ruby-on-rails - 参数[:id] returning nil for custom action

Question

我正在尝试实现评论回复。在此过程中，我必须在 comments_controller 中创建一个新操作，以便使用 AJAX 让回复表单在不刷新页面的情况下显示。问题是当我执行代码时

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

Params[:id] 给出 nil。

我的一些文件

#routes.rb
resources :comments, :only => [:create, :destroy] do
    get :reply
end

然后

#_comment.haml
%div.comment{ :id => "comment-#{comment.id}" }
    %hr
    = link_to "×", comment_path(comment), :method => :delete, :remote => true, :confirm => "Are you sure you want to remove this comment?", :disable_with => "×", :class => 'close'
    %h4
        = comment.user.first_name
        %small= comment.updated_at
    %p= comment.body
    %p= link_to "Reply", comment_reply_path(comment), :method => :get, :remote => true

和

#comments_controller.rb
def reply
    @comment = Comment.find(params[:id])
    respond_to do |format|
      format.js
    end
end

当我这样做时，同一行 Comment.find(params[:id]) 有效

= link_to "×", comment_path(comment), :method => :delete, :remote => true, :confirm => "Are you sure you want to remove this comment?", :disable_with => "×", :class => 'close'

但不适合

%p= link_to "Reply", comment_reply_path(comment), :method => :get, :remote => true

我猜这与我的路线有关？另外，作为一个可能相关的附带问题，当我为自定义操作制定路线时，何时使用 get、post、delete、patch 等。

Answer 1

请尝试在您的 route 添加成员

#routes.rb
resources :comments, :only => [:create, :destroy] do
  get :reply, on: :member
end

当你不添加on: :member时，生成的路由将为/comments/:comment_id/reply，当你添加时，生成的路由将为/comments/:id/reply.