django filter django-rest-framework arguments

How can I pass multiple values for a single parameter into the API url in Django Rest Framework?

I have made a filter API like this:

localhost/api/allpackages?price_min=700&price_max=900&destination=Spain&new_activity=Swimming&tour_type=Group%20Tour&featured=true&fix_departure=true

But according to new changes, I should be able to filter like this:

localhost/api/allpackages?destination=Spain&destination=Japan&destination=Thailand....featured=true...

There can be multiple values for a single parameter, because user can now click the checkboxes on the frontend. How can I achieve this?

My models:

class Package(models.Model):
    operator = models.ForeignKey(UserProfile, on_delete=models.CASCADE)
    destination = models.ForeignKey(Destination, on_delete=models.CASCADE)
    package_name = models.CharField(max_length=255)
    featured = models.BooleanField(default=False)
    price = models.IntegerField()
    duration = models.IntegerField(default=5)
    discount = models.CharField(max_length=255, default="15% OFF")
    discounted_price = models.IntegerField(default=230)
    savings = models.IntegerField(default=230)
    tour_type = models.CharField(max_length=100, choices=TOUR_TYPE, default='Group Tour')
    new_activity = models.ManyToManyField(NewActivity)
    accommodation = models.CharField(max_length=255,default='Guest House & Hotel')
    transport = models.CharField(max_length=150, default='Flight')
    age_range = models.CharField(max_length=100, default='6 to 79 years old')
    fix_departure = models.BooleanField(default=False)
....
...

My views:

class AllPackageAPIView(ListAPIView):
    queryset = Package.objects.all()
    serializer_class = PackageSerializer
    filterset_class = PackageFilter
    
 
    def get_queryset(self):
        new_activity = self.request.query_params.get('new_activity', None)
        destination = self.request.query_params.get('destination', None)
        if new_activity is not None:
            if destination is not None:
                return Package.objects.filter(destination__name=destination, new_activity__title=new_activity)
            else:
                return Package.objects.filter(new_activity__title=new_activity)
        elif destination is not None:
            if new_activity is not None:
                return Package.objects.filter(destination__name=destination, new_activity__title=new_activity)
            else:
                return Package.objects.filter(destination__name=destination)
        else:
            return Package.objects.all()

My filter:

class PackageFilter(filters.FilterSet):
   price = filters.RangeFilter()

   class Meta:
      model = Package
      fields = ['price','featured', 'fix_departure',
                'tour_type',]

My serializers:

class PackageSerializer(serializers.ModelSerializer):
  
    class Meta:
        model = Package
        fields = ['id', 'operator','destination', 'package_name', 'duration', 'featured', 'price', 'discount', 'discounted_price',
                       'tour_type','new_activity', 'accommodation', 'transport', 'age_range',
                  'savings', 'fix_departure', 'rating', 'image', 'date_created', ]
        # fields = '__all__'
        depth = 1

I have done this but now no data are shown. The get list is empty. I used get_queryset(self) as a function and now self.request.GET.get for querying.

My updated view:

class AllPackageAPIView(ListAPIView):
    queryset = Package.objects.all()
    serializer_class = PackageSerializer
    filterset_class = PackageFilter

def get_queryset(self): 
    new_activity = self.request.GET.get('new_activity', None)
    destination = self.request.GET.get("destination", "")
    destination_values = destination.split(",")
    if new_activity is not None:
        if destination is not None:
            return Package.objects.filter(destination__name=destination_values, new_activity__title=new_activity)
        else:
            return Package.objects.filter(new_activity__title=new_activity)
    elif destination is not None:
        if new_activity is not None:
            return Package.objects.filter(destination__name=destination_values, new_activity__title=new_activity)
        else:
            return Package.objects.filter(destination__name=destination_values)
    else:
        return Package.objects.all()

My solution:

def get_queryset(self):
# def get(self, request, format=None, *args, **kwargs):

    new_activity = self.request.GET.get('new_activity',None)
    destination = self.request.GET.get("destination",None)
    tour_type = self.request.GET.get("tour_type",None)
    if new_activity is not None:
        new_activity = self.request.GET.get('new_activity', "")
        new_activity_values = new_activity.split(",")
        if destination is not None:
            destination = self.request.GET.get("destination", "")
            destination_values = destination.split(",")
            if tour_type is not None:
                tour_type = self.request.GET.get("tour_type", "")
                tour_type_values = tour_type.split(",")
                return Package.objects.filter(destination__name__in=destination_values,new_activity__title__in=new_activity_values,
                                          tour_type__in=tour_type_values)
            else:
                return Package.objects.filter(destination__name__in=destination_values,
                                              new_activity__title__in=new_activity_values)
        else:
            return Package.objects.filter(new_activity__title__in=new_activity_values)
    elif destination is not None:
        destination = self.request.GET.get("destination", "")
        destination_values = destination.split(",")
        if new_activity is not None:
            new_activity = self.request.GET.get('new_activity', "")
            new_activity_values = new_activity.split(",")
            if tour_type is not None:
                tour_type = self.request.GET.get("tour_type", "")
                tour_type_values = tour_type.split(",")
                return Package.objects.filter(destination__name__in=destination_values,
                                              new_activity__title__in=new_activity_values,
                                              tour_type__in=tour_type_values)
            else:
                return Package.objects.filter(destination__name__in=destination_values,
                                              new_activity__title__in=new_activity_values
                                              )
        else:
            return Package.objects.filter(destination__name__in=destination_values)
    elif tour_type is not None:
        tour_type = self.request.GET.get("tour_type", "")
        tour_type_values = tour_type.split(",")
        if destination is not None:
            destination = self.request.GET.get("destination", "")
            destination_values = destination.split(",")
            if new_activity is not None:
                new_activity = self.request.GET.get('new_activity', "")
                new_activity_values = new_activity.split(",")
                return Package.objects.filter(destination__name__in=destination_values,
                                              new_activity__title__in=new_activity_values,
                                              tour_type__in=tour_type_values)
            else:
                return Package.objects.filter(destination__name__in=destination_values,
                                                       tour_type__in=tour_type_values)
        else:
            return Package.objects.filter(tour_type__in=tour_type_values)
    else:
        return Package.objects.all()

This works as a filter for checkbox searches in ecommerce website, but it has a problem. When calling API, it repeats some of the objects i.e. same package object in my case. If anyone can solve it, let me know.

Solution

I have solved this question before, I've decided to get multiple values in URL by using split , character.

Example: URL: localhost/api/allpackages?destination=Spain,Japan,Thailand....featured=true...

destination = self.request.GET.get("destination", "")

destination_values = destination.split(",")

Sample code about filtering first_name, last_name, and multiple values of username in User model.

model.py

class User(AbstractUser):
    @property
    def full_name(self):
        """Custom full name method as a property"""
        return str(self.first_name) + ' ' + str(self.last_name)

    def __str__(self):
        return self.email

view.py

class UserFilter(filters.FilterSet):
    class Meta:
        model = User
        fields = ['first_name', 'last_name']


class ListCreateUser(ListCreateAPIView):
    """
    List and Create User Generic contains create and list user APIs.
    """
    serializer_class = UserSerializer
    queryset = User.objects.all()
    filter_backends = (filters.DjangoFilterBackend,)
    filterset_class = UserFilter

    def get_queryset(self):
        username = self.request.GET.get('username', '')

        if username:
            username_values = username.split(',')
            return User.objects.filter(username__in=username_values)

        return User.objects.all()

Results:

Filter by username