[storm] Dynamically change __storm_table__ is it possible?

[Steve Kieu]

One more great thing I learnt - Thank a lot, will try that soon.

class declaration any where, wow ....

:-)



On Wed, Apr 13, 2011 at 7:46 AM, Dirley <dirleyrls at gmail.com> wrote:
> You can dynamically subclass without eval. Like that:
>
> class A(object):
>     __storm_table__ = 'a'
> def make_subclass(base, storm_table):
>     class DynamicallyGeneratedSubclass(base):
>         __storm_table__ = storm_table
>     return DynamicallyGeneratedSubclass
> C = make_subclass(A, 'c')
> issubclass(C, A) # True
> C.__storm_table__ # 'c'
> 2011/4/12 Steve Kieu <msh.computing at gmail.com>
>>
>> Hi,
>>
>> Thanks for replying, I have thought about subclassing but how to do it
>> dynamically. The only one way I can think of is dynamically generate
>> python string contains the class definitions and then eval it to
>> return the class object.
>>
>> Where is my python doc for eval-ing string :-)
>>
>> Any other way better than this?
>>
>> Cheers,
>>
>>
>>
>>
>> On Wed, Apr 13, 2011 at 6:48 AM, Gustavo Niemeyer
>> <gustavo.niemeyer at canonical.com> wrote:
>> >> I have tried to use setattr(AccessLog, '__storm_table__',
>> >> 'table-name')  which get rid of the error. However I can only set it
>> >> once. Reset it to another value will not work, it still pointing to
>> >> the old one.
>> >
>> > Yes, as you have figured the attribute is cached for performance, so
>> > that kind of trick won't work indeed.
>> >
>> > What you can do, though, is have multiple subclasses and define custom
>> > tables for them.
>> >
>> > --
>> > Gustavo Niemeyer
>> > http://niemeyer.net
>> > http://niemeyer.net/blog
>> > http://niemeyer.net/twitter
>> >
>>
>>
>>
>> --
>> Steve Kieu
>>
>> --
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>
>



-- 
Steve Kieu