Ok, this seems to do the trick for my use case, but I'd be curious to
see if there's a better way or if there are things that should be
fixed here.
from types import IntType, LongType
from sqlalchemy.exc import ArgumentError
from sqlalchemy import event
from sqlalchemy.orm import mapper
def _check_integral_type(target, value, oldvalue, initiator):
if not isinstance(value, IntType) and not isinstance(value,
LongType):
raise ArgumentError("value is not numeric")
return value
@event.listens_for(mapper, "mapper_configured")
def _setup_int_listeners(mapper, class_):
for prop in mapper.iterate_properties:
if hasattr(prop, 'columns'):
if isinstance(prop.columns[0].type, Integer):
event.listen(getattr(class_, prop.key), "set",
_check_integral_type, retval=True)
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