code: def make_mine(self, request, queryset):
          
          author = Author.objects.get(pk=request.user.pk)
          for entry in queryset:
              if author not in entry.authors.all():
                  entry.authors.add(author)
          self.message_user(
              request, _('The selected entries now belong to you.'))
docs: Set the entries to the current user.