Everyone, thanks for all the help! I came up with this validator:
class DateCompare(validators.FancyValidator):
"""
Make sure that the stop time comes after the start time.
"""
messages = dict(
invalid = "The start date needs to be before the stop date"
)
def validate_python(self, field_dict, state):
log.debug("locals inside validate_python: %s" % locals())
start_date = field_dict['start_date']
stop_date = field_dict['stop_date']
if start_date >= stop_date:
msg = self.message('invalid', state)
raise validators.Invalid(msg, field_dict, state,
error_dict=dict(stop_date=msg))
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