Hi all,
I just wrote a decorator to validate if an object(say Blog) exists:
def require_blog_item_exists(func):
def _decorated_func(request, blog_id, *args, **kwargs):
try:
blog = Blog.objects.get(id = blog_id)
return func(request, blog_id, *args, **kwargs)
except:
return HttpResponseRedirect('error')
return _decorated_func
An idea pops into my mind, that why not cache the blog object in
func.func_globals to avoid extra database retrieval operation? So I
wrote following codes:
from new import function as new_function
def update_func(func, extra_globals):
new_globals = func.func_globals.copy()
new_globals.update(extra_globals)
return new_func(func.func_code, new_globals, func.func_name,
func.func_defaults, func.func_closure)
def require_blog_item_exists(func):
def _decorated_func(request, blog_id, *args, **kwargs):
try:
blog = Blog.objects.get(id = blog_id)
f = update_func_globals(func, {'blog':blog})
return f(request, blog_id, *args, **kwargs)
except:
return HttpResponseRedirect('error')
return _decorated_func
However, it also reports error. Can anyone explain to me what's wrong
with the codes?
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