import - service area in organization & validate in org rancher link

apps/herd/web/api/v1/serializers.py

@@ -5,7 +5,7 @@ from apps.authentication.api.v1.serializers.serializer import (
     ProvinceSerializer,
     CitySerializer
 )
-from apps.herd.exception import HerdCapacityException
+from apps.herd.exception import HerdCapacityException, HerdException
 from apps.herd.models import Herd, Rancher, RancherOrganizationLink
 
 
@@ -70,6 +70,19 @@ class RancherOrganizationLinkSerializer(serializers.ModelSerializer):
         model = RancherOrganizationLink
         fields = '__all__'
 
+    def validate(self, attrs):
+        rancher = attrs['rancher']
+        organization = attrs['organization']
+
+        if self.Meta.model.objects.filter(rancher=rancher, organization=organization).exists():
+            raise HerdException(message="دامدار برای تعاونی مد نظر از قبل وجود دارد", status_code=403)  # noqa
+
+        if self.instance:
+            if rancher.city not in organization.service_area:
+                raise HerdException(message="دامدار در محدوده فعالیت تعاونی قرار ندارد", status_code=403)  # noqa
+
+        return attrs
+
     def to_representation(self, instance):
         representation = super().to_representation(instance)