Re: RFC: schema by interface

On Thu, 13 Apr 2006 21:12:33 +0100, whit  
<whit-UE+B0n23d/[email protected]> wrote:

> Finally, insomnia gave me enough time to try this:
>
> http://svn.plone.org/svn/archetypes/Archetypes/branches/whitmo-schema-by-iface/
>
> there is one test failure and one error(not sure if these are related).  
>       Essentially, all calls to BaseObject.Schema now get passed to  
> ISchema(self).  The adapter takes care of fetching the schema object  
> from the instance and doing the aquisition wrapping.

Yay :)

Do you want to spell out the main benefits of doing this, for the record?


> here is one simpler alternative, registering a function as the schema  
> factory requires less code and is probably easier to understand::

Erm... I don't quite understand it :)

What's the point of doing this?

>  >>> from Acquisition import ImplicitAcquisitionWrapper as wrap
>  >>> def pschema_fetcher(inst):
> ...     return wrap(inst.schema)
>
> I'm curious to see if the following would work::
>
>  >>>from mytype import MyATSchema # some schema built at import time
>  >>>def module_schema_fetcher(inst):
> ...    return wrap(MyATSchema)
>
> The next obvious step is something like this::
>
>  >>> from archetypes.schema.interface import ILocalSchema
>  >>> from zope.component import getUtility
>  >>> def utility_schema_fetcher(inst):
> ...     util = getUtility(ILocalSchema, name="schema_locker")
> ...     schema=util.composeSchema(inst)
> ...     return wrap(schema)

Sorry, it's late, but can you explain what you're doing here?

Martin

-- 
(muted)



-------------------------------------------------------
This SF.Net email is sponsored by xPML, a groundbreaking scripting language
that extends applications into web and mobile media. Attend the live webcast
and join the prime developer group breaking into this new coding territory!
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642