Question

根据我earlier question解决我的original issue to implement /YYYY/MM/Slug URL structure时所获得的指导，我希望在解决我在尝试编辑帖子时收到的错误时获得一些帮助：

没有路线匹配[PATCH]＆＃34; / blog / 2015/09 / example-post / blog / 2015/09 / example-post＆＃34;

以下是所有相关文件（使用相同的非常简单的脚手架博客）：

$ rails new blog
[...]
$ cd blog
# (Add friendly_id to Gemfile & install)
$ rails generate friendly_id
$ rails generate scaffold post title content slug:string:uniq
[...]
$ rake db:migrate

的routes.rb

Rails.application.routes.draw do
  scope 'blog' do
    get     '',                       to: 'posts#index',  as: 'posts'
    post    '',                       to: 'posts#create'
    get     '/new',                   to: 'posts#new',    as: 'new_post'
    get     '/:year/:month/:id/edit', to: 'posts#edit',   as: 'edit_post'
    get     '/:year/:month/:id',      to: 'posts#show',   as: 'post'
    patch   '/:id',                   to: 'posts#update'
    put     '/:id',                   to: 'posts#update'
    delete  '/:year/:month/:id',      to: 'posts#destroy'
  end
end

post.rb

class Post < ActiveRecord::Base
  extend FriendlyId
  friendly_id :title, use: :slugged

  def year
    created_at.localtime.strftime("%Y")
  end

  def month
    created_at.localtime.strftime("%m")
  end
end

posts_controller.rb

class PostsController < ApplicationController
  before_action :set_post, only: [:show, :edit, :update, :destroy]

  def index
    @posts = Post.all
  end

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

  def new
    @post = Post.new
  end

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

  def create
    @post = Post.new(post_params)

    respond_to do |format|
      if @post.save
        format.html { redirect_to post_path(@post.year, @post.month, @post), notice: 'Post was successfully created.' }
        format.json { render :show, status: :created, location: @post }
      else
        format.html { render :new }
        format.json { render json: @post.errors, status: :unprocessable_entity }
      end
    end
  end

  def update
    respond_to do |format|
      if @post.update(post_params)
        format.html { redirect_to post_path, notice: 'Post was successfully updated.' }
        format.json { render :show, status: :ok, location: @post }
      else
        format.html { render :edit }
        format.json { render json: @post.errors, status: :unprocessable_entity }
      end
    end
  end

  def destroy
    @post.destroy
    respond_to do |format|
      format.html { redirect_to posts_url, notice: 'Post was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_post
      @post = Post.friendly.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def post_params
      params.require(:post).permit(:title, :content, :slug)
    end
  end
end

posts_helper.rb

module PostsHelper

  def post_path(post)
    "blog/#{post.year}/#{post.month}/#{post.slug}"
  end

  def edit_post_path(post)
    "#{post.year}/#{post.month}/#{post.slug}/edit"
  end

end

应用程序/视图/帖/ index.html.erb

<p id="notice"><%= notice %></p>

<h1>Listing Posts</h1>

<table>
  <thead>
    <tr>
      <th>Title</th>
      <th>Content</th>
      <th>Slug</th>
      <th colspan="3"></th>
    </tr>
  </thead>

  <tbody>
  <% @posts.each do |post| %>
    <tr>
      <td><%= post.title %></td>
      <td><%= post.content %></td>
      <td><%= post.slug %></td>
      <td><%= link_to 'Show', post_path(post) %></td>
      <td><%= link_to 'Edit', edit_post_path(post) %></td>
      <td><%= link_to 'Destroy', post, method: :delete, data: { confirm: 'Are you sure?' } %></td>
    </tr>
  <% end %>
  </tbody>
</table>

