[uncloud_pay] add "prototype"

uncloud/uncloud_pay/views.py

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+from django.shortcuts import render
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+# Create your views here.
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+# to be implemented
+class BalanceViewSet(viewsets.ModelViewSet):
+    # here we return a number
+    # number = sum(payments) - sum(bills)
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+    bills = Bills.objects.filter(owner=self.request.user)
+    payments = Payment.objects.filter(owner=self.request.user)
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+    # sum_paid = sum([ amount for amount payments..,.  ]) # you get the picture
+    # sum_to_be_paid = sum([ amount for amount bills..,.  ]) # you get the picture
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+class Bills(viewset.ModelViewSet):
+    def unpaid(self, request):
+        return Bills.objects.filter(owner=self.request.user, paid=False)
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+    serializer_class = BillSerializer
+    permission_classes = [permissions.IsAuthenticated]
+    http_method_names = ['get']
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+    def get_queryset(self):
+        return self.request.user.get_bills()