Hi All,
I have a mixin defined like this:
def add_exclude_constraint(mapper, class_):
table = class_.__table__
elements = [('period', '&&')]
for col in table.primary_key.columns:
if col.name!='period':
elements.append((col, '='))
table.append_constraint(ExcludeConstraint(*elements))
class Temporal(object):
@declared_attr
def __table_args__(cls):
listen(cls, 'instrument_class', add_exclude_constraint)
return (
CheckConstraint("period != 'empty'::tsrange"),
)
period = Column(DateTimeRange(), nullable=False, primary_key=True)
That listen call is the source of the dirty feeling...
What's the "right" way to do this?
Chris
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