[storm] persistable members in a dict?

[Tim Stebbing]

attrs = Pickle(default={})   #proceed to jam anything you like in
there, just don't expect to use it in a where clause

On 9/12/07, Tom Vaughan <tom at software6.net> wrote:
> Hi,
>
> As an example, I'd like to have a class that looks like:
>
> class Channel(Persistable):
>
>         __storm_table__ = 'channel'
>
>         channelno = Int(primary=True)
>
>         __attrs__ = {
>                 'frequency': {
>                         'uom': 'GHz',
>                         'value': Float(),
>                 },
>         }
>
> This is so I can attach metadata (like unit of measure is Hz or GHz)
> to object members. And also so that I can have, for example, a toxml
> method that would produce:
>
> <channel><frequency uom="GHz">2.4</frequency></channel>
>
> by easily iterating over __attrs__, and using the class name and the
> 'value' of the __attrs__ dict as special cases. And, if Persistable
> above properly overrides __getattr__ and __setattr__, I can still do:
>
> channel.frequency = 2.4
>
> I know that I've hardcoded the metadata, and that the metadata won't
> be stored in the database. I'm not worried about that now. And I
> really don't want to subclass Int, Float, etc. for all the different
> types of data I have and store each of these in their own table, etc.
> I want something that (to me at least) is quick and simple, and a way
> to collect all of the persistable members into one data structure. But
> of course this breaks:
>
> store.add(channel)
>
> Hopefully this is clear. Can anyone think of a way I could do this?
> Perhaps by extending Store?
>
> Thanks.
>
> -Tom
>
>
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-- 
Timothy J Stebbing