How to GET multipule ModelSrializer in one APIVIEW using Django Rest Framework

Question

I have UserModel each user has multiple package and each package have price and program. model.py:

class User(models.Model):
    name= models.CharField(max_length=100)
class Package(models.Model):
    package_name = models.CharField(max_length=100)
    user= models.ForeignKey(User, on_delete=models.CASCADE,related_name='user_package')
class Program(models.Model):
    title = models.CharField(max_length=100)
    user_package = models.ForeignKey(Package, on_delete=models.CASCADE)
class Price(models.Model):
    price = models.FloatField()
    user_package = models.ForeignKey(Package, on_delete=models.CASCADE)

serializer look like:

class UserSerializer(NestedCreateMixin, NestedUpdateMixin,serializers.ModelSerializer):
    program = ProgramSerializer(source='user_program', many=True, read_only=True)
    package = PackageSerializer(source='user_package', many=True, read_only=True)
    price = PriceSerializer(source='price', many=True, read_only=True)
    class Meta:
        model = User
        fields= ("__all__")

views.py:

class user_apiView(APIView):
    def get(self, request):
        user= user.objects.all()
        serializer = UserSerializer(user, many = True)
        return Response(serializer.data)

and that what I get:

{
        "id": 1,
        "package": [
            {
                "id": 1,
                "package_name": "wfe",
                "user": 1
            },
            {
                "id": 2,
                "package_name": "wfe",
                "user": 1
            }
        ]
}

how can GET this RESULT?

{
            "id": 1,
            "package": [
                {
                    "id": 1,
                    "package_name": "wfe",
                    "user": 1
                },
                {
                    "id": 2,
                    "package_name": "wfe",
                    "user": 1
                }
              ],
             "price": [
                {
                    "id": 1,
                    "price": "wfe",
                    "package": 1
                },
                {
                    "id": 2,
                    "price": "wfe",
                    "package": 2
                }
              ]
              "program": [
                {
                    "id": 1,
                    "title": "wfe",
                    "package": 1
                },
                {
                    "id": 2,
                    "title": "wfe",
                    "package": 2
                }
              ]
    }