routes.py

from flask.ext.classy import route

class ModelView(BaseView):

    @route('/<int:entity_id>')
    @route('/<int:entity_id>/<string:relationship>')
    def get(self, entity_id, relationship=None): 
        # Available routes will be:
        # http://domain.com/<prefix>/<model_view_subclass>/<id>
        # http://domain.com/<prefix>/<model_view_subclass>/<id>/<relationship>
        # model_view_subclass: if class is BookmarksView => model_view_subclass = 'bookmarks'
        pass