accounts: role create and list apis add

core/apps/accounts/serializers/role/update.py

@@ -0,0 +1,26 @@
+# django
+from django.db import transaction
+
+# rest framework
+from rest_framework import serializers
+
+
+# accounts
+from core.apps.accounts.models import Role
+
+
+class UpdateRoleSerializer(serializers.Serializer):
+    name = serializers.CharField()
+    comment = serializers.CharField()
+
+    def validate(self, data):
+        if Role.objects.filter(name=data['name']).exists():
+            raise serializers.ValidationError({"name": "Role with this name already exists"})
+        return data
+    
+    def update(self, instance, validated_data):
+        with transaction.atomic():
+            instance.name = validated_data.get('name', instance.name)
+            instance.comment = validated_data.get('comment', instance.comment)
+            instance.save()
+            return instance