Django doesn't call model clean method

To call the model clean method we will override save method. Check the link: https://docs.djangoproject.com/en/2.0/ref/models/instances/#django.db.models.Model.clean

class CommonMeasurement(models.Model):
    timestamp = models.DateTimeField()
    value = models.FloatField()
    run = models.ForeignKey(Run)

    def clean(self):
        if self.timestamp < self.run.timestamp_start or self.timestamp > self.run.timestamp_end:
            raise django_excetions.ValidationError('Measurement is outside the run')

    def save(self, *args, **kwargs):
        self.full_clean()
        return super(CommonMeasurement, self).save(*args, **kwargs)

I've found a solution to override method:

class CommonMeasurement(models.Model):
    timestamp = models.DateTimeField()
    value = models.FloatField()
    run = models.ForeignKey(Run)

    objects = models.Manager()
    analyzes = managers.MeasureStatManager()

    def save(self, **kwargs):
        self.clean()
        return super(CommonMeasurement, self).save(**kwargs)

    def clean(self):
        super(CommonMeasurement, self).clean()
        print 'here we go'
        if self.timestamp < self.run.timestamp_start or self.timestamp > self.run.timestamp_end:
            raise django_excetions.ValidationError('Measurement is outside the run')

But I'm not sure that it can be a good decision.

Apparently model.clean() is never called to ensure backward compatibility. For more information on this: https://code.djangoproject.com/ticket/13100