Note to self: read docs better.
I had to add a cascade='delete' in the backref. I tried this the first
time, but put it in the relationship instead of the backref.
class Post(Base):
__tablename__ = 'posts'
id = Column(Integer, primary_key=True)
title = Column(String(255), nullable=False)
body = Column(Text, nullable=False)
user_id = Column(Integer, ForeignKey(User.id, ondelete='CASCADE'),
nullable=False)
user = relationship(User, backref=backref('posts', cascade='delete'))
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