cache_page decorator documented incorrectly

[Chris Beaven]

While investigating #2564, I found that the problem was actually incorrect use of the cache_page decorator, but the documentation recommends this incorrect format.

The ​current documentation says

It’s easy to use:

from django.views.decorators.cache import cache_page

def slashdot_this(request):
    ...

slashdot_this = cache_page(slashdot_this, 60 * 15)

Or, using Python 2.4’s decorator syntax:

@cache_page(60 * 15)
def slashdot_this(request):
    ...

The Python 2.4 syntax can not be used in this case.

@cache_page(60 * 15) is actually equivalent slashdot_this = cache_page(60 * 15)(slashdot_this) which is obviously incorrect (the cache_page decorator expects the both the function and any arguments to be passed directly to it)

The decorator (which is actually from django.utils.decorators.decorator_from_middleware) is the problem here and perhaps it's format should change - but for now, let's just fix the documentation.

[Malcolm Tredinnick]

This is a problem with the decorator, not the documentation.