rancher check unique - pos free products check unique - 500 error handling

apps/product/pos/api/v1/serializers/product_serializers.py

@@ -1,8 +1,8 @@
 from rest_framework import serializers
 from apps.product import models as product_models
 from apps.pos_device.models import POSFreeProducts
-from apps.authorization.api.v1 import serializers as authorize_serializers
-from apps.authentication.api.v1.serializers.serializer import OrganizationSerializer, OrganizationTypeSerializer
+from apps.authentication.api.v1.serializers.serializer import OrganizationTypeSerializer
+from apps.product.exceptions import FreePOSProductUniqueCheck
 
 
 class POSFreeProductSerializer(serializers.ModelSerializer):
@@ -10,6 +10,18 @@ class POSFreeProductSerializer(serializers.ModelSerializer):
         model = POSFreeProducts
         fields = '__all__'
 
+    def validate(self, attrs):
+        """
+        @check free product for pos to be unique
+        """
+        organization = attrs['organization']
+        product = attrs['product']
+
+        if self.Meta.model.objects.filter(organization=organization, product=product).exists():
+            raise FreePOSProductUniqueCheck()
+
+        return attrs
+
     def to_representation(self, instance):
         representation = super().to_representation(instance)