Question

我有一个视图，它从CSV文件创建模型。我已经为模型类定义添加了clean方法，但是在创建模型时不会调用它。

以下是models.py的示例：

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)

以下是我的表单视图代码示例：

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)

导入器执行实际验证并为每个模型调用create方法。

Answer 1

要调用模型清理方法，我们将覆盖save方法。检查链接：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)

Answer 2

我找到了覆盖方法的解决方案：

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')

但我不确定这是一个好的决定。

Answer 3

显然，从不调用model.clean（）来确保向后兼容性。有关详细信息：https://code.djangoproject.com/ticket/13100

Answer 4

显然在较新版本的Django中，ModelForm.full_clean确实称它为实例的full_clean方法：

https://github.com/django/django/blob/14e2b1/django/forms/models.py#L403

Django没有调用模型清理方法

4 个答案: