Re: [Zope-dev] More comments on ZPatterns
Thus spake Phillip J. Eby ([EMAIL PROTECTED]): and when I ask one of my TableInfo instances for their footnote it comes right out of MySQL! Cool. Now.. I can't seem to figure out how to *change* the data in the database when the user 'edits' the Here's some more top-secret documentation... Use a GenericTrigger to implement attribute changes. Set up your trigger to be activated on object changes, and set the trigger expression to call an SQL method, e.g.: First off it is amazing what a rush it is to fight ZPatterns, and finualy start winning. g Anyway, Under Zope 2.2, the 'Upon' property of a trigger doesn't have a list of 'event_kinds'. I think this is related to an earlier post where i complained about zope 2.2 not being able to get such values (for select types) from aquisition, or in this case from a seperate property in its class. Has anybody thought of a way to address this problem, as it didn't sound like the official zope distribution wants to act the way that would allow the 'Upon' property to get its proper values right now. (no, i'm not going to go off about that g) Also, should i not be trying to use ZPatterns 4aX under Zope 2.2? I thought i read that to use triggers a person should use Zope 2.2, but it doesn't appear this has been tested under 2.2. (although it is alpha, i haven't forgotten that) ZPatterns is starting to taste pretty sweet. Keep up the good work! sRp -- Scott Parish http://srparish.net/ PGP signature
Re: [Zope-dev] ZPatterns: DropZone example
Thus spake Phillip J. Eby ([EMAIL PROTECTED]): That's all quite true, but it would probably be simplest to do such a thing using AttributeProviders and SheetProviders in the white-box specialists. It does seem reasonable to have those providers talk to an AccountingProcessor object if you want to make your framework talk to different back-ends, but I think it is misleading and incorrect to call AccountingProcessor a specialist, as it's not an application-level service object, but a private implementation helper. Does anybody out there have even the slightest clue about how to go about using AttributeProviders and SheetProviders? A select few terse hints on this subject would really help us (me) figure it out enough to start working on some howto's. Interestingly, you've just given me what may be a motivating example for using Shane Hathaway's DatabaseAPI in conjunction with ZPatterns, assuming of course that I've correctly understood his most recent explanation of the DatabaseAPI product. Am i wrong in thinking that DatabaseAPI is a completely separate solution to the same problem that ZPatters is suppose to address? Personally i have to give DatabaseAPI props for being quite easy to understand and use, while not sacrificing power. sRp -- Scott Parish http://srparish.net/ PGP signature
Re: [Zope] ZPatterns: Deleting objects from a Rack?
Thus spake Chris Withers ([EMAIL PROTECTED]): Ty Sarna wrote: call the manage_delete() method on the object. That is, you ask the object to delete itself. This seems unnecessarily long-winded to me. What are the reasons for it being like this? (examples are good... ;-) However, once you have the object, operations on the object should be done as methods on the object. I'm sure it's against Demeter's Law (I've read the Wiki ;-) to work this way. You should ask the rack to delete an object and it can process this how it wants... most often this would be by asking the object to delete itself, but maybe it's be more efficient for the rack to just delete the object (for example, if the object is actually a row in an SQL table) I could be mistaken about this, as I'm still having trouble following the ZPatterns train of thought, but I think the reason that the object needs to delete itself is that the object may not be stored in a single place. For instance, the object might be created from 5 rows from seperate tables in an SQL db and 2 attributes gotten from LDAP. I'm not entirely clear how asking the object to delete itself in this case is going to improve the situation over just asking the rack to, but I think that was the intent. sRp -- Scott Parish http://srparish.net PGP signature
[Zope-dev] LoginManager add trouble
Using: Zope2 (cvs) ZPatterns 0.3.0 LoginManger 0.8.6 When I try to add a LoginManager, I get the following error and traceback. Any ideas? sRp - Error Type: KeyError Error Value: _owner Traceback (innermost last): File /a4/srp/Zope2/lib/python/ZPublisher/Publish.py, line 222, in publish_module File /a4/srp/Zope2/lib/python/ZPublisher/Publish.py, line 187, in publish File /a4/srp/Zope2/lib/python/Zope/__init__.py, line 221, in zpublisher_exception_hook File /a4/srp/Zope2/lib/python/ZPublisher/Publish.py, line 171, in publish File /a4/srp/Zope2/lib/python/ZPublisher/mapply.py, line 160, in mapply (Object: manage_addLoginManager) File /a4/srp/Zope2/lib/python/ZPublisher/Publish.py, line 112, in call_object (Object: manage_addLoginManager) File /a4/srp/Zope2/lib/python/Products/LoginManager/LoginManager.py, line 230, in manage_addLoginManager File /a4/srp/Zope2/lib/python/OFS/ObjectManager.py, line 249, in _setObject (Object: ElementWithAttributes) File /a4/srp/Zope2/lib/python/AccessControl/Owned.py, line 267, in manage_fixupOwnershipAfterAdd (Object: SheetProviderContainer) File /a4/srp/Zope2/lib/python/AccessControl/Owned.py, line 174, in changeOwnership (Object: SheetProviderContainer) KeyError: (see above) -- Scott Parish http://srparish.net PGP signature
