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From: Bud P. B. <bu...@si...> - 2003-05-23 08:31:56
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Actually, I've thought more about the issue below. The problem aren't properties, the problem are when you define them: either at class creation time (via __metaclass__ and inheritance from SQLObject) or at runtime after the class is created: In the former case, you define property setters and getters before the user can and the user has to take you setters and getters into consideration--in the latter case, you have to take possible setters and getters defined by the user into consideration. This should be possible through introspection...??? --b On Thu, 22 May 2003 23:10:33 +0200 "Bud P. Bruegger" <bu...@si...> wrote: > > Oh, and I'm not sure what we're talking about as far as properties go. When > > I said 'manually defining properties will be ignored' i meant SQLObject > > doesn't care about them, and they'll work fine. > > Not sure whether I misunderstand, so to find out here is how I think > about the issue. Every column corrsponds to a property whose setter > method is overloaded to store the object in the dbms. If application > programmers have a reason to (independently of SQLObject) make the > same attribute into a property, they have to possibly call SQLObject's > setter method from their setter method (in the same way as the > __init__ of a subclass usually calls the __init__ of the superclass). > One possible example of such as thing would be to log all state > changes to a file. > > So if this understanding of what is happening is accurate, application > programmer need to take special steps when defining properties related > to columns. Or to avoid that, use the non-standard-python shortcut > method to define properties. So in any case, the way to define > properties (related to columns) is different from that of plain pyton. > In contrast, if column values are simply represented in the __dict__ > of the instance, everything is as in plain python. /----------------------------------------------------------------- | Bud P. Bruegger, Ph.D. | Sistema (www.sistema.it) | Via U. Bassi, 54 | 58100 Grosseto, Italy | +39-0564-411682 (voice and fax) \----------------------------------------------------------------- |
