Django-rest-framework serializer various fields in multiple views

Question

I am new to Django and have not found a solution for my problem.

The problem is to force a special serializer to include different numbers of fields when using different types. I would like to use the "id" field in my first view, and in the second - the "id" and "name" fields.

Here is my model.py

class Processing(models.Model):
    id = models.AutoField(primary_key=True)
    name = models.CharField()
    description = models.CharField()

And here is my serializer.py

class ProcessingSerializer(serializers.ModelSerializer):
    id = serializers.ModelField(model_field=Processing()._meta.get_field('id'))
    class Meta:
        model = Processing
        fields = ('id', 'name')

Any help would be appreciated.

Answer 1

- DRF, Serializer . , .

, mutiple serializers . get_serializer_class. , , , .

def get_serializer_class(self):
    if self.request.user.is_staff:
        return FullAccountSerializer
    return BasicAccountSerializer

, - . - :

def get_serializer_class(self):
    if self.action == 'retrieve':
        return serializers.PlayerDetailSerializer
    else : 
        return serializers.PlayerSerializer

.

Answer 2

class DynamicFieldsModelSerializer(ModelSerializer):
    """
    A ModelSerializer that takes an additional `fields` and 'exclude' argument that
    controls which fields should be displayed.
    """

    def __init__(self, *args, **kwargs):
        # Don't pass the 'fields' arg up to the superclass
        fields = kwargs.pop('fields', None)
        exclude = kwargs.pop('exclude', None)

        # Instantiate the superclass normally
        super(DynamicFieldsModelSerializer, self).__init__(*args, **kwargs)

        if fields is not None:
            # Drop any fields that are not specified in the `fields` argument.
            allowed = set(fields)
            existing = set(self.fields.keys())
            for field_name in existing - allowed:
                self.fields.pop(field_name)

        if exclude is not None:
            not_allowed = set(exclude)
            for exclude_name in not_allowed:
                self.fields.pop(exclude_name)



class UserCreateSerializer(DynamicFieldsModelSerializer):
    class Meta:
        model = User
        fields = ('username', 'tel', 'email', 'password')

:

serializer = UserCreateSerializer(data=request.data, fields=('username', 'password', 'tel'))

serializer = UserCreateSerializer(data=request.data, fields=('username', 'password', 'email'))

Answer 3

:

class SelectSerializerMixin(object):
    serializer_class = None
    list_serializer_class = None
    retrieve_serializer_class = None
    update_serializer_class = None
    partial_update_serializer_class = None
    create_serializer_class = None

    def get_serializer_class(self):
        """
        Return the class to use for the serializer.
        Defaults to using 'self.serializer_class'.
        """
        assert self.serializer_class is not None, (
            "'%s' should either include a 'serializer_class' attribute, "
            "or override the 'get_serializer_class()' method."
            % self.__class__.__name__
        )
        return getattr(self, f"{self.action}_serializer_class") or self.serializer_class

Then add this mixin to your ViewSet:

class MyModelViewSet(SelectSerializerMixin, ModelViewSet):
    queryset = models.MyModel.objects.all()
    serializer_class = serializers.SomeSerializer
    retrieve_serializer_class = serializers.AnotherSerializer
    list_serializer_class = serializers.OneMoreSerializer

But if you need a Serializer with a dynamic set of fields (for example, you have a handler, but you need to return only certain fields in the response), you can use the approach from Ykh's answer.

fooobar.com/questions/1677517 / ...

Answer 4

From what I know

You cannot do this. If you need different fields for different types, you will need to write different serializers.