Set explicit PK when creating a new Request

backend/request/admin.py

@@ -1,3 +1,4 @@
+from typing import Any
 from common.admin import ArchivedFilter
 from django.contrib import admin
 from django_admin_listfilter_dropdown.filters import RelatedDropdownFilter
@@ -53,6 +54,18 @@ class RequestAdmin(admin.ModelAdmin):
         "mark_as_non_archived",
     )
 
+    def save_model(self, request, obj, form, change):
+
+        # Set explicit PK when creating a new Request, do not rely on the
+        # DB autoincrement value because it does not know what the last
+        # actual Request ID in the DB is
+        # NZ, disable/amend this if you need to use an ID other than the
+        # next integer after the largest Request ID in the DB
+        if obj.pk == None and Request.objects.exists():
+            obj.id = Request.objects.order_by('-id').first().id + 1
+
+        return super().save_model(request, obj, form, change)
+
     @admin.action(description="Mark as archived")
     def mark_as_archived(self, request, queryset):
         queryset.update(archived=True)

backend/request/serializers.py

@@ -180,8 +180,16 @@ def rename_files(self, instance):
 
     def create(self, validated_data):
 
+        # Set explicit PK when creating a new Request, do not rely on the
+        # DB autoincrement value because it does not know what the last
+        # actual Request ID in the DB is
+        # NZ, disable/amend this if you need to use an ID other than the
+        # next integer after the largest Request ID in the DB
+        if Request.objects.exists():
+            validated_data.update({'pk': Request.objects.order_by('-id').first().id + 1})
+
         instance = super().create(validated_data)
-        
+
         self.rename_files(instance)
 
         return instance