Inspect whether a path of properties is eagerloaded or not. (Hack)

gistfile1.pyw

# Helper methods for an SQLAlchemy declarative base class.

    def _is_loaded(self, key):
        return key in self.__dict__

    def _is_loaded_all(self, path):
        """
        Check if the given path of properties are eager-loaded.
        `path` is similar to sqlalchemy.orm.eagerload_all, checking happens
        by inspecting obj.__data__.
        """
        current = self
        for k in path.split('.'):
            if not current._is_loaded(k):
                return False
            current = getattr(current, k)
            if not current:
                return False
            if isinstance(current, list):
                current = current[0]

        return True