change order list serialzier class

core/apps/shared/admin/usd_course.py

@@ -0,0 +1,23 @@
+from django.contrib import admin
+from django.http import HttpResponseRedirect
+from django.urls import reverse 
+
+from core.apps.shared.models import UsdCourse
+
+
+@admin.register(UsdCourse)
+class UsdCourseAdmin(admin.ModelAdmin):
+    def has_add_permission(self, request):
+        return not UsdCourse.objects.exists()
+    
+    def has_delete_permission(self, request, obj = ...):
+        return False
+
+    def changelist_view(self, request, extra_context=None):
+        config, created = UsdCourse.objects.get_or_create(
+            defaults=dict(
+                value=0
+            )
+        )
+        url = reverse("admin:shared_usdcourse_change", args=[config.id])
+        return HttpResponseRedirect(url)