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)