model missing required attr_accessor for 'photo_file_name' when uploading with paperclip and S3 on heroku

Question

Setting up paperclip with S3 in my linux dev environment was a snap -- everything works out of the box. However, I can\'t get it to work on Heroku.

When I try to do

Answer 1

Well, this message seems to be because the columns it's missing. Try create a migration creating the columns:

class AddPhotoToEvent < ActiveRecord::Migration
  def change
    add_column :events, :photo_file_name,    :string
    add_column :events, :photo_content_type, :string
    add_column :events, :photo_file_size,    :integer
    add_column :events, :photo_updated_at,   :datetime
  end

end

This work for me, here i have a table events with photo

Answer 2

Error like this occurs if you create wrong column type in migration. When you define new table migration for paperclip, you need to specify t.attachment :name insted of t.string :name. Or add_attachment :table, :name when you add new paperclip column in existed table. And now you don't need to add these attributes in attr_accessor in model.

Answer 3

Found the problem: needed to update the database.

heroku run rake:db:migrate

heroku restart

I had done what I thought would have accomplished the same thing already:

heroku rake db:schema:load

but perhaps that doesn't work or something went wrong in the process.