Python django.forms.forms 模块，ValidationError() 实例源码

def clean(self, value):
        if value:
            # Si se reciben valores (id's de Tpvs), cargarlos para comprobar si son todos del mismo tipo.
            # Construimos un ValuesQuerySet con sólo el campo "type", hacemos la cuenta y ordenamos en orden descendente para comprobar el primero (esto es como hacer un "group_by" y un count)
            # Si el primero es mayor que 1 mostramos el error oportuno.
            count = models.VPOS.objects.filter(id__in=value).values("type").annotate(Count("type")).order_by(
                "-type__count")
            if count[0]["type__count"] > 1:
                raise forms.ValidationError("Asegúrese de no seleccionar más de un TPV del tipo '{0}'".format(
                    dict(models.VPOS_TYPES)[count[0]["type"]]))
        return super(VPOSField, self).clean(value)

def validate_url(data, query):
    """
    Checks if the given url contains the specified query. Used for custom url validation in the ModelForms
    :param data: full url
    :param query: string to search within the url
    :return:
    """
    if data and query not in data:
        raise forms.ValidationError('Please enter a valid {} url'.format(query))

def clean(self, *args, **kwargs):
        data = super(SizeAndContentTypeRestrictedImageField, self).clean(*args, **kwargs)

        file = data.file
        try:
            content_type = file.content_type
            if content_type in self.content_types:
                if file._size > self.max_upload_size:
                    raise forms.ValidationError(_('Please keep filesize under %s. Current filesize %s') % (filesizeformat(self.max_upload_size), filesizeformat(file._size)))
            else:
                raise forms.ValidationError(_('Filetype not supported.'))
        except AttributeError:
            pass

        return data

def clean(self, *args, **kwargs):
        data = super(ContentTypeRestrictedFileField, self).clean(*args, **kwargs)

        file = data.file
        try:
            content_type = file.content_type
            if content_type in self.content_types:
                if file._size > self.max_upload_size:
                    raise forms.ValidationError(_('Please keep filesize under %s. Current filesize %s') % (filesizeformat(self.max_upload_size), filesizeformat(file._size)))
            else:
                raise forms.ValidationError(_('Filetype not supported.'))
        except AttributeError:
            pass

        return data

def test_invalid_key_data(self):
        form = KeyForm(data={
            'key': "The cat in the hat didn't come back after that",
            'use_asc': False,
        })
        self.assertFalse(form.is_valid())

        form.cleaned_data = form.data
        with self.assertRaises(forms.ValidationError):
            form.clean_key()