[Zope-PAS] mutable property sheets

[Jens Vagelpohl]

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On 16 Apr 2006, at 18:27, Wichert Akkerman wrote:

> Previously Jens Vagelpohl wrote:
>> I hate to say it, but GRUF isn't an example for anything right or
>> good when it comes to user folders. And that opinion goes right up to
>> the top in Plone circles.
>
> No argument there. But considering how popular GRUF is its  
> behaviour is
> a good measure of what people are used to.

IMHO this makes that specific behavior a candidate for being in the  
Plone layer as opposed to the PAS layer. Or at least set up in PAS so  
it is not the default behavior.


>> So my own opinion is that I don't like the persistence magic for
>> setting properties. IMHO the methods on the properties plugins should
>> be called explicitly instead of automatically whenever anyone touches
>> one of these mutable property sheets.
>
> That makes your code very verbose though. For all changes you have to
> figure out which plugin the property belongs to, figure out which user
> folder should be used, get the plugin from that userfolder and call a
> method on that.

There's two specific reasons I have for not liking it. First of all,  
it's magic. Magic is  just plain bad in my book. Simple and explicit  
is better. Secondly, I fear implementations inadvertently writing  
more than necessary into a potentially expensive data store (think  
RDBMs, LDAP, etc).

jens

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