Rails 5 - 实现可重用的评论模型 - 视图? [英] Rails 5 - implement reusable comment model - views?

问题描述

在我为学习 RoR 而构建的应用程序中，我遇到了类似的情况 问题.现在我的问题是如何改变我对此的看法?

In my app that I am building to learn RoR, I have a similar situation like this question. Now my question is how to change my views for this?

我有一个 Annotation 模型、一个 Document 模型和一个 Comment 模型.如果我切换到多态关联，以便我的 Annotations 和我的 Documents 可以有 Comments，如何进行视图(在部分中)?

I have an Annotation model, a Document model and a Comment model. If I switch to a polymorphic association such that my Annotations and my Documents can have Comments, how to do the view (in the partial)?

这是当前的部分:

<%= simple_form_for([@annotation, @annotation.comments.build], html: { class: 'form-vertical', multipart: true }) do |f| %>

   <%= f.error_notification %>

   <%= f.input :commenter, :as => :hidden, :input_html => { :value => current_user.username }, label: false %>

   <%= f.input :body, placeholder: 'comment', focus: true, label: false %>

   <%= f.button :submit, 'Save' %>

<% end -%>

更新

进一步研究并在我的注释视图中进行了如下更改:<%= render 'comments/form', :object =>@annotation%>

并在我的文档视图中如下: <%= render 'comments/form, :object =>@document %>

and as follows in my documents view: <%= render 'comments/form, :object => @document %>

并在我的部分进行了调整:

And adjusted this in my partial:

<%= simple_form_for([object, object.comments.build], html: { class: 'form-vertical', multipart: true }) do |f| %>

现在，当向文档添加评论时，我的 CommentsController 中出现错误 - 逻辑上是 :-) .

Now, when adding a comment to a document, I get an error in my CommentsController - logical that is :-) .

ActiveRecord::RecordNotFound in CommentsController#create

ActiveRecord::RecordNotFound in CommentsController#create

这是我当前的 CommentsController:

This is my current CommentsController:

class CommentsController < ApplicationController

  def create
    @annotation = Annotation.find(params[:annotation_id])
    @comment = @annotation.comments.create(comment_params)
    redirect_to annotation_path(@annotation)
  end

  def destroy
    @annotation = Annotation.find(params[:annotation_id])
    @comment = @annotation.comments.find(params[:id])
    @comment.destroy
    redirect_to annotation_path(@annotation)
  end

  private
    def comment_params
    params.require(:comment).permit(:commenter, :body)
  end
end

如何(最好)改变这一点?

How (best) to change this ?

我现在已经使用 :as => 为另一个名为tag"的对象/模型/类实现了相同的功能.:tagable 并且我可以为注释创建、列出等，但我无法删除.

I now have implemented the same for another object/model/class called "tag" using :as => :tagable and I can create, list, etc for the Annotation, yet I cannot delete.

列表(作为部分)被调用:

The listing (as a partial) is called with:

<%= render 'tags/tag_list', :object => @annotation %>

或:

<%= render 'tags/tag_list', :object => @document %>

打开注释/文档记录时，抛出错误:

When opening the Annotation / Document record, it throws the error:

未定义的方法`object' #你的意思?object_id

undefined method `object' for # Did you mean? object_id

...在这一行:

<td><%= link_to '', [tag.object, tag], method: :delete, data: { confirm: 'Please confirm deletion!' }, :class => "glyphicon glyphicon-remove" %></td>

我应该改变什么??

换行

<td><%= link_to '', [object, tag], method: :delete, data: { confirm: 'Please confirm deletion!' }, :class => "glyphicon glyphicon-remove" %></td>

推荐答案

你必须以某种方式获取正确的可评论.最简单的解决方案是这样的:

You have to fetch correct commentable somehow. The simplest solution would be like this:

def create
  commentable = detect_commentable
  commentable.comments.create(comment_params)
  redirect_to commentable_path(commentable)
end

private

def commentable_path(commentable)
  case commentable
  when Document
    document_path(commentable)
  when Annotation
    annotation_path(commentable)
  else
    fail 'unknown commentable'
  end
end

def detect_commentable
  if params[:annotation_id]
    Annotation.find(params[:annotation_id])
  elsif params[:document_id]
    Document.find(params[:document_id])
  else
    fail 'Commentable not found'
  end
end

这显然不是最好的代码(一方面是因为维护需求).但这应该会让你开始.

It is not the best code, obviously (because of maintenance requirements, for one thing). But this should get you started.

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