Rails 4 x Paperclip: "NoMethodError in Posts#create"

Question

I have a Rails app with the following models:

class User < ActiveRecord::Base
  has_many :administrations
  has_many :calendars, through: :administrations
end

class Calendar < ActiveRecord::Base
  has_many :administrations
  has_many :users, through: :administrations
  has_many: :posts
end

class Administration < ActiveRecord::Base
  belongs_to :user
  belongs_to :calendar
end

class Post < ActiveRecord::Base
  belongs_to :calendar
end

Everything used to work perfectly, until I tried to add an :image attribute to the post model with Paperclip.

Now, when I try to create a new post, I get the following error:

NoMethodError in Posts#create
undefined method `posts_path' for #<#:0x007faa87d69c08>
<%= form_for(@post) do |f| %>
  <% if @post.errors.any? %>
    
      <%= pluralize(@post.errors.count, "error") %> prohibited this post from being saved:

So, here are my files:

routes.rb:

Rails.application.routes.draw do

  devise_for :users, :path => 'account', controllers: { registrations: "registrations", confirmations: "confirmations" }

  unauthenticated :user do
    root to: 'pages#home'
  end

  authenticated :user do
    root 'calendars#index', as: :authenticated_root
  end

  resources :calendars do
    resources :posts, shallow: true do
      resources :comments, shallow: true
    end
  end

  resources :invites

  resources :administrations, only: [:destroy]

end

The _form.html.erb to create a new post:

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

      
      <% @post.errors.full_messages.each do |message| %>
        <%= message %>
      <% end %>
      
    
  <% end %>

  
    
      <%= f.label :date %>

      <%= f.date_select :date %>
    
    
      <%= f.label :time %>

      <%= f.time_select :time %>
    
    
      <%= f.label :subject %>

      <%= f.text_field :subject %>
    
    
      <%= f.label :format %>

      <%= f.text_field :format %>
    
    
      <%= f.label :copy %>

      <%= f.text_area :copy %>
    
    
      <%= f.label :image %>

      <%= f.file_field :image %>
    
  

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

The Posts#Create action from the PostsController:

def create
    @calendar = Calendar.find(params[:calendar_id])
    @post = @calendar.posts.create(post_params)

    respond_to do |format|
      if @post.save
        format.html { redirect_to calendar_path(@calendar), 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

–––––

UPDATE: as asked by @Pavan in the comments, here is the Posts#New method:

def new
  @post = Post.new
end

–––––

Also, because we create new posts from the Calendar#Show view, here is the Calendar show.html.erb:

<%= @calendar.name %> Calendar

Posts
<% if @calendar.posts.any? %>
    
  <% @calendar.posts.each do |post| %>
        
        
            
      
      
      Date
            Time
          Subject
          Format
          Copy
          Image
      Comments
        

        <%= link_to post do %><% end %>
        <%= link_to edit_post_path(post) do %><% end %>
        <%= link_to post, method: :delete, data: { confirm: 'Are you sure?' } do %><% end %>
        <%= post.date.strftime("%A, %d") %>
            <%= post.time.strftime("%I:%M %p")%>
            <%= post.subject %>
            <%= post.format %>
            <%= post.copy %>
            <%= post.image.url(:med) %>
        
          <% post.comments.each do |comment| %>
            
              <%= comment.user_first_name %>: <%= comment.body %> <%= link_to 'x', comment, method: :delete, data: { confirm: 'Are you sure?' } %>
            
          <% end %>
          
            <%= form_for([post, post.comments.build]) do |f| %>
              
                <%= f.text_area :body, :placeholder => "New comment" %><%= f.submit %>
              
            <% end %>
          
        
        
    
  <% end %>
<% else %>
This calendar does not contain any post yet: just create one with the form below.
<% end %>

Add a post to <%= @calendar.name %> Calendar:
<%= form_for([@calendar, @calendar.posts.build]), html: { multipart: true }  do |f| %>
  
    <%= f.label :date %>

    <%= f.date_select :date %>
  
  
    <%= f.label :time %>

    <%= f.time_select :time %>
  
  
    <%= f.label :subject %>

    <%= f.text_field :subject %>
  
  
    <%= f.label :format %>

    <%= f.text_field :format %>
  
  
    <%= f.label :copy %>

    <%= f.text_area :copy %>
  
  
    <%= f.label :image %>

    <%= f.file_field :image %>
  
  
    <%= f.submit %>
  
<% end %>


<%= link_to 'Edit', edit_calendar_path %> |
<%= link_to 'Back', calendars_path %>

Here is the migration I used to add the attachment to the Post model:

class AddPaperclipToPost < ActiveRecord::Migration
  def change
    remove_column :posts, :media
    add_attachment :posts, :image
  end
end

I did that because I used to have a :media attribute on my Post model, but wanted to replace it with an :image attribute and use this :image attribute to allow users to upload files to posts.

Here is the Post model:

class Post < ActiveRecord::Base

  belongs_to :calendar

  has_attached_file :image, styles: { small: "64x64", med: "100x100", large: "200x200" }
  validates_attachment :image, :content_type => { :content_type => "image/jpg" },
                                :size => { :in => 0..2000.kilobytes }
end

And, last but not least, here are my server logs:

Started POST "/calendars/3/posts" for ::1 at 2015-09-21 16:46:29 -0700
Processing by PostsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"8TUY8AhkQmnDbYo6dmIEdEWpo7bXl0gBEzlxKIyuxivxAofK/cWcxzMN2E646q/SpkLkQFdq1pcaXebw3VvrWQ==", "post"=>{"date(1i)"=>"2015", "date(2i)"=>"9", "date(3i)"=>"21", "time(1i)"=>"2015", "time(2i)"=>"9", "time(3i)"=>"21", "time(4i)"=>"23", "time(5i)"=>"32", "subject"=>"Another image test", "format"=>"Image", "copy"=>"This is a second image test to see if Paperclip works.", "image"=>#, @original_filename="Capture d’écran 2015-09-21 à 08.55.58.png", @content_type="image/png", @headers="Content-Disposition: form-data; name="post[image]"; filename="Capture d\xE2\x80\x99\xC3\xA9cran 2015-09-21 \xC3\xA0 08.55.58.png"
Content-Type: image/png
">}, "commit"=>"Create Post", "calendar_id"=>"3"}
  Calendar Load (0.1ms)  SELECT  "calendars".* FROM "calendars" WHERE "calendars"."id" = ? LIMIT 1  [["id", 3]]
   (0.1ms)  begin transaction
Command :: file -b --mime '/var/folders/8x/t_8ws7y91k34_qzf2ttl0hnw0000gq/T/b27b4279f10a51498de05fe8699e95ec20150921-24195-16bb55q.png'
Command :: file -b --mime '/var/folders/8x/t_8ws7y91k34_qzf2ttl0hnw0000gq/T/b27b4279f10a51498de05fe8699e95ec20150921-24195-brivpw.png'
   (0.1ms)  commit transaction
   (0.0ms)  begin transaction
Command :: file -b --mime '/var/folders/8x/t_8ws7y91k34_qzf2ttl0hnw0000gq/T/b27b4279f10a51498de05fe8699e95ec20150921-24195-8rl6x7.png'
   (0.1ms)  rollback transaction
  Rendered posts/_form.html.erb (16.9ms)
  Rendered posts/new.html.erb within layouts/application (17.9ms)
Completed 500 Internal Server Error in 74ms (ActiveRecord: 1.2ms)

ActionView::Template::Error (undefined method `posts_path' for #<#:0x007faa87d69c08>):
    1: <%= form_for(@post) do |f| %>
    2:   <% if @post.errors.any? %>
    3:     
    4:       <%= pluralize(@post.errors.count, "error") %> prohibited this post from being saved:
  app/views/posts/_form.html.erb:1:in `_app_views_posts__form_html_erb___617022956579766846_70185160605820'
  app/views/posts/new.html.erb:3:in `_app_views_posts_new_html_erb__3720911906763373835_70185160686220'
  app/controllers/posts_controller.rb:35:in `block (2 levels) in create'
  app/controllers/posts_controller.rb:30:in `create'


  Rendered /Users/TXC/.rvm/gems/ruby-2.2.1@global/gems/actionpack-4.2.2/lib/action_dispatch/middleware/templates/rescues/_source.erb (10.7ms)
  Rendered /Users/TXC/.rvm/gems/ruby-2.2.1@global/gems/actionpack-4.2.2/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (4.6ms)
  Rendered /Users/TXC/.rvm/gems/ruby-2.2.1@global/gems/actionpack-4.2.2/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (1.5ms)
  Rendered /Users/TXC/.rvm/gems/ruby-2.2.1@global/gems/actionpack-4.2.2/lib/action_dispatch/middleware/templates/rescues/template_error.html.erb within rescues/layout (72.9ms)
Cannot render console with content type multipart/form-dataAllowed content types: [#, #, #]

—————

UPDATE 2: I updated the Posts#Create action as recommended by @Pavan:

def new
  @calendar = Calendar.find(params[:calendar_id])
  @post = @calendar.posts.build
end

Now, when I try to visit any calendar show view, I get the following error:

SyntaxError in CalendarsController#show
/Users/TXC/code/rails/calendy/app/views/calendars/show.html.erb:51: syntax error, unexpected tLABEL ... @calendar.posts.build]), html: { multipart: true } do |f| ... ... ^ /Users/TXC/code/rails/calendy/app/views/calendars/show.html.erb:51: syntax error, unexpected keyword_do_block, expecting keyword_end ..., html: { multipart: true } do |f| @output_buffer.safe_appe... ... ^ /Users/TXC/code/rails/calendy/app/views/calendars/show.html.erb:85: syntax error, unexpected keyword_ensure, expecting end-of-input
Add a post to <%= @calendar.name %> Calendar:
<%= form_for([@calendar, @calendar.posts.build]), html: { multipart: true }  do |f| %>
  
    <%= f.label :date %>

    <%= f.date_select :date %>

—————

UPDATE 3: to fix the above problem (from UPDATE 2), I replaced <%= form_for([@calendar, @calendar.posts.build]), html: { multipart: true } do |f| %> with <%= form_for[@calendar, @calendar.posts.build], html: { multipart: true } do |f| %>.

This made the calendar show views to work again.

However, when I try to add a new post from the calendar index view, I still get the same error as mentioned originally in this question:

NoMethodError in Posts#create
undefined method `posts_path' for #<#:0x007f86f752ebf0>
<%= form_for(@post) do |f| %>
  <% if @post.errors.any? %>
    
      <%= pluralize(@post.errors.count, "error") %> prohibited this post from being saved:

I am happy to share any necessary additional code to help.

—————

Again, everything was working before I tried to implement Paperclip.

Any idea of what is going wrong?

Pavan · Accepted Answer

Try changing your new method like below

def new
  @calendar = Calendar.find(params[:calendar_id])
  @post = @calendar.posts.build
end

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