您的任务需要相当hacky的代码，这些代码很难维护和理解（如果可能的话）。

You task requires rather hacky code which will be very hard to maintain and understand (if it's even possible).

这怎么办？

class EntryManager(models.Manager):
    def by_user(self, user):
        # do anything you want

# usage
Entry.objects.by_user(user=user)