From 7cd3f992aedcbef7cd278ec9b003d104edd01a6b Mon Sep 17 00:00:00 2001
From: Mojtaba-z <mojtaba.zolfaghari30@gmail.com>
Date: Sun, 8 Jun 2025 14:58:19 +0330
Subject: [PATCH] control one permission with same name for each page

---
 apps/authorization/api/v1/api.py               | 11 +++++++++++
 .../migrations/0017_alter_permissions_name.py  | 18 ++++++++++++++++++
 apps/authorization/models.py                   |  2 +-
 apps/core/exceptions.py                        |  9 +++++++++
 4 files changed, 39 insertions(+), 1 deletion(-)
 create mode 100644 apps/authorization/migrations/0017_alter_permissions_name.py

diff --git a/apps/authorization/api/v1/api.py b/apps/authorization/api/v1/api.py
index 225a1f1..6a125e1 100644
--- a/apps/authorization/api/v1/api.py
+++ b/apps/authorization/api/v1/api.py
@@ -1,5 +1,6 @@
 from rest_framework_simplejwt.authentication import JWTAuthentication
 from rest_framework.permissions import AllowAny, IsAuthenticated
+from apps.core.exceptions import ConflictException
 from rest_framework.exceptions import APIException
 from apps.authorization.api.v1.serializers import (
     RoleSerializer,
@@ -64,6 +65,16 @@ class PermissionViewSet(viewsets.ModelViewSet):
     filter_backends = [filters.SearchFilter]
     search_fields = ['page__name', ]
 
+    def create(self, request, *args, **kwargs):
+        if self.queryset.filter(name=request.data['name'], page_id=request.data['page']).exists():
+            raise ConflictException('a permission with this page exists.')
+        serializer = self.serializer_class(data=request.data)
+        if serializer.is_valid():
+            serializer.save()
+            return Response(serializer.data, status=status.HTTP_200_OK)
+        else:
+            return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
+
 
 class UserRelationViewSet(viewsets.ModelViewSet):
     """ Crud Operations for User Relations """
diff --git a/apps/authorization/migrations/0017_alter_permissions_name.py b/apps/authorization/migrations/0017_alter_permissions_name.py
new file mode 100644
index 0000000..e32fbb1
--- /dev/null
+++ b/apps/authorization/migrations/0017_alter_permissions_name.py
@@ -0,0 +1,18 @@
+# Generated by Django 5.0 on 2025-06-08 11:10
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('authorization', '0016_alter_permissions_name'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='permissions',
+            name='name',
+            field=models.CharField(max_length=50),
+        ),
+    ]
diff --git a/apps/authorization/models.py b/apps/authorization/models.py
index 229d2df..385af2d 100644
--- a/apps/authorization/models.py
+++ b/apps/authorization/models.py
@@ -21,7 +21,7 @@ class Page(BaseModel):
 class Permissions(BaseModel):
     """ permission level of users """
 
-    name = models.CharField(max_length=50, unique=True)
+    name = models.CharField(max_length=50)
     description = models.TextField(max_length=500)
     category_choices = (
         ('api', 'Api'),
diff --git a/apps/core/exceptions.py b/apps/core/exceptions.py
index 5262288..b57a86a 100644
--- a/apps/core/exceptions.py
+++ b/apps/core/exceptions.py
@@ -4,3 +4,12 @@
     you can check out the Django Rest Framework documentation at:
     https://www.django-rest-framework.org/api-guide/exceptions/#custom-exception-handling
 """
+
+from rest_framework.exceptions import APIException
+from rest_framework import status
+
+
+class ConflictException(APIException):
+    status_code = status.HTTP_409_CONFLICT
+    default_detail = "Object already exists."
+    default_code = "conflict"