Question

我正在按照rails 3指南学习rails。

博客应用程序现已运行，但是我想让评论可编辑，并在帖子显示页面中进行更新，创建表单。所以我做了以下修改：

post.show.htm.erb：

<h2>Comments</h2>
<% @post.comments.each do |comment| %>
  <tr>
    <td><%= comment.commenter %></td>
    <td><%= comment.body %></td>
    <td><%= link_to 'Edit', edit_post_comment_path(@post,comment) %></td>
    <td><%= link_to 'Destroy', post_comment_path(@post,comment), confirm: 'Are you sure?', method: :delete %></td>
  </tr>
<% end %>
</table>

<h2>Add a comment:</h2>

#here,I can not set the form_for property.
<%= form_for([@post,@comment],:url=>post_comment_path) do |f| %>
  <div class="field">
    <%= f.label :commenter %><br />
    <%= f.text_field :commenter %>
  </div>
  <div class="field">
    <%= f.label :body %><br />
    <%= f.text_area :body %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

控制器控制器：

class CommentsController < ApplicationController
  # GET /posts/1/comments/1/edit
  def edit
    #render json: params
    @post=Post.find(params[:post_id])
    @comments=Comment.all
    @comment = Comment.find(params[:id])
    render "/posts/show"
  end

  #other action omitted

  def show
    # I donot know what to do here
  end
end

但是我无法访问该链接：

http://localhost:3000/posts/1

我收到错误：

No route matches {:action=>"show", :controller=>"comments"}

事实上，你可以看到我在CommentController中有show动作。

并且，我想知道它为什么会访问评论#show action？

这是我的路线：

    post_comments GET    /posts/:post_id/comments(.:format)          comments#index
                  POST   /posts/:post_id/comments(.:format)          comments#create
 new_post_comment GET    /posts/:post_id/comments/new(.:format)      comments#new
edit_post_comment GET    /posts/:post_id/comments/:id/edit(.:format) comments#edit
     post_comment GET    /posts/:post_id/comments/:id(.:format)      comments#show
                  PUT    /posts/:post_id/comments/:id(.:format)      comments#update
                  DELETE /posts/:post_id/comments/:id(.:format)      comments#destroy
            posts GET    /posts(.:format)                            posts#index
                  POST   /posts(.:format)                            posts#create
         new_post GET    /posts/new(.:format)                        posts#new
        edit_post GET    /posts/:id/edit(.:format)                   posts#edit
             post GET    /posts/:id(.:format)                        posts#show
                  PUT    /posts/:id(.:format)                        posts#update
                  DELETE /posts/:id(.:format)                        posts#destroy
       home_index GET    /home/index(.:format)                       home#index
             root        /                                           home#index

/posts/:id会触发posts#show。为什么comments#show？

Answer 1

如果您需要编辑帖子，请添加

def edit
  @post = Post.find(params[:id])
end

def update
  @post = Post.find(params[:id])
  if @post.update_attributes(params[:post])
    redirect_to some_path and return
  end
  render 'edit' #error
end

编辑表单应向服务器发送PUT请求。 rails使用routes文件将url和请求（如GET / POST / PUT / DELETE）映射到控制器操作。

这里

PUT    /posts/:id(.:format)                        posts#update

请求是PUT，控制器是PostsController，操作是更新。

也

post GET    /posts/:id(.:format)                        posts#show

如果POST / PUT / DELETE，则需要从表单传递http请求。你可以为'编辑'

这样做

<%= form_for([@post,@comment],:url=>post_comment_path, :method => :put) do |f| %>

映射到PostsController的show请求。格式是html bydefault。有关详细信息，请详细查看服务器日志。

使评论（在rails guide exmple中）可编辑

1 个答案: