Attached

Attached is a Ruby on Rails file attachment tool that lets users upload to the cloud. The gem supports AWS, Google and Rackspace for storage networks by default. It is influenced (and copied) from Paperclip and makes heavy use of the incredibly awesome Fog library.

Requirements

The gem is tested with:

Ruby on Rails 4.1.1
Ruby on Rails 4.0.5
Ruby 2.1.2
Ruby 2.0.0
Ruby 1.9.3
JRuby

Installation

gem install attached

Optional

brew install imagemagick brew install lame

Examples

Migration:

rails g model video name:string encoding:attached

class CreateVideo < ActiveRecord::Migration
  def self.up
    create_table :videos do |t|
      t.string :name
      t.attachment :encoding

      t.timestamps
    end
  end

  def self.down
    drop_table :videos
  end
end

Model:

class Video < ActiveRecord::Base

  has_attached :encoding, styles: { 
    webm: { extension: '.webm' },
    mp4:  { extension: '.mp4'  },
    ogv:  { extension: '.ogv'  },
  }

  after_save do
    remote.encode(self.encoding.url)
  end

end

Form:

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

View:

<video>
  <source src="<%= @video.encoding.url(:webm)" />
  <source src="<%= @video.encoding.url(:mp4) %>" />
  <source src="<%= @video.encoding.url(:ogg) %>" />
</video>

Advanced

Validations

# app/models/person.rb
validates_attached_presence :file
validates_attached_size :file, in: 2.kilobytes..2.megabytes
validates_attached_extension :file, in: %w(jpe jpg jpeg png)

Storage

# app/models/user.rb
has_attached :file, medium: :aws, credentials: "#{Rails.root}/config/aws.yml"

# app/models/user.rb
has_attached :file, medium: :google, credentials: "#{Rails.root}/config/google.yml"

# app/models/user.rb
has_attached :file, medium: :rackspace, credentials: "#{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"

Processors

# app/models/image.rb
has_attached :file, processor: :image, styles: {
  small:   { size: '200x200>', extension: '.jpg', quality: 90 },
  large:   { size: '400x400<', extension: '.jpg', quality: 90 },
  default: { size: '300x300#', extension: '.jpg', quality: 90 },
}

# app/models/image.rb
has_attached :file, processor: :image, styles: {
  small:   { operation: :decrease, width: 200, height: 200, extension: '.jpg', quality: 90 },
  large:   { operation: :increase, width: 400, height: 400, extension: '.jpg', quality: 90 },
  default: { operation: :resize,   width: 300, height: 300, extension: '.jpg', quality: 90 },
}

# app/models/audio.rb
has_attached :file, processor: :audio, styles: {
  full:  { preset: '320kbps', extension: '.wav' },
  large: { preset: '256kbps', extension: '.wav' },
  small: { preset: '128kbps', extension: '.wav' },
}

# app/models/audio.rb
has_attached :file, processor: :audio, styles: {
  full:  { preset: '320kbps', extension: '.wav' },
  large: { preset: '256kbps', extension: '.wav' },
  small: { preset: '128kbps', extension: '.wav' },
}

# app/models/audio.rb
has_attached :file, processor: :audio, styles: {
  full:  { preset: 'insane',  extension: '.wav' },
  large: { preset: 'extreme', extension: '.wav' },
  small: { preset: 'medium',  extension: '.wav' },
}

Strategies

# app/models/sample.rb
has_attached :file, processor: ..., styles: { ... }, strategy: :delay
has_attached :file, processor: ..., styles: { ... }, strategy: :cache

Reprocessing

rake attached:process[Image,file]
rake attached:process[Audio,file]

Aliases

# app/initializer/attached.rb
Attached::Attachment.options[:alias] = "https://storage.ksylvest.com/"

# app/initializer/attached.rb
Attached::Attachment.options[:aliases] = %w(
  https://a.storage.ksylvest.com/
  https://b.storage.ksylvest.com/
  https://c.storage.ksylvest.com/
  https://d.storage.ksylvest.com/
)

Metadata

# app/initializers/attached.rb
Attached::Attachment.options[:metadata] = { 'Cache-Control' => 'max-age=3153600' }