I have 2 classes:
Base = declarative_base()
class Parent(Base):
__tablename__ = 'parent'
id = Column(Integer, primary_key=True)
children = relationship("Child", cascade="all")
class Child(Base):
__tablename__ = 'child'
id = Column(Integer, primary_key=True)
parent_id = Column(Integer, ForeignKey('parent.id'),
nullable=False)
details = Column(Text(), nullable=False)
I recently added nullable=False to the Child.parent_id column, and now
the following code produces an error.
p = self.session.query(Parent).filter_by(id=1234).one()
p.children = [Child(details=x) for x in x_list] # don't think
content of x_list is relevant
self.session.commit()
File "C:\Python27\lib\site-packages\sqlalchemy-0.7.1-py2.7.egg
\sqlalchemy\engine\default.py", line 325, in do_execute
cursor.execute(statement, parameters)
IntegrityError: (IntegrityError) child.parent_id may not be NULL
u'UPDATE child SET parent_id=? WHERE child.id = ?' (None, 1)
Why is it generating this particular UPDATE statement? Shouldn't it
add the correct parent_id from the Parent object, not None? Even if I
add 'parent_id=1234' into the Child() constructor, it still attempts
to set parent_id to None with this UPDATE.
What am I doing wrong?
--
Ben Sizer
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