<br>

<%= link_to 'New Post', new_post_path %>

总之，这里有效：

/博客/索引
/博客/ 2015/09 /实例-交
创建新帖子
销毁帖子

......什么行不通：

编辑帖子（带有表单的编辑页面将呈现，但在提交更改后，您将收到上述错误 - 并且更改永远不会进入数据库）

我认识到这个重复问题可能在于此edit_post_path覆盖，但以下尝试强制使用正确的PATCH路由无效：

更新PATCH路由至patch '/:year/:month/:id', to: 'posts#update'
将更新后的PATCH路由命名为as: 'patch'，并将PATCH路径覆盖添加到posts_helper：
```
def patch_path(post)
  "#{post.year}/#{post.month}/#{post.slug}"
end
```
将覆盖更改为：
```
def patch_path(post)
  ""
end
```
Un-name＆amp;将PATCH路线更改为patch '', to: 'posts#update'

查看posts_controller，看起来问题并不存在，因为不是重定向不是问题 - 而且我不明白为什么会@post.update(post_params)有问题的：

  def update
    respond_to do |format|
      if @post.update(post_params)
        format.html { redirect_to @post, notice: 'Post was successfully updated.' }
        format.json { render :show, status: :ok, location: @post }
      else
        format.html { render :edit }
        format.json { render json: @post.errors, status: :unprocessable_entity }
      end
    end
  end

因此，我可以告诉URL中的重复发生在PATCH操作之前，这会将我们带回EDIT流程 - 它必须将复制传递给PATCH，它会导致阻塞。想法？提前谢谢！

修改

edit.html.erb

<h1>Editing Post</h1>

<%= render 'form' %>

<%= link_to 'Show', @post %> |
<%= link_to 'Back', posts_path %>

_form.html.erb

<%= form_for(@post) do |f| %>
  <% if @post.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@post.errors.count, "error") %> prohibited this post from being saved:</h2>

      <ul>
        <% @post.errors.full_messages.each do |message| %>
        <li><%= message %></li>
        <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <%= f.label :title %><br>
    <%= f.text_field :title %>
  </div>
  <div class="field">
    <%= f.label :content %><br>
    <%= f.text_field :content %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

Answer 1

看起来主要问题在于助手。返回的路径需要以斜杠开头：

module PostsHelper
  def post_path(post)
    "/blog/#{post.year}/#{post.month}/#{post.slug}"
  end

  def edit_post_path(post)
    "/blog/#{post.year}/#{post.month}/#{post.slug}/edit"
  end
end

如果没有开头的斜杠，浏览器会将它们视为相对路径，将它们添加到当前路径（这就是提交编辑表单时最终使用/blog/2015/09/example-post/blog/2015/09/example-post的原因）。

您还需要确保patch和put路线一致：

get     '/:year/:month/:id',      to: 'posts#show',   as: 'post'
patch   '/:year/:month/:id',      to: 'posts#update'
put     '/:year/:month/:id',      to: 'posts#update'
delete  '/:year/:month/:id',      to: 'posts#destroy'

最后，控制器需要包含PostsHelper，并将其方法用于create和update中的重定向网址：

class PostsController < ApplicationController
  include PostsHelper
...
  def create
    @post = Post.new(post_params)

    respond_to do |format|
      if @post.save
        format.html { redirect_to post_path(@post), notice: 'Post was successfully created.' }
        format.json { render :show, status: :created, location: @post }
      else
        format.html { render :new }
        format.json { render json: @post.errors, status: :unprocessable_entity }
      end
    end
  end

  def update
    respond_to do |format|
      if @post.update(post_params)
        format.html { redirect_to post_path(@post), notice: 'Post was successfully updated.' }
        format.json { render :show, status: :ok, location: @post }
      else
        format.html { render :edit }
        format.json { render json: @post.errors, status: :unprocessable_entity }
      end
    end
  end
...
end

/ YYYY / MM / Title-Slug URL结构，带有#edit上的Friendly_Id解决方案扼流圈

的routes.rb

post.rb

posts_controller.rb

posts_helper.rb

应用程序/视图/帖/ index.html.erb

1 个答案: