By default, is transaction used in Django Admin Actions?

Question

I know that by default, transaction is used in Django Admin when adding, changing and deleting data according to my tests.

But, I selected Delete selected persons and clicked on Go in Django Admin Actions. *I use PostgreSQL:

Then, clicked on Yes, I'm sure to delete data:

Now, only one query DELETE is run without including one or more other queries between BEGIN and COMMIT as shown below so I doubt that by default, transaction is used in Django Admin Actions. *These below are the PostgreSQL query logs and you can check how to log PostgreSQL queries :

So by default, is transaction used in Django Admin Actions?

Answer 1

No, by default, transaction is not used in Django Admin Actions.

First, you can see @transaction.atomic or with transaction.atomic(): is not used for the default delete_queryset() below:

class ModelAdmin(BaseModelAdmin):
    
    # ...

    def delete_queryset(self, request, queryset):
        """Given a queryset, delete it from the database."""
        queryset.delete()

    # ...

Second, if you add select_for_update() code to delete_queryset() by overriding it as shown below:

@admin.register(Person)
class PersonAdmin(admin.ModelAdmin):

    def delete_queryset(self, request, queryset):
        print(queryset.select_for_update()) # Here
        queryset.delete()

Then, select Delete selected persons and click on Go in Django Admin Actions:

Then, click on Yes, I'm sure to delete data:

You will get the error below because select_for_update() needs to be used with transaction so which means by default, transaction is not used in Django Admin Actions:

django.db.transaction.TransactionManagementError: select_for_update cannot be used outside of a transaction.