[Sqlalchemy-tickets] Issue #3845: back_populates does not work with lazy="noload" (zzzeek/sqlalchemy)

[Yegor R. <iss...@bi...>]

New issue 3845: back_populates does not work with lazy="noload"
https://bitbucket.org/zzzeek/sqlalchemy/issues/3845/back_populates-does-not-work-with-lazy

Yegor Roganov:

Other side of relationship is not populated when relationship declared with `lazy="noload"`, though it works with `lazy=True`. If this is by design, docs should probably mention this.


Here is the code:



```
#!python
from sqlalchemy import Column, Integer, ForeignKey
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship


Base = declarative_base()


class User(Base):
    __tablename__ = 'users'

    id = Column(Integer, primary_key=True)
    addresses = relationship("Address", lazy="noload", back_populates="user")


class Address(Base):
    __tablename__ = 'addresses'
    id = Column(Integer, primary_key=True)
    user_id = Column('user_id', Integer, ForeignKey('users.id'))
    user = relationship("User")


a1 = Address()
u = User()
u.addresses.append(a1)
assert a1.user == u


```