Routing Error -- No route matches [POST] "/posts/new"

Question

I'm working through the rubyonrails.org 'blog tutorial', and get this error when I try to submit a 'post' : Routing Error --No route matches [POST] "/posts/new"

I copied and pasted the code from the tutorial into my code. This should return a hash with the text and title of the post, but instead I get the above error.

Here is my view:

<%= form_for :post, url: posts_path do |f| %>
  <p>
    <%= f.label :title %><br>
    <%= f.text_field :title %>
  </p>

  <p>
    <%= f.label :text %><br>
    <%= f.text_area :text %>
  </p>

  <p>
    <%= f.submit %>
  </p>
<% end %>

Here is my controller:

class PostsController < ApplicationController
    def new
    end

    def create
        render text: params[:post].inspect
    end
end

Here is my routes.rb:

Blog::Application.routes.draw do
    resources :posts
end

rake routes gives this:

    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

Here is what the rails s window generated:

Started POST "/posts/new" for 127.0.0.1 at 2013-10-05 21:17:52 -0400

ActionController::RoutingError (No route matches [POST] "/posts/new"):
  actionpack (3.2.13) lib/action_dispatch/middleware/debug_exceptions.rb:21:in `call'
  actionpack (3.2.13) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
  railties (3.2.13) lib/rails/rack/logger.rb:32:in `call_app'
  railties (3.2.13) lib/rails/rack/logger.rb:16:in `block in call'
  activesupport (3.2.13) lib/active_support/tagged_logging.rb:22:in `tagged'
  railties (3.2.13) lib/rails/rack/logger.rb:16:in `call'
  actionpack (3.2.13) lib/action_dispatch/middleware/request_id.rb:22:in `call'
  rack (1.4.5) lib/rack/methodoverride.rb:21:in `call'
  rack (1.4.5) lib/rack/runtime.rb:17:in `call'
  activesupport (3.2.13) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
  rack (1.4.5) lib/rack/lock.rb:15:in `call'
  actionpack (3.2.13) lib/action_dispatch/middleware/static.rb:63:in `call'
  railties (3.2.13) lib/rails/engine.rb:479:in `call'
  railties (3.2.13) lib/rails/application.rb:223:in `call'
  rack (1.4.5) lib/rack/content_length.rb:14:in `call'
  railties (3.2.13) lib/rails/rack/log_tailer.rb:17:in `call'
  rack (1.4.5) lib/rack/handler/webrick.rb:59:in `service'
  C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
  C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
  C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'


  Rendered C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/actionpack-3.2.13/lib/action_dispatch/middleware/templat
es/rescues/routing_error.erb within rescues/layout (1.0ms)

I've gotten this same error with other tutorials that I've tried to follow verbatum. What am I missing?

Thanks.

Solution 1

I believe your issue may be with this line:

<%= form_for :post, url: posts_path do |f| %>

Change it to:

<%= form_for @post do |f| %>

I was having the same issue. The /posts/new was loading, but when I submit the form, I got a routing error.

You should have the same form for new and edit actions, by having one separate file called _form.html.erb in /views/posts folder.

Then, in your new and edit views, you reference this form with:

<%= render "form" %>

This worked for me, after much initial confusion.

Good luck!

Solution 2

Firstly, you can just use <%= form_for @post do |f| %>.

Secondly, your controller needs to have a reference to @post. For example in new, it would be @post = Post.new.

Comments

[user2053119]

-Thanks for the suggestion, however I still get the same error. I feel like similar errors have occurred in other tutorials...can there be something wrong with how Rails is adding new routes?

[Benjamin Tan Wei Hao]

Your routes are correct. Do you have the Post class in post.rb? Have you run all the necessary migrations?

[user2053119]

-Honestly, I don't know about those. This is the beginning of the tutorial, and it hasn't covered migrations yet, and didn't mention making a Post class in post.rb. The above code is all the code the tutorial had.