У меня есть два класса, User и Address. У пользователя может быть много адресов и один адрес по умолчанию. Я попробовал этот код SQLAlchemy.
from sqlalchemy import create_engine
from sqlalchemy import Column, Integer, String
from sqlalchemy import ForeignKey
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker, relationship
engine = create_engine('sqlite:///:memory:', echo=True)
Base = declarative_base()
class User(Base):
__tablename__ = 'users'
id = Column(Integer, primary_key=True)
default_address_id = Column(Integer, ForeignKey('addresses.id'))
name = Column(String)
fullname = Column(String)
nickname = Column(String)
addresses = relationship("Address", order_by="Address.id", back_populates="user")
class Address(Base):
__tablename__ = 'addresses'
id = Column(Integer, primary_key=True)
email_address = Column(String, nullable=False)
user_id = Column(Integer, ForeignKey('users.id'))
user = relationship("User", back_populates="addresses")
Base.metadata.create_all(engine)
Это приводит к ошибке
sqlalchemy.exc.AmbiguousForeignKeysError: Could not determine join condition between parent/child tables on relationship User.addresses - there are multiple foreign key paths linking the tables. Specify the 'foreign_keys' argument, providing a list of those columns which should be counted as containing a foreign key reference to the parent table.
Я попытался добавить foreign_keys в отношения, но не смог сделать это правильно.