create rancher incentive plan structure - add pos device main sheba

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

@@ -2,9 +2,10 @@ from rest_framework import serializers
 from apps.product import models as product_models
 from apps.authorization.api.v1 import serializers as authorize_serializers
 from apps.authentication.api.v1.serializers.serializer import OrganizationSerializer, OrganizationTypeSerializer
+from apps.product import exceptions
 
 
-class ProductCategorySerializer(serializers.ModelSerializer):
+class ProductCategorySerializer(serializers.ModelSerializer):  # noqa
     class Meta:
         model = product_models.ProductCategory
         fields = '__all__'
@@ -161,3 +162,20 @@ class IncentivePlanRancherSerializer(serializers.ModelSerializer):
     class Meta:
         model = product_models.IncentivePlanRancher
         fields = '__all__'
+
+    def validate(self, attrs):
+        """ validate incentive plans of a rancher """
+
+        rancher_plans_data = self.context['request'].data['data']
+
+        # check if rancher with same plan & livestock exists
+        if not self.instance:
+            for plan in rancher_plans_data:
+                if product_models.IncentivePlanRancher.objects.filter(
+                        plan_id=plan['plan'],
+                        rancher_id=plan['rancher'],
+                        livestock_type_id=plan['livestock_type'],
+                ).exists():
+                    raise exceptions.RancherIncentivePlanExists()
+
+        return attrs