def add_to_app(self, app, **kwargs):

        raise NotImplementedError('add_to_app must be overridden')
When a file is modified, thumbnails are built for all matching and
dataset/ETHPy150Open thisissoon/Flask-Via/flask_via/routers/__init__.py/BaseRouter.add_to_app--crossover with--dataset/ETHPy150Open SmileyChris/easy-thumbnails/easy_thumbnails/tests/test_aliases.py/GlobalGenerationTest.test_changed