Question

我正在以https://github.com/railscasts/154-polymorphic-association/tree/master/revised/blog-after中的ryanb描述的方式尝试评论系统。

它使用routes.rb中的Rails 3嵌套资源路由：

resources :articles do
  resource :comments
end

评论按父母类型和ID加载，如articles_controller.rb和comments_controller.rb所示：

class ArticlesController < ApplicationController
  ...
  def show
    @article = Article.find(params[:id])
    @commentable = @article
    @comments = @commentable.comments
    @comment = Comment.new
  end

class CommentsController < ApplicationController
  before_filter :load_commentable

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

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

如何在评论视图模板中添加评论编辑链接或销毁操作？

_comments.html.erb:

<% @comments.each do |comment| %>
  <div class="comment">
    <%= simple_format comment.content %>
    <%= link_to "Delete", comment, method: :delete %>
  </div>
<% end %>

Answer 1

将资源作为数组传递：

<%= link_to "Delete", [@article, @comment], method: :delete %>

Answer 2

使用jdoes建议我更多地关注数组传递并注意到routes.rb缺少资源中的s：comments。修正版：

  resources :articles do
    resources :comments do
    end
  end

现在，模板只需将链接作为数组即可完美运行。

<% @comments.each do |comment| %>
  <div class="comment">
    <%= simple_format comment.content %>
    <%= link_to "Delete", [@commentable, comment], method: :delete %>
  </div>
<% end %>

Rails 3链接到嵌套的多态资源

2 个答案: