NoMethodError (undefined method `file_identifier' for #<Document:0x27117a8>):

[ghost]

Hi,

I get NoMethodError (undefined method 'file_identifier' for #<Document:0x27117a8>) when I try to save a form with attachement.

new.haml

= simple_form_for @document, :remote => true, :novalidate => true do |form|
  %p#errors{:style => 'display:none'}

  %p
    Title
    = form.text_field :title, :required => true

  %p
    Description
    = form.text_field :description, :required => true

  %p
    File to upload
    = form.file_field :file, id: 'file'

  .clear
  .action_bar
    %input.button.blue.small{type: "submit", value: "Submit"}
    %a.button.red.small
      %span.glyph.cross
      Annuler

document.rb (model)

class Document < ActiveRecord::Base
  attr_accessible :description, :file, :title

  validates :title, :description, presence: true
  validates_attached_presence :file

  has_attached :file
end

schema

  create_table "documents", :force => true do |t|
    t.string   "title"
    t.text     "description"
    t.integer  "company_id"
    t.datetime "created_at",        :null => false
    t.datetime "updated_at",        :null => false
    t.string   "file_file_name"
    t.string   "file_content_type"
    t.integer  "file_file_size"
    t.datetime "file_updated_at"
  end

POST REQUEST

Started POST "/documents" for 127.0.0.1 at 2012-07-31 15:09:50 +0200
Processing by DocumentsController#create as JS
  Parameters: {"utf8"=>"V", "authenticity_token"=>"DVrcEoFETW+iohGHFa1GdvRPjnmGbcaGpiWhLnZbXOc=", "document"=>{"title"=
"dd", "description"=>"dd"}}
  ←[1m←[35mUser Load (0.0ms)←[0m  SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1  [["id", 3]]
  ←[1m←[36mCompany Load (0.0ms)←[0m  ←[1mSELECT "companies".* FROM "companies" WHERE "companies"."id" = 3 LIMIT 1←[0m
Completed 500 Internal Server Error in 4ms

NoMethodError (undefined method `file_identifier' for #<Document:0x27117a8>):
  app/controllers/documents_controller.rb:30:in `create'


  Rendered C:/Ruby193/lib/ruby/gems/1.9.1/gems/actionpack-3.2.7/lib/action_dispatch/middleware/templates/rescues/_trace
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tics.erb within rescues/layout (36.0ms)

documents_controller

  def create
    ....
    ....

    @document =Document.new(params[:document])

    if @document.valid?
      @document.save
    end

    ....
    ....
  end

Thank you.

[ksylvest]

Hi Yassine.

Thanks for the detailed overview. The error is occurring because your database doesn't have the correct columns. In order for attached to work you need: 'file_identifier' (string), 'file_extension' (string) and 'file_size' (integer). Substitute the name of the file within the application for 'file' (example: 'avatar_identifier', 'avatar_extension' and 'avatar_size'). In your migration you can use the 'attachment' type to generate all three columns at once (see read me). If this doesn't fix your problem feel free to reopen the issue!