Overriding Django views with decorators

问题

I have a situation that requires redirecting users who are already logged in away from the login page to another page. I have seen mention that this can be accomplished with decorators which makes sense, but I am fairly new to using them. However, I am using the django login and a third party view (from django-registration). I do not want to change any of the code in django.contrib.auth or django-registration. How can I apply a decorator to a view that is not to be modified in order to get the desired behavior.

Thanks in advance!

UPDATE: I discovered that I mistakenly associated the login function with the registration module. django-registration has nothing to do with this issue. However, I still need to be able to override default login() behavior. Any thoughts?

回答1:

Three more ways to do it, though you'll need to use your own urlconf for these:

Add the decorator to the view directly in the urlconf:
```
...
(regexp, decorator(view)),
...
```
You need to import the view and the decorator into the urlconf though, which is why I don't like this one. I prefer to have as few imports in my urls.py's as possible.
Import the view into an <app>/views.py and add the decorator there:
```
import view

view = decorator(view)
```
Pretty much like Vinay's method though more explicit since you need an urlconf for it.
Wrap the view in a new view:
```
import view

@decorator
def wrapperview(request, *args, **kwargs):
    ... other stuff ...
    return view(request, *args, **kwargs)
```
The last one is very handy when you need to change generic views. This is what I often end up doing anyway.

Whenever you use an urlconf, order of patterns matter, so you might need to shuffle around on which pattern gets called first.

回答2:

If you have the decorator function and you know which view in django-registration you want to decorate, you could just do

registration.view_func = decorator_func(registration.view_func)

where registration is the module in django-registration which contains the view function you want to decorate, view_func is the view function you want to decorate, and decorator_func is the decorator.

来源：https://stackoverflow.com/questions/1649351/overriding-django-views-with-decorators

标签

python

django

django-views