问题
I have a partial solution to my previous issue which is correctly displaying the posts#index and posts#show routes, but is choking after creating a post:
ActionController::UrlGenerationError in PostsController#create
No route matches {:action=>"show", :controller=>"posts"} missing required keys: [:id, :month, :year]Extracted source (around line #32):
30 respond_to do |format|
31 if @post.save
32 format.html { redirect_to post_path, notice: 'Post was successfully created.' }
33 format.json { render :show, status: :created, location: @post }
34 else
35 format.html { render :new }
…and editing a post:
No route matches [PATCH] "/blog/example-post/blog/2015/09/example-post"
Here are all the files in question (working off the same very simple scaffolded blog):
$ 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
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 '/: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, 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
end
app/views/posts/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 %>
In summary, here's what works:
- /blog/index
- /blog/2015/09/example-post
- Creating a new post (up until the point where it's supposed to redirect to posts#show when you get the UrlGenerationError mentioned above)
- That said, the new post is added to the DB so if you go back to /index the new post will be visible
- Destroying a post
…What doesn't work:
- Editing a post (the edit page with the form will render, but after submitting your changes you'll get the aforementioned error - and the changes never make it to the DB)
- Completing the redirect after creating a new post (mentioned earlier).
- /blog/2015/index
- /blog/2015/09/index
I'm stoked that I've gotten this far - any guidance to resolving these outstanding issues would be really appreciated!
EDIT
With thanks to @brad-werth, post creation has been fixed with the following change:
posts_controller.rb
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.' }
I've also tried resolving the post edit problem in the following way:
Changed the edit route to get '/:year/:month/:id/edit', to: 'posts#edit', as: 'edit_post' and added the following override to posts_helper.rb to keep the index page from breaking:
def edit_post_path(post)
"#{post.year}/#{post.month}/#{post.slug}/edit"
end
And now the "edit" link from the index page is going to the correct URL (/blog/2015/09/example-post/edit - it used to go to /blog/example-post/edit) and successfully renders the edit page. But this results in PATCH breaking (indeed, the updates don't make it to the DB):
No route matches [PATCH] "/blog/2015/09/example-post/blog/2015/09/example-post"
I recognize that this duplication problem likely lies with this edit_post_path override, but the following attempts to force the correct PATCH route have no effect:
- Update PATCH route to
patch '/:year/:month/:id', to: 'posts#update' Name the updated PATCH route to
as: 'patch'and add PATCH path override to posts_helper:def patch_path(post) "#{post.year}/#{post.month}/#{post.slug}" endChange the override to:
def patch_path(post) "" end- Un-name & change PATCH route to
patch '', to: 'posts#update'
Looking at the posts_controller, it doesn't look like the problem is there since it's not the redirect is not the problem - and I don't see why @post.update(post_params) would be problematic:
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
So as far as I can tell the duplication in the URL is happening prior to the PATCH action, which brings us back to the EDIT flow - it must be passing the duplication to PATCH where it winds up choking. Ideas?
回答1:
Your error states:
No route matches {:action=>"show", :controller=>"posts"} missing required keys: [:id, :month, :year]
As you can see from your failing line, format.html { redirect_to post_path, notice: 'Post was successfully created.' }, you are calling post_path with no arguments.
Your route get '/:year/:month/:id', to: 'posts#show', as: 'post' expects a year, month, and id. This jives with your error message above.
To fix, simply supply the missing parameters, like so:
format.html { redirect_to post_path(@post.year, @post.month, @post), notice: 'Post was successfully created.' }
回答2:
in update and create actions change:
format.html { redirect_to post_path, notice: 'Post was successfully ...' }
with
format.html { redirect_to @post, notice: 'Post was successfully ...' }
来源：https://stackoverflow.com/questions/32644041/yyyy-mm-title-slug-url-structure-with-friendly-id-solution-chokes-on-new-and