Actually I'd was more thinking along the lines of the referenced object acting just like the object that it's linked to. Meta-type too. <dtml-in "objectValues(['MyApples'])"> will get you the references to any apples in that folder too. It allows you to have an object in two places(being a physical distinction which matters in Zope) without duplicating the filespace and work to create a second object. All my best, Johan Carlsson writes:
One problem with having a reference count base class that's responsible for inactivate/delete the reference object is that Zope lacks a event model. If a folder/container is deleted it doesn't inform its siblings before it's deleted. And that may lead to invalid reference objects. I think ZCatalog have the same problem?
There is a pointer product in the download section, have you looked at it?
Opps, it is not in the download sction any more.
Anyway, it's a Symbolic Link Product by Ty Sarna at Endicor Technologies, Inc that reference a pointer object to a folder object base on a URL.
There is no way to control the acqusition path nor detect object if the object is moved or deleted. Only links to folder are supported (as far as I can see).
If you what to play with it I could send you a copy of the tar ball.
//Johan
//Johan
I meant to use resolve_url, to find any references to an object upon it's deletion. Changes in an object's state really wouldn't matter if there is a way to truely 'mirror' an object. The name spaces would have to either be selectable, or since it is a mirror, then it aquires the name space of the object that it is mirroring (and exact mirror). Like I said, I don't have any idea if this 'pointer' is even possible in the ZODB. Anyone from DC thinkning about this?
All my best,
Jason
Johan Carlsson writes:
Yes, I have thought about it.
One solution I thought of is use an object referens counter base class for "referencable objects". The base class should be responsible for manageing references and take action on the references when the objects state changes.
One problem is how to handle acqusition. Should the referenced object be viewed in it's own context or the reference objects context? Or should the contexts merge?
How did you intend to use ZCataloges for the ZMirror?
//Johan
Zopsters,
This is very out of the blue, but has anyone thought about
tackling the
'reference' question by using a phantom Zope object? I don't know nearly enough Python to answer this question, but maybe someone can.
Is it possible to create a 'Reference' object that really stores the url of another object and maquerades as the other object's meta_type. Anything that is asked of the 'Reference' object, just get's passed along to the real object in it's place? Obviously whenever you delete an object any 'References' with that object's url stored in them get deleted too(ZCatalog could hold these). Sort of like a reflective mirror. You see the object in the mirror but you aren't actually looking at the object, you are looking at the mirror. A ZMirror.
All my best,
-- Jason Spisak 444@hiretechs.com
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Jason Spisak CIO HireTechs.com 6151 West Century Boulevard Suite 900 Los Angeles, CA 90045 P. 310.665.3444 F. 310.665.3544 Under US Code Title 47, Sec.227(b)(1)(C), Sec.227(a)(2)(B) This email address may not be added to any commercial mail list with out my permission. Violation of my privacy with advertising or SPAM will result in a suit for a MINIMUM of $500 damages/incident, $1500 for repeats.