Sinatra

You can use Job's to_response method like so:

app = Dragonfly[:images].configure_with(:imagemagick)

get '/images/:size.:format' do |size, format|
  app.fetch_file('~/some/image.png').thumb(size).encode(format).to_response(env)
end

to_response returns a rack-style response array with status, headers and body.

NOTE: uids from the datastore currently have slashes and dots in them so may cause problems when using ':uid' as a path segment.

or you can mount as a middleware, like in rails:

Dragonfly[:images].configure_with(:imagemagick) do |c|
  c.url_path_prefix = '/media'
end

use Dragonfly::Middleware, :images, '/media'

get '/' #... do
  # ...