Uploading files to Rackspace in a Rails app using Paperclip + Fog

paperclip-rackspace.rb

# config/initializers/paperclip.rb
#######################################

RACKSPACE_CONFIG = {
  'production' => {
    path: '',
    storage: :fog,
    fog_credentials: {
      provider: 'Rackspace',
      rackspace_username: ENV['RACKSPACE_USERNAME'],
      rackspace_api_key: ENV['RACKSPACE_API_KEY'],
      persistent: false
    },
    fog_directory: 'static',
    fog_public: true
  },
  'development' => {
    path: '',
    storage: :fog,
    fog_credentials: {
      provider: 'Rackspace',
      rackspace_username: 'mydevuser',
      rackspace_api_key: 'mydevkey',
      persistent: false
    },
    fog_directory: 'static',
    fog_public: true
  }
}

Paperclip::Attachment.default_options.update(RACKSPACE_CONFIG[Rails.env])

# in a model
#########################

# Can easily replace the static 'my_file' with the actual uploaded
# filename using ':filename'
has_attached_file :my_file, path: "#{Rails.env}/my_model/:id/my_file.:extension"

# and in the controller
################################

def upload_file
  @model = Model.find(params['id'])
  not_found if @model.nil?

  @model.update_attributes(params['model'])
end

# in a view/form
#############################
<%= form_for @model, url: upload_file_model_path, html: {multipart: true} do |f| %>
  <%= f.label 'My File' %>
  <%= f.file_field :my_file %>
  <%= f.submit 'Upload' %>
<% end %>