@staticmethod
    def validate(options):
        try:
            if options.backends.index('modelinstance') > options.backends.index('model'):
                raise Exception("Metadata backend 'modelinstance' must come before 'model' backend")
        except ValueError:
            raise Exception("Metadata backend 'modelinstance' must be installed in order to use 'model' backend")
Validates the application of this backend to a given metadata
dataset/ETHPy150Open willhardy/django-seo/rollyourown/seo/backends.py/ModelBackend.validate