That's a good way to eat up memory in the python process. I would have
saved a lot of headaches and just used select() with cache, possibly
exploiting memcache or redis to do the hard job. Don't take this the wrong
way, the cached_property is a neat trick, it's just not that suitable for
storing your zillions participant when you'll grow big.
On Friday, August 16, 2013 10:25:32 AM UTC+2, Ykä Marjanen wrote:
>
> Hi,
>
> After learning Python and web2py deeper, I've restructured my web2py
> application so that all functions and data are now in classes with lazy
> methods in my own module. The lazy property class turns any method into a
> "cached attribute", thus I can make a db query that returns rows and if it
> is called again it uses the previous result.
>
> What this has allowed me to do, is to clean practically all code in my
> controller as the logic and variables are in a class. Now I just pass the
> class to the view and the view prints the "attributes" directly without
> separate call and saving to dict. I've read that some don't like any logic
> in the view, but that's unavoidable as in the view you need to print stuff
> depending who the user is and is he logged in or not.
>
> I'd like your opinions and comments on my strategy. Here are few
> simplified examples from my code:
>
> Module:
>
> class MyClass(object):
> def __init__(self):
> self.db = current.db
>
> @cached_property
> def all_participants(self):
> return self.db(self.db.participant.id>0).select()
>
> class MyClassParticipant(MyClass):
> "Inherits base class"
> def __init__(self, auth_user_id=None):
> self.auth_user_id = auth_user_id
>
> super(MyClassParticipant, self).__init__()
>
> @cached_property
> def participant_stats(self):
> return
> self.db(self.db.participant.auth_user_id==self.auth_user_id).select()
>
> Controller:
>
> def index():
> if auth.user:
> xclassinstance =
> module.MyClassParticipant(auth_user_id=auth.user_id)
> else:
> xclassinstance = module.MyClass()
>
> return dict(xclassinstance=xclassinstance)
>
> View:
>
> {{if auth.user:}}
> Your ranking is {{=xclassinstance.participant_stats.ranking}}
>
> Rankings of all participants
> <br />
> {{for participant in xclassinstance.all_participants:}}
> {{=participant.name}} ranking is {{=participant.ranking}}
> <br />
>
> Ykä
>
>
>
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