Hello Gerdus,
> Is there an easy way to get SQL calculated attributes using storm?
(...)
> I want to turn getBalance into balance property.
> e.g: balance = SQLvalue("SELECT sum(amount) FROM entry")
> I know it can be done using balance = property(getBalance) etc, but a
> convenience function would be great.
Yes, using a property is the way to go in these cases. If you use that
frequently, you can easily write a helper (untested code):
def sqlattr(expr):
def sql_property(self):
return Store.of(self).execute(expr).get_one()[0]
return property(sql_property)
At this point, this isn't something enough people have demonstrated
interest for that would be worth adopting in the core.
> Also is there a method that is called on an Entity when it is retrieve
> from the store? __init__ does not seem to be called.
Yes, the __load__() method is called in that situation.
--
Gustavo Niemeyer
http://niemeyer.net
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