On Fri, Jan 25, 2013 at 10:36 PM, Tundebabzy <tundeba...@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 %-) -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. Visit this group at http://groups.google.com/group/django-users?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
