= Attached

Attached is a Ruby on Rails file attachment tool that lets users upload to the cloud, then process in the cloud. The gem supports AWS, Google and Rackspace for storage networks by default. It is influenced (and copied) from Paperclip.

== Requirements

The gem has only been tested with Ruby 1.9.2 and Rails 3.0.3 but may well work with other versions of Ruby and Rails.

== Installation

  gem install attached
  
== Examples

Migration:

  class CreateVideo < ActiveRecord::Migration
    def self.up
      create_table :videos do |t|
        t.string :encoding_identifier
        t.string :encoding_extension
        t.integer :encoding_size

        t.timestamps
      end
    end

    def self.down
      drop_table :videos
    end
  end

Model:
  
  has_attached :encoding, :styles => { 
    :mp4_720p => { :extension => '.mp4' },
    :mp4_480p => { :extension => '.mp4' },
    :ogg_720p => { :extension => '.ogv' },
    :ogg_480p => { :extension => '.ogv' },
  }
  
  after_save do
    remote.encode(self.encoding.url)
  end
  
Form:

  <%= form_for @video, :html => { :multipart => true } do |form| %>
    <%= form.file_field :encoding %>
  <% end %>
  
View:

  <video>
    <source src="<%= @video.encoding.url(:mp4_480p) %>" />
    <source src="<%= @video.encoding.url(:ogg_480p) %>" />
  </video>
  
== Advanced

=== Validations

  # app/models/person.rb
  validates_attached_presence :avatar
  validates_attached_size :avatar, :in => 2.kilobytes..2.megabytes

==== Storage
  
  # app/models/person.rb
  has_attached :avatar, :medium => :aws, :credentials => "#{Rails.root}/config/aws.yml"
  
  # app/models/person.rb
  has_attached :avatar, :medium => :google, "#{Rails.root}/config/google.yml"
  
  # app/models/person.rb
  has_attached :avatar, :medium => :rackspace, "#{Rails.root}/config/rackspace.yml"
  
  # config/initializers/attached.rb
  Attached::Attachment.options[:medium] = :aws
  Attached::Attachment.options[:credentials] = "#{Rails.root}/config/aws.yml"
  
  # config/initializers/attached.rb
  Attached::Attachment.options[:medium] = :google
  Attached::Attachment.options[:credentials] = "#{Rails.root}/config/google.yml"
  
  # config/initializers/attached.rb
  Attached::Attachment.options[:medium] = :rackspace
  Attached::Attachment.options[:credentials] = "#{Rails.root}/config/rackspace.yml"
  
=== Processor

  # app/models/person.rb
  has_attached :avatar, :processor => :image, :styles => {
    :small => { :size => '200x200<', :extension => 'png' },
    :large => { :size => '400x400>', :extension => 'png' },
    :default => { :size => '300x300#' },
  }
  
=== Aliases

  # app/initializer/attached.rb
  Attached::Attachment.options[:alias] = http://c0378198.cdn2.cloudfiles.rackspacecloud.com

  # app/initializer/attached.rb
  Attached::Attachment.options[:aliases] = %w(
    http://d1kf5um3mxa8kv.cloudfront.net/
    http://d3d5wf186mp1rv.cloudfront.net/
    http://d2wmfkw6rydl1g.cloudfront.net/
    http://d1gqpdc40l7s16.cloudfront.net/
  )
  
== Copyright

Copyright (c) 2010 Kevin Sylvestre. See LICENSE for details.