routing.yml

sf_image:
  class: sfImageTransformRoute
  url:   /thumbnails/:type/:format/:path/:slug-:id.:sf_format
  param: { module: sfImageTransformator, action: index, attribute: file }
  requirements:
    format:    '[\w_-]+'
    path:      '[\w/]+'
    slug:      '[\w_-]+'
    id:        '\d+(?:,\d+)?'
    sf_format: 'gif|png|jpg'
    sf_method: [ get ]
  options:
    image_source: Doctrine # or Propel
    segment_separators: [ '/', '.', '-' ]