DJango REST Framework 只读字段

Question

我有一个字段owner是一个ForeignKey以User模型。

该字段是required在创建时。但是以后就不能改了。

如何制作字段Non-Editable？除了创建多个序列化程序还有其他方法吗？

车库模型

class GarageDetails(models.Model):
    owner = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.PROTECT, )
    name = models.CharField(_('Garage Name'), max_length=254, blank=False, null=False, unique=True)
    price = models.IntegerField(_('Price'), blank=False)
    available_from = models.TimeField(_('Available From'), default=datetime.time(6, 00), blank=False)
    available_till = models.TimeField(_('Available till'), default=datetime.time(18, 00), blank=False)
    description = models.TextField(_('Garage Description'), blank=True, null=True)

    create_date = cmodels.UnixTimestampField(_('Date Added'), auto_now_add=True)
    update_date = cmodels.UnixTimestampField(_('Date Added'), auto_created=True)
    is_available = models.BooleanField(_('Available'), default=True)

序列化器

class UserFKSerializer(serializers.ModelSerializer):

    class Meta:
        model = get_user_model()
        fields = ('id', 'name', 'email', 'mobile')


class GarageSerializer(serializers.ModelSerializer):
    owner = UserFKSerializer(many=False, read_only=True)

    class Meta:
        model = GarageDetails
        fields = '__all__'
        read_only_fields = ('id', 'owner', 'create_date', 'update_date')

观看次数

class GarageRegister(generics.ListCreateAPIView):
    renderer_classes = (JSONRenderer, )
    permission_classes = (IsAuthenticated, )

    @csrf_exempt
    def post(self, request, *args, **kwargs):
        serialize = GarageSerializer(data=request.data)
        if serialize.is_valid():
            # Create Garage with owner & name

class GarageUpdate(generics.ListCreateAPIView):
    renderer_classes = (JSONRenderer, )
    permission_classes = (IsAuthenticated, )

    @csrf_exempt
    def post(self, request, *args, **kwargs):
        serialize = GarageSerializer(data=request.data)
        if serialize.is_valid():
            # Update Garage but can't update create_date, id, owner & name

Answer 1

您可以为每个用例（更新、创建）创建不同的模型序列化程序：

read_only_fields在您的模型序列化程序中指定该字段：

class MyModelSerializer(serializers.ModelSerializer):
    class Meta:
        model = MyModel
        fields = ('a', 'nother', 'field')
        read_only_fields = ('owner',)

对于 Django 表单，您可以设置disabled字段：

class MyModelForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):
       super().__init__(*args, **kwargs)
       form.fields['owner'].widget.attrs['disabled'] = True