本文转载自：http://mozillazg.com/2013/02/django-copy-or-clone-a-query-result-and-insert-it-into-database.html
复制/克隆一条查询结果，并将它插入到数据库中：
将 pk 值设为 None 即可：
blog.save() # post.pk == 1 blog.pk = None blog.save() # post.pk == 2
如果该 model 继承于另一个 model 的话，必须将 pk 和 id 的值都设为 None:
theme = models.CharField(max_length=200) django_blog = ThemeBlog(name='Django', tagline='Django is easy', theme='python') django_blog.save() # django_blog.pk == 3 django_blog.pk = None django_blog.id = None django_blog.save() # django_blog.pk == 4
需要注意都是：这种方法不会复制相关对象。如果想复制相关（类似多对对的）对象的话，需要先将相关对象取出来然后在保存到新的对象中。例如，Entry 与 Author 是多对多关系：
old_authors = entry.authors.all() entry.pk = None entry.save() entry.authors = old_authors # saves new many2many relations
参考：
python - How do I clone a Django model instance object and save it to the database? - Stack Overflow
