clean() method in model and field validation

Question

I have a problem with a model\'s clean() method and basic field validation. here\'s my model and the clean() method.

class Trial(mo         


        

Answer 1

I'm struggling with a similar issue but with a ForeignKey. In your case, I would just check that the fields are not empty, and I would simplify your Boolean expressions:

class Trial(models.Model):

    trial_start = DurationField()
    movement_start = DurationField()
    trial_stop = DurationField()


    def clean(self):
        from django.core.exceptions import ValidationError
        if self.trial_start:
            if self.movement_start and self.movement_start < self.trial_start:
                raise ValidationError('movement start must be >= trial start')
            if self.trial_stop:
                if self.trial_stop <= self.trial_start:
                    raise ValidationError('trial stop must be > trial start')
                if self.movement_start:
                    if self.trial_stop < self.movement_start:
                        raise ValidationError('trial stop must be >= movement start')