Filter related objects Django - django

Question

Imagine such models in Django:
class Organisation(Model):
...
class Guest(Model):
organisation = ForeignKey(Guest, CASCADE, 'guests')
class Booking(Model):
guest = ForeignKey(Guest, CASCADE, 'bookings')
start_date = DateField()
end_date = DateField()
Using Django Rest Framework it is needed to perform a endpoint for
all organisations to be listed
all guests to be listed
bookings to be filtered agains start_date and listed
Sample of response:
"Organizations": [
{
...,
"Guests": [
{
...,
"Bookings": [
{...},
{...}
]
},
{
...,
"Bookings": [
]
}
]
},
{
...,
"Guests": [
{
...,
"Bookings": [
{...},
]
},
]
}
]
So, as you can see, I need all Organisations and Guests to be present, not only those who have Bookings.
What is the optimal way to perform that?
UPD:
Serializers used:
class BookingShortSerializer(serializers.ModelSerializer):
class Meta:
model = Booking
fields = (
'pk',
'start_date',
'guest',
)
class GuestBookingsSerializer(serializers.ModelSerializer):
bookings = BookingShortSerializer(many=True)
class Meta:
model = Guest
fields = (
'pk',
'name',
'bookings',
)
class OrganizationShortSerializer(serializers.ModelSerializer):
guests = GuestBookingsSerializer(many=True)
class Meta:
model = Organization
fields = (
'pk',
'public_name',
'internal_name',
'guests',
'order',
)
ViewSet used (no filtering now):
class OrganizationBookingsViewSet(mixins.ListModelMixin, GenericViewSet):
ordering = 'order'
serializer_class = OrganizationShortSerializer
permission_classes = (AllowAny,)
def get_queryset(self) -> QuerySet:
return Organization.objects.all()

Answer 1

Looks like this approach using SerializerMethodField solves the task. Should it be considered as a good solution, or not?
class GuestBookingsSerializer(serializers.ModelSerializer):
bookings = serializers.SerializerMethodField()
class Meta:
model = Guest
fields = (
'pk',
'name',
'bookings',
)
def get_bookings(self, guest):
date = self.context.['request'].query_params['start_date__gte']
bookings = guest.bookings.filter(start_date__gte=date).all()
serializer = BookingShortSerializer(bookings, many=True)
return serializer.data