How to filter Django serializer data? - python-3.x

Question

I'm trying to filter data based on userName in JWT. This is how I've been trying to do it:
views.py:
class TestView(APIView):
permission_classes = (IsAuthenticated,)
def get(self, request):
token = request.META.get('HTTP_AUTHORIZATION', " ").split(' ')[1]
data = {'token': token}
try:
valid_data = VerifyJSONWebTokenSerializer().validate(data)
user = valid_data['user']
request.user = user
person = Person.objects.filter(userName=request.user)
except ValidationError as v:
print("validation error", v)
return Response(person[0])
This works as I can get the Person data with print("Person: ", person[0]). The return Response(person[0]) however returns an error: TypeError: Object of type Person is not JSON serializable. I guess I could use a serializer class to return a valid JSON, am I right? I have this in my serializers.py:
class TestSerializer(serializers.ModelSerializer):
class Meta:
model = Person
fields = '__all__'
I just don't know how to use this with my view. If I use serializer instead of person = Person.objects.filter(userName=request.user), how is the filtering supposed to be done?
Please correct me if I'm not on right track at all.

Answer 1

You can add serializer to view, provide query result to serializer and get serialized data:
class TestView(APIView):
permission_classes = (IsAuthenticated,)
serializer_class = TestSerializer # add serializer
def get(self, request):
token = request.META.get('HTTP_AUTHORIZATION', " ").split(' ')[1]
data = {'token': token}
try:
valid_data = VerifyJSONWebTokenSerializer().validate(data)
user = valid_data['user']
request.user = user
person = Person.objects.filter(userName=request.user).last()
data = self.serializer_class(instance=person).data # serialize query result
except ValidationError as v:
print("validation error", v)
raise v
return Response(data) # return serialized response
Here you can find some examples of using serializer with class based views.
Also note that your Person model might have security-sensitive fields like password, etc, so it's better to specify exact fields you need in serializer rather then use fields = '__all__'.

Answer 2

Are you using Django-Rest-Framework (based on your use of ModelSerializer)?
In pure Django, from the documentation on serializers, you can do something like:
from django.core import serializers
json_response = serializers.serialize("json", person[0])
return Response(json_response)
If you are using Django-Rest-Framework:
return Response(TestSerializer(person[0]).data)