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class Parent(Base):как получить всех Parent у кого Child.date != Null
__tablename__ = 'parents'
id = Column(Integer, primary_key=True)
child = relationship("Child", backfer='parents')
class Child(Base):
__tablename__ = 'childrens'
id = Column(Integer, primary_key=True)
date = Column(Datetime, default=None)
parent_id = Column(Integer, ForeignKey('parents.id')
session.query(Parent).filter(Parent.child.date.isnot(None))- выдает ошибку
AttributeError: Neither 'InstrumentedAttribute' object nor 'Comparator' object associated with Parent.child has an attribute 'date'```
for i in session.query(Parent).filter(Parent.child):то все норм
print(i.child.date)
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