[:comment])
    if @comment.save
      redirect_to @video, :notice => 'Thanks for posting your comments.'
    else
      render :template => 'videos/show'
    end
  end
end

Keep记住，你必须在CommentsController＃create操作中声明任何实例变量（如@video），因为VideosController＃show操作不会运行，模板将被简单地渲染。例如，如果您在VideosController＃show操作中有一个@video_name变量，则必须向CommentsController＃create操作添加相同的@video_name实例变量。

Keep in mind that you'll have to declare any instance variables (like @video) inside of the CommentsController#create action as well though, because the VideosController#show action will not be run, the template will simply be rendered. For instance, if you have an @video_name variable in your VideosController#show action, you'll have to add the same @video_name instance variable to the CommentsController#create action.

在哪里在Rails中对模型验证失败的控制器进行渲染？

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