[django]复制/克隆一条查询结果

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 = Blog(name='My blog', tagline='Blogging is easy')
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:

class ThemeBlog(Blog):
    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：

entry = Entry.objects.all()[0] # some previous entry
old_authors = entry.authors.all()
entry.pk = None
entry.save()
entry.authors = old_authors # saves new many2many relations

参考

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