Uh, another question. :) Since I have a custom EO super-super class, I decided to try to implement this in takeStoredValueForKey(..).
It works, although I was also trying to post the "old" value, and asking for this current value at this point makes EOF not so happy...but that's not strictly required for my needs. However, it does post notifications even for fetched objects, what would be the best way to only post changes after fetching? Thanks again, Lon On Thu, Jul 9, 2009 at 12:43 PM, Lon Varscsak<varsc...@smarthealth.com> wrote: > Thanks for the tips! > > -Lon > > On Thu, Jul 9, 2009 at 12:34 PM, Chuck Hill<ch...@global-village.net> wrote: >> >> On Jul 9, 2009, at 12:26 PM, Lon Varscsak wrote: >> >>> Thanks. I figured there was nothing built to do exactly what I >>> needed, but I figured I would ask. >>> >>> Do you know if there is much overhead if I implemented this in my EO >>> superclass even if there were no observers? >> >> EOF makes heavy use of notification. I would not expect there to be much >> overhead. You will probably want to qualify the notification with the EC >> (depending on what it is you are trying to do) to limit the number of >> observers. And then keep the method receiving the notification fast. The >> notifications are synchronous, so you don't want anything slow in this >> method. >> >> >> Chuck >> >> >> >>> >>> -Lon >>> >>> On Thu, Jul 9, 2009 at 11:50 AM, Simon McLean<si...@potwells.co.uk> wrote: >>>> >>>> also, if you are using wonder, check out >>>> hasKeyChangedFromCommittedSnapshot in ERXGenericRecord. maybe listen >>>> for the notification mentioned by chuck, then use >>>> hasKeyChangedFromCommittedSnapshot to check the particular key you are >>>> looking at. >>>> >>>> simon >>>> >>>> 2009/7/9 Chuck Hill <ch...@global-village.net>: >>>>> >>>>> On Jul 9, 2009, at 10:24 AM, Lon Varscsak wrote: >>>>> >>>>>> Is there a way for a controller object to listen for changes to an EO >>>>>> (and a specific key)? >>>>>> >>>>>> Thanks, >>>>>> >>>>>> Lon >>>>> >>>>> EOEditingContext has ObjectsChangedInEditingContextNotification, but it >>>>> is >>>>> on an object by object basis, not a key by key one. >>>>> >>>>> You could implement this in your EO super class. >>>>> >>>>> >>>>> Chuck >>>>> >>>>> -- >>>>> Chuck Hill Senior Consultant / VP Development >>>>> >>>>> 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 >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> Do not post admin requests to the list. They will be ignored. >>>>> Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) >>>>> Help/Unsubscribe/Update your Subscription: >>>>> >>>>> http://lists.apple.com/mailman/options/webobjects-dev/simon%40potwells.co.uk >>>>> >>>>> This email sent to si...@potwells.co.uk >>>>> >>>> >>> >> >> -- >> Chuck Hill Senior Consultant / VP Development >> >> 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 >> >> >> >> >> >> >> > _______________________________________________ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/webobjects-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
