On Jul 9, 2009, at 1:45 PM, Lon Varscsak wrote:
I want to know if it's being changed. I have a controller object that
will need to recalculate some values when a specific attribute changes
in the EO.
Why not just override the set... method to send the notification?
-Lon
On Thu, Jul 9, 2009 at 1:42 PM, Mark
Morris<[email protected]> wrote:
Just a clarification, do you want to know when the value changes,
even if
it's not saved to the database? Or do you just want to know if a
change is
being saved? That would make a difference. ;-)
Regards,
Mark
On Jul 9, 2009, at 3:28 PM, Lon Varscsak wrote:
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<[email protected]
>
wrote:
Thanks for the tips!
-Lon
On Thu, Jul 9, 2009 at 12:34 PM, Chuck Hill<[email protected]
>
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<[email protected]
>
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 <[email protected]>:
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 ([email protected]
)
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/webobjects-dev/simon%40potwells.co.uk
This email sent to [email protected]
--
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 ([email protected])
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/webobjects-dev/markm%40onpointsoftware.com
This email sent to [email protected]
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Webobjects-dev mailing list ([email protected])
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/webobjects-