Question

I am using this upload file example.

And I am trying to modify a :url of the attached file.It does not work somehow.I get this error in the terminal:

NoMethodError (undefined method `upload_file_size' for #<Paperclip::Attachment:0x8ca35e8>):

My upload.rb:

class Upload < ActiveRecord::Base
  attr_accessible :upload, :upload_file_name, :upload_file_size

Paperclip::interpolates :upload_file_size do |attachment, style|
  attachment.instance.upload_file_size
end
  has_attached_file :upload,

                    :url =>"/system/Files/CEL-Files/:upload_file_size/:basename.:extension",
                    :path =>":rails_root/public/system/Files/CEL-Files/:piks/:basename.:extension"

  include Rails.application.routes.url_helpers

And this is my schema.rb:

ActiveRecord::Schema.define(:version => 20120731045929) do

  create_table "uploads", :force => true do |t|
    t.string   "upload_file_name"
    t.string   "upload_content_type"
    t.string   "user"
    t.integer  "upload_file_size"
    t.datetime "upload_updated_at"
    t.datetime "created_at",          :null => false
    t.datetime "updated_at",          :null => false
  end

end

Thanks in advance

Answer 1

The symbol/string you are using in Paperclip interpolation is conflicting with your model attribute “upload_file_size”. Try changing Paperclip interpolation custom name from “upload_file_size” to something else. Like below :

Paperclip::interpolates :size_of_file do |attachment, style|
  attachment.instance.upload_file_size
end