Re: [Zope-dev] to __of__ or not to __of__ ?
Hi Casey,
--On Mittwoch, August 14, 2002 23:38:52 -0400 Casey Duncan [EMAIL PROTECTED]
wrote:
The Item class mixes in Traversable, which is probably responsible for
making this work TTW. It also gives you a bunch of other stuff that many
Zope classes need, like DAV support, copy support, ZMI tab support and
security. It doen't mix-in acquisition tho.
If you need support for acquistion machinery (including __of__ which
creates wrappers), then you need to mix-in Acquisition.Implicit. The
SimpleItem class mixes this and Persistence in for you (along with
Item), so many Zope classes derive form SimpleItem. You need Persistence
to store instances of your class in the ZODB, and implicit acquisition
is the standard for Zope objects.
I actually don't know, if I need acquisition. The items are stored in the
btree of
the table, and I experienced no problems till now. I can copy and
export/import AixtraTable instances and the data is preserved.
In short I would recommend mixing in SimpleItem or you may find that your
objects are not stored properly in the ZODB.
Is that also true, if I store them in a btree ?
-Casey
BTW: People will take you a lot more seriously on this list if you loose
the
# {{{ ... #}}} crutches ;^)
I use a folding editor (jed) and these are the folding marks. Folding makes
your
editing live much easier. ;-))
Mit freundlichen Grüßen Joachim Schmitz
AixtraWare Ingenieurbüro für Internetanwendungen
Hüsgenstr. 33a, D-52457 Aldenhoven
Telefon: +49-2464-8851, FAX: +49-2464-905163
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Keyserver: http://www.keyserver.net/en/
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Re: [Zope-dev] to __of__ or not to __of__ ?
At 23:38 2002-08-14 -0400, Casey Duncan said:
The Item class mixes in Traversable, which is probably responsible for
making
this work TTW. It also gives you a bunch of other stuff that many Zope
classes need, like DAV support, copy support, ZMI tab support and security.
It doen't mix-in acquisition tho.
If you need support for acquistion machinery (including __of__ which creates
wrappers), then you need to mix-in Acquisition.Implicit. The SimpleItem
class
mixes this and Persistence in for you (along with Item), so many Zope
classes
derive form SimpleItem. You need Persistence to store instances of your
class
in the ZODB, and implicit acquisition is the standard for Zope objects.
In short I would recommend mixing in SimpleItem or you may find that your
objects are not stored properly in the ZODB.
-Casey
You also might want to wrap the object before returning them,
because the are stored in _item and not in the AixtraTableProduct.
def getItem(self,key): #{{{
returns item
data = self._items
if data.has_key(key):
item = self._items[key]
if not hasattr(item,'key'):
setattr(item,'key',key)
return item.__of__(self) --- wrap the item before returned
Regards,
Johan Carlsson
--
Torped Strategi och Kommunikation AB
Johan Carlsson
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Mail:
Birkagatan 9
SE-113 36 Stockholm
Sweden
Visit:
Västmannagatan 67, Stockholm, Sweden
Phone +46-(0)8-32 31 23
Fax +46-(0)8-32 31 83
Mobil +46-(0)70-558 25 24
http://www.torped.se
http://www.easypublisher.com
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Re: [Zope-dev] to __of__ or not to __of__ ?
The Item class mixes in Traversable, which is probably responsible for making
this work TTW. It also gives you a bunch of other stuff that many Zope
classes need, like DAV support, copy support, ZMI tab support and security.
It doen't mix-in acquisition tho.
If you need support for acquistion machinery (including __of__ which creates
wrappers), then you need to mix-in Acquisition.Implicit. The SimpleItem class
mixes this and Persistence in for you (along with Item), so many Zope classes
derive form SimpleItem. You need Persistence to store instances of your class
in the ZODB, and implicit acquisition is the standard for Zope objects.
In short I would recommend mixing in SimpleItem or you may find that your
objects are not stored properly in the ZODB.
-Casey
BTW: People will take you a lot more seriously on this list if you loose the
#{{{ ... #}}} crutches ;^)
On Wednesday 14 August 2002 05:29 pm, Joachim Schmitz wrote:
Hi,
in my AixtraTable product the newItem method is defined like this:
def newItem(self,key): #{{{
returns item
data = self._items
if data.has_key(key):
return None
else:
item = makeItem(key,self.FieldList)
data[key] = item
self.catalog_object(item)
return data[key]
#}}}
where self._items is:
self._items = OOBTree()
and the makeItem-Class is:
class makeItem(Item): #{{{
AixtraTable Item class
def __init__(self, key, fieldlist):
self.id = key
for f in fieldlist:
setattr(self,f,)
#}}}
it only worked, when I inherited from Item, otherwise I could not access
the items from the web, my guess is, cause they had no acquisition
wrappers. Can I achieve the same with the __of__ magic and how ?
you can download the product from
http://www.zope.org/Members/perry/AixtraTable
Mit freundlichen Grüßen Joachim Schmitz
AixtraWare Ingenieurbüro für Internetanwendungen
Hüsgenstr. 33a, D-52457 Aldenhoven
Telefon: +49-2464-8851, FAX: +49-2464-905163
Key fingerprint = DA10 CC82 62F8 1DBB 39A1 1EDC 725B 3317 A8D7 C3A6
Keyserver: http://www.keyserver.net/en/
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