How to send data back to Android app from django rest framework using asynchttp?

Question

Model.py

 class Server(models.Model):
 label = models.TextField(max_length=200,null=True)  #compare this
 upload1 = models.FileField(null=True, blank=True)
 Image1 = models.TextField(upload1, null=True)

 class Android(models.Model):
 label=models.TextField(max_length=200,null=True) #with this
 imagestring=models.TextField(null=True,blank=True)
 returnlabel=models.TextField(null=True,blank=True)

So in my serializer class i am comparing labels from Android model and server model in (def get_returnlabel),and i want to return this label back to my android app.Any suggestons on how to do it.On my android app I am using async http.

Serializer.py

   class FoodSerializers(serializers.HyperlinkedModelSerializer):
   class Meta:
   model=Server
   fields=('url','label','Image1','upload1')

 class AndroidSerializers(serializers.ModelSerializer):

    class Meta:
    model = Android
    fields = ('label', 'imagestring', 'returnlabel') (<--returnlabel back to android app)

 #Compare label from Server and Android

 def get_return_label(self, obj):
       queryset = Server.objects.filter( labelServer=obj.label)
       queryset_serializer = FoodSerializers( queryset, many=True, read_only=True)      
       return queryset_serializer.data

Views.py

  class FoodViewSet(viewsets.ModelViewSet):
            queryset = Server.objects.all()
            serializer_class =FoodSerializers

  class Androids(viewsets.ModelViewSet):
        queryset =Android.objects.all()
        serializer_class = AndroidSerializers

In get_return_label(self, obj) where would obj come from? Would this be looked up from the incoming request? — Will Keeling
– Will Keeling, Commented Dec 1, 2018 at 10:43
Get_return_label line 2 .labelserver=obj.label so yes..please help me out here really desperatr — Muhammed Mesum
– Muhammed Mesum, Commented Dec 1, 2018 at 11:48
Ok so to clarify, you're essentially wanting to expose get_return_label() so that your Android application can retrieve the data from it remotely? — Will Keeling
– Will Keeling, Commented Dec 1, 2018 at 12:51
I'll try. So when your Android app makes a request to get_return_label(), what parameters will it send? Perhaps you could post that code if you have written it. — Will Keeling
– Will Keeling, Commented Dec 1, 2018 at 14:16

Will Keeling · Accepted Answer · 2018-12-02 18:12:04Z

0

Assuming I've understood your question correctly, and that you're basically asking how you would return the output from get_return_label() back to your Android client, then you should just be able to create an extra action in your viewset for that. You'd need to relocate get_return_label() to the viewset first.

For example:

from rest_framework.response import Response

class FoodViewSet(viewsets.ModelViewSet):
    queryset = Server.objects.all()
    serializer_class = FoodSerializers

    @action(detail=False, methods=['post'])
    def get_return_label(self, request):
        obj = request.data  # The RecognizingFood object posted by the client

        queryset = Server.objects.filter(label=obj['label'])
        queryset_serializer = FoodSerializers(queryset, many=True, read_only=True)      
        return Response(queryset_serializer.data)

To access it, you'd use the existing URL of FoodViewSet appended with /get_return_label/

The alternative is to create a dedicated view end point:

from rest_framework import views

class GetReturnLabelView(views.APIView):

    def post(self, request):
        obj = request.data  # The RecognizingFood object posted by the client

        queryset = Server.objects.filter(label=obj['label'])
        queryset_serializer = FoodSerializers(queryset, many=True, read_only=True)      
        return Response(queryset_serializer.data)

    def get(self, request):
        queryset = Server.objects.filter(label=request.data['label'])
        queryset_serializer = FoodSerializers(queryset, many=True, read_only=True)      
        return Response(queryset_serializer.data)

And map that in your urls.py:

path(r'get_return_label', views.GetReturnLabelView.as_view())

edited Dec 2, 2018 at 18:12

answered Dec 1, 2018 at 16:46

Will Keeling

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10 Comments

Muhammed Mesum Over a year ago

Thanks but what changes would i need to make on my android code to see wether i am getting the values back

Will Keeling Over a year ago

Both approaches assume your android client is making a POST request (from what I could establish from looking at your code). If you want to make a GET request, you'll need to update the methods list in approach 1, and add a get() function in approach 2. Your existing LOG statements in the onSuccess() callback should print out the values of the response you get back. Just make sure that your logging system is switched to log at the correct level (e.g. DEBUG) so that you actually see these messages.

Muhammed Mesum Over a year ago

but what do i put in get method?

Muhammed Mesum Over a year ago

can u help me here as well..so sorry

Will Keeling Over a year ago

On mobile now but will look again later.

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