class BasicModel(Model):
"""
Adds the common properties created, created_by, modified, and modified_by to :class:`Model`
"""
created = ndb.DateTimeProperty(auto_now_add=True)
created_by = ndb.UserProperty(auto_current_user_add=True)
modified = ndb.DateTimeProperty(auto_now=True)
modified_by = ndb.UserProperty(auto_current_user=True)