[Product-Developers] paster, AnnotationStorage and the daily cup of ...
mikko+plone at redinnovation.com
Sat Sep 19 08:42:37 UTC 2009
Paster archetype template seem to set AnnotationStorage for title and
description by default.
VariantProductSchema['title'].storage = atapi.AnnotationStorage()
VariantProductSchema['description'].storage = atapi.AnnotationStorage()
""" Buyable physical good with variants of title and price and
multiple images """
meta_type = "VariantProduct"
schema = VariantProductSchema
title = atapi.ATFieldProperty('title')
description = atapi.ATFieldProperty('description')
I just checked from AT code and AnnotationStorage uses OOBTree object
context.__annotations__ as storage backend.
What I have learnt from Zope world is that objects loaded from OOBTree need
extra database lookup. This is correct right?
Because title and description are read almost always when the object is
being accessed isn't this ineffective? If we open a page for viewing AT
object created by paster we'd have to do three different database look-ups
instead of one?
Load title for the object from annotations
Load description for the object from annoations
If we used AttributeStorage this would be:
Load object (and get title and description on the same fetch)
Have I understood everything involved here?
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