Re: Please explain this django admin code

excellent explanation did not know anything about it

thank Russ :)

On Fri, Jan 25, 2013 at 9:08 AM, Russell Keith-Magee <russell@keith-magee.com> wrote:

On Fri, Jan 25, 2013 at 10:36 PM, Tundebabzy <tundebabzy@gmail.com> wrote:

I'll be really grateful if someone can take the time to explain these lines of code. Its from contrib.admin.options

        def wrap(view):
            def wrapper(*args, **kwargs):
                return self.admin_site.admin_view(view)(*args, **kwargs)    # This is the brain twisting line
            return update_wrapper(wrapper, view)

The syntax foo.bar()(*osama **obama) is just blowing fuses in my brain and then from the code above, I can't even find where admin_view is defined.

Admin is really composed of two types of object -- an Admin Site object, and a collection of ModelAdmin objects. The AdminSite object governs the access to the admin site; a ModelAdmin object exists for each model registered with the admin. As a result of that relationship, every ModelAdmin object also knows the site that it is a part of.

So - if you're in contrib.admin.options, you're looking at the code for the ModelAdmin object. self.admin_site refers to the site that the ModelAdmin instance belongs to; the admin_view method belongs to that site object. It's essentially a decorator providing the permissions check for the current user.

A decorator is just a function that takes a function as an argument, and returns a function as a result. Since it returns a function, the return value can itself be invoked. 

So:

self.admin_site

is the admin site.

self.admin_site.admin_view 

is a decorator method.

self.admin_site.admin_view(my_view)

is the application of the decorator applied to a specific view

self.admin_site.admin_view(my_view)(*args, **kwargs)

is the invocation of the decoration result using the given args and kwargs.

Yours,

Russ Magee %-)

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