I have a model with an ID column set as the primary key, though i'd like to be
able to identify records by 3 other columns.
For this situation, I've added a classmethod that will fetch the record if
found or a new record if not.
The problem i'm having is that every once in a while, I get IntegrityError
trying to flush a change
class Foo(Base):
__table_args__ = (sa.UniqueConstraint('bar', 'baz', 'qux'),)
id = sa.Column(Identifier, sa.Sequence('%s_id_seq' % __tablename__),
nullable=False, primary_key=True)
bar = sa.Column(sa.BigInteger)
baz = sa.Column(sa.BigInteger)
qux = sa.Column(sa.BigInteger)
a1 = sa.Column(sa.BigInteger)
a2 = sa.Column(sa.BigInteger)
@classmethod
def get(cls, bar=None, baz=None, qux=None, **kwargs):
item = session.query(cls).\
filter(cls.bar== bar).\
filter(cls.baz == baz).\
filter(cls.qux == qux).\
first()
if item:
for k, v in kwargs.iteritems():
if getattr(item, k) != v:
setattr(item, k, v)
else:
item = cls(bar=bar, baz=baz, qux=qux, **kwargs)
return item
This is the code I use to add/update records:
foo = Foo.get(**item)
session.merge(foo)
I'm struggling with this problem for some time now, and would appreciate any
help ...
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