Question

I have a problem with my avatar upload. It worked once for me but I must be blind this time.
I am using paperclip and aws-sdk gem and set up everything as described here.

I have tested it with 2 buckets. One with the standard us-location and one with the eu-west-1 location. Neither is working.

Here is all my related code:

config/s3.yml

development:
  bucket: ***
  access_key_id: ***  
  secret_access_key: ***
test:
  bucket: ***
  access_key_id: ***  
  secret_access_key: ***
production:
  bucket: ***
  access_key_id: ***  
  secret_access_key: ***

app/model/art.rb

class Art < ActiveRecord::Base
  attr_accessible :created_at, :description, :name, :avatar
  has_attached_file :avatar,
      :storage => :s3,
      :s3_credentials => "#{Rails.root}/config/s3.yml",
      :url => ':set_alias_url',
      :path => "/:style/:id/:filename.:extension",
          :bucket => '***'

end

app/controller/arts_controller.rb

class ArtsController < ApplicationController 
...
def create
      @art = Art.new(params[:art])
      if @art.save
          flash[:notice] = "sucessfully saved upload" 
          redirect_to arts_path
      else 
          flash[:notice] = "error" 
          render "new"
      end

    ...

app/views/arts/new.html.erb

<h1>Arts#new</h1>
<p>Find me in app/views/arts/new.html.erb</p>
<%= form_for(@art, :url => arts_path, :html => { :multipart => true }) do |f| %>
    <%= f.label :name %> <br/>
    <%= f.text_field :name %> <br/>

    <%= f.label :description %> <br/>
    <%= f.text_field :description %> <br/>

    <%= f.label :avatar %> <br/>
    <%= f.file_field :avatar %> <br/>
    <%= f.submit %>
<% end %>

I searched the web for 2 days now but I cannot find my error. Here is the response from the server:

POST "/arts/new" for 127.0.0.1 at 2012-12-19 12:11:39 +0100
    Processing by ArtsController#new as HTML
      Parameters: {"utf8"=>"✓", "authenticity_token"=>"ZyZFfSaTl9CQpL5kOXyt/rcoi+SCuNp5/deCYda83sE=", "art"=>{"name"=>"asdf", 
"description"=>"asdf", 
"avatar"=>#<ActionDispatch::Http::UploadedFile:0x0000000296e0b8 @original_filename="lakritz10.jpg", 
@content_type="image/jpeg", 
@headers="Content-Disposition: form-data; name=\"art[avatar]\"; filename=\"lakritz10.jpg\"\r\nContent-Type: image/jpeg\r\n", @tempfile=#<File:/tmp/RackMultipart20121219-5804-1rnvkmj>>}, 
"commit"=>"Create Art

So can anyone help me to fix this?

thanks in advance.

EDIT: It seems like even without an attachment that nothing is getting saved in the database. Thats wired…

EDIT_SOLUTION: In order to solve my particular problem I had to change the routes.rb
I previously assumed that the entry

match "arts/new", :to => "arts#new", :as => 'arts'

would do the job. This was not the case.
I had to change the line into:

resources :arts

Because i do not understand how routes exactly work yet, I cannot explain it.

Answer 1

Your line:

match "arts/new", :to => "arts#new", :as => 'arts'

only creates a route to the new action. It maps arts_path to arts/new which is then the target of your form. You really need to submit the form to arts#create which is what the resource does automatically for a POST with a new object.