Django pre_save 信号在保存模型而不是模型窗体时起作用？

Question

我创建了一个 pre_save 信号来检查在保存模型之前字段是否已更新，如果是，则关闭 webhook。当我从 ./manage.py shell 编辑模型并保存它时，这工作正常，但如果我在使用表单的网站上编辑它，它不会触发 webhook。这是为什么呢？

apps.py

from django.apps import AppConfig


class ClientConfig(AppConfig):
    name = 'client'
    verbose_name = "Clients"
    label = 'client'

    def ready(self):
        import client.signals

信号.py

@receiver(pre_save, sender=ClientContact)
def send_hook_on_roadmap_update(sender, instance, **kwargs):
    """Watches for ClientContacts to be saved and checks to see if the
    pipeline attribute has changed.
    """
    try:
        obj = sender.objects.get(pk=instance.pk)
    except sender.DoesNotExist:
        pass  # Object is new, so field hasn't technically changed
    else:
        if not obj.pipeline == instance.pipeline:  # Field has changed
            instance.pipeline_updated()

models.py

class ClientContact(models.Model):
    title = models.CharField(_("Title"), max_length=50, blank=True, null=True)
    first_name = models.CharField(_("First name"), max_length=30, )
    last_name = models.CharField(_("Last name"), max_length=30, )
    email = models.EmailField(_("Email"), blank=True, max_length=75)
    create_date = models.DateField(_("Creation date"))
    address = models.ForeignKey('AddressBook', blank=True, null=True, on_delete=models.SET_NULL)
    pipeline = models.ForeignKey(Pipeline, blank=True, null=True, on_delete=models.SET_NULL)

forms.py

class ContactModelForm(forms.ModelForm):
    def __init__(self, client, organization, *args, **kwargs):
        super(ContactModelForm, self).__init__(*args, **kwargs)
        self.helper = FormHelper()
        self.helper.layout = Layout(
            'first_name',
            'last_name',
            'title',
            'email',
            'address',
            'pipeline',
        )
        self.helper.form_class = 'form-horizontal'
        self.helper.form_method = 'post'
        self.helper.html5_required = True
        self.helper.add_input(Submit('contact_save', 'Save'))
        self.fields['address'].queryset = AddressBook.objects.filter(organization=client)
        self.fields['pipeline'].queryset = Pipeline.objects.filter(organization=organization)

    class Meta:
        model = ClientContact
        fields = ('first_name', 'last_name', 'title', 'email', 'address', 'pipeline')

Answer 1

我不确定为什么它不起作用，但我建议您将该功能移至模型保存方法。

class ClientContact(models.Model):
    title = models.CharField(_("Title"), max_length=50, blank=True, null=True)
    first_name = models.CharField(_("First name"), max_length=30, )
    last_name = models.CharField(_("Last name"), max_length=30, )
    email = models.EmailField(_("Email"), blank=True, max_length=75)
    create_date = models.DateField(_("Creation date"))
    address = models.ForeignKey('AddressBook', blank=True, null=True, on_delete=models.SET_NULL)
    pipeline = models.ForeignKey(Pipeline, blank=True, null=True, on_delete=models.SET_NULL)

    def save(self, *args, **kwargs):
        #check if obj is new or being updated
        try:
            obj = ClientContact.objects.get(pk=self.pk)
            if not obj.pipeline == self.pipeline:  # Field has changed
                self.pipeline_updated()
        except ObjectDoesNotExist:
            pass
        #call super and store data
        super(ClientContact, self).save(*args, **kwargs)