accounts: role create and list apis add

core/apps/accounts/serializers/role/create.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 CreateRoleSerializer(serializers.Serializer):
+    name = serializers.CharField()
+    comment = serializers.CharField(required=False)
+
+    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 create(self, validated_data):
+        with transaction.atomic():
+            return Role.objects.create(
+                name=validated_data.get('name'),
+                comment=validated_data.get('comment'),
+            )