1.ModelForm.save()

｀ModelForm.save(commit=False)｀可以先不保存到数据库，返回一个数据库对象，之后再用数据库对象save()。commit默认是True,也就是默认直接保存了。
｀｀｀
if comment_form.is_valid():

new_comment = comment_form.save(commit=False)
new_comment.post = post
new_comment.save()

｀｀｀

另外，如果ModelForm的模型有ManyToMany的关系，需要在最后需要调用save_m2m()

# Create a form instance with POST data.
>>> f = AuthorForm(request.POST)
Create,but don't save the new author instance.



new_author = f.save(commit=False)



Modify the author in some way.



new_author.some_field = 'some_value'



Save the new instance.



new_author.save()



Now,save the many-to-many data for the form.



f.save_m2m()