Hello everyone!

I've designed invitation model
class User(Base):
__tablename__ = 'user'

id = Column(Integer, primary_key=True)
name = Column(String(64))
email = Column(String(64))
class Invitation(Base):
__tablename__ = 'invitation'

id = Column(Integer, primary_key=True)
sender_id = Column(Integer, ForeignKey('user.id'))
invitee_id = Column(Integer, ForeignKey('user.id'), unique=True)
sender = relationship('User', foreign_keys=[sender_id], backref='invite_list
')
invitee = relationship('User', foreign_keys=[invitee_id], backref='
invited_by', uselist=False)

email = Column(String)
phone = Column(String)
token = Column(String)

My logic is:

1. Create a new record in Invitation table: sender_id - current user, email 
or phone and unique generated token.
2. Create a new record in User table keep received token, commit it.
3. Find a record in Invitation table by filter token and update filed 
invitee_id == new_user.id


My problem is backref return value for invited_by - return (of course) 
Invitation record. 
My question is whether I've possibility return for invited_by User record 
via Invitation table or not?


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