Django не вызывает метод очистки модели

У меня есть представление, которое создает модели из файла CSV. Я добавил чистый метод к определению класса модели, но он не вызывается при создании модели.

Вот пример models.py:

class Run(models.Model):
    name = models.CharField(max_length=120)
    tested_build = models.ForeignKey('apps.Build')
    timestamp_start = models.DateTimeField()
    timestamp_end = models.DateTimeField()

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

    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')


class ClientMeasurement(CommonMeasurement):
    metric = models.ForeignKey(ClientMetric)
    account = models.CharField(max_length=120, blank=True)

Вот мои примеры кода формы формы:

class BaseMeasurementsUpload(generic_views.FormView):
    template_name = 'upload.html'
    models_to_upload = None   

    def get_success_url(self):
        return self.request.get_full_path()

    def form_valid(self, form):
        uploader = getattr(importers, form.cleaned_data['uploader'])
        try:
            the_uploader = uploader(form.cleaned_data, self.models_to_upload)
            upload_results = the_uploader.get_result_info()
        except django_exceptions.ValidationError as e:
            custom_errors = e
        return render_to_response(self.template_name,
                                  {'upload_results': upload_results,
                                   'custom_errors': custom_errors},
                                  context_instance=RequestContext(self.request))


class ClientMeasurementsUploadView(BaseMeasurementsUpload):
    form_class = forms.ClientMeasurementsUploadForm
    models_to_upload = models.ClientMeasurement

    def get_form(self, form_class):
        uploaders = (('MeasurementsSimpleCsv', importers.MeasurementsSimpleCsv.__doc__),
                     ('ClientMeasurementsBulkCsv', importers.ClientMeasurementsBulkCsv.__doc__,))
        if self.request.POST:
            # get bound form
            return self.form_class(uploaders,
                                   self.request.POST,
                                   self.request.FILES)
        else:
            return forms.ClientMeasurementsUploadForm(uploaders)

выполняют фактическую проверку и метод создания вызова для каждой модели.

Ответы

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')

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)