def add_friend(self, other):
if self != other:
if other not in self.friends:
self.friends.append(other)
if self not in other.friends:
other.friends.append(self)
db_session.flush()
def remove_friend(self, other):
if other.best_friend == self:
other.best_friend = None
# Needed to avoid sqlalchemy.exc.CircularDependencyError
db_session.flush()
if self.best_friend == other:
self.best_friend = None
if self not in other.friends:
raise Exception
self.friends.remove(other)
other.friends.remove(self)
db_session.flush()
def make_best_friend(self, other):
if other not in self.friends:
raise Exception
self.best_friend = other
db_session.flush()
