File Uploads in Ruby on Rails

Submitted by Karthikeyan on Thu, 25/10/2012 - 19:28

Simple File Upload Application in Ruby on Rails.
This program uploads any type of file to the uploads directory under public folder and stores the file name in database.

Procedure :-

  1. Create database fileuploads through mysql command line or phpmyadmin or Netbeans Services Tab
  2. Create new project and provide the database information
  3. Generate scaffold Upload with argument filename:string
  4. Change the code for Model upload.rb as given below
  5. Change the code for views/uploads/new.html.erb as given below
  6. Delete Public\index.html
  7. Create folder 'Uploads' under Public folder
  8. Edit the Configuration\routes.rb to point uploads controller. map.root :controller => "uploads"
  9. Migrate Database
  10. Execute the application

Model : Upload


class Upload < ActiveRecord::Base
   UPLOAD_STORE = File.join RAILS_ROOT, 'public','Uploads'
  after_save:save_upload
  def load_photo_file=(data)
    self.filename=data.original_filename
    @upload_data=data
  end
  def save_upload
    if @upload_data
      name=File.join UPLOAD_STORE, self.filename
      File.open(name,'wb')do |f|
        f.write(@upload_data.read)
      end
      @upload_data=nil
    end
  end
end

Views : new.html.erb


<h1>New upload</h1>
<% form_for(:upload,@upload, :url => {:action=>'create'}, :html=>{:multipart=>true}) do |f| %>
  <%= f.error_messages %>
  <p>
    <%= f.label "Open File" %><br />
    <%= f.file_field :load_photo_file  %>
  </p>
  <p>
    <%= f.submit 'Upload' %>
  </p>
<% end %>
<%= link_to 'Back', uploads_path %>