device assignment bug-assignment information-bug of organizations list for assignment

apps/pos_device/web/api/v1/serilaizers/device.py

@@ -1,5 +1,9 @@
+from apps.pos_device.web.api.v1.serilaizers import client as client_serializer
 from rest_framework.serializers import ModelSerializer
 from apps.pos_device import models as pos_models
+from rest_framework.exceptions import APIException
+from apps.pos_device import exceptions as pos_exceptions
+from rest_framework import status
 
 
 class ProviderCompanySerializer(ModelSerializer):
@@ -23,6 +27,10 @@ class DeviceSerializer(ModelSerializer):
             'province': instance.organization.province.id
         }
 
+        representation['assignment'] = DeviceAssignmentSerializer(
+            instance.assignment.all().first()
+        ).data
+
         return representation
 
 
@@ -43,6 +51,23 @@ class DeviceAssignmentSerializer(ModelSerializer):
         model = pos_models.DeviceAssignment
         fields = '__all__'
 
+    def validate(self, attrs):
+
+        device = attrs['device']
+        client = attrs['client']
+
+        if self.Meta.model.objects.filter(device=device, client=client).exists():
+            raise pos_exceptions.DeviceAlreadyAssigned()
+
+    def to_representation(self, instance):
+        representation = super().to_representation(instance)
+
+        representation['client'] = client_serializer.POSClientSerializer(
+            instance.client
+        ).data
+
+        return representation
+
 
 class StakeHoldersSerializer(ModelSerializer):
     class Meta: