Re: Detecting eo changes when they happen
Re: Detecting eo changes when they happen
- Subject: Re: Detecting eo changes when they happen
- From: Chuck Hill <email@hidden>
- Date: Tue, 10 Oct 2006 16:52:31 -0700
On Oct 10, 2006, at 3:09 PM, Florijan Stamenkovic wrote:
Hi Chuck,
If nothing like that exists, I am thinking of implementing it
through a notification posting EOGenericRecord subclass. Any
comments or tips about this?
There is a discussion and implementation of what you want in
Practical WebObjects starting on page 67. You really need the
help of the EC.
If I understand it correctly, your editing context subclass posts
notifications once objects are saved to the persistent data store.
Not quite. It can notify before a change, after a change but before
a commit (save changes), and after a commit.
I need notifications being fired on every edit of any EO in my app,
not in the persistent store, but in the editing context. I need
that to fire Swing events,
I imagine that this makes quite some difference, both as this is
happening client side and for Swing's general architecture.
but didn't point that out in my original post. And, I need them to
fire *after* object(s) have been edited.
How about overriding all takeValue...() methods? Would that be
inadvisable?
Yes, that probably makes the most sense for what you are trying to do.
One more question: EOs are not automatically removed from to-many
relationships after being deleted, even when their delete rule is
set to nullify. Is this another client side EOClassDescription
bug, or a standard behavior?
That is standard behavior. Delete rules are processed as part of
the preparation work done in saveChanges(). You can call
ec.processRecentChanges() to force this to happen earllier.
Good to know. Does that make sense? Shouldn't the object store
reflect the latest changes to EOs managed in that store? Maybe I am
missing something though...
I don't think that I can argue that this makes sense. :-) I have
always wondered why this needed to be like this. My best guess is
that it was done as a performance optimization.
Chuck
--
Coming in late 2006 - an introduction to web applications using
WebObjects and Xcode http://www.global-village.net/wointro
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems. http://www.global-village.net/products/practical_webobjects
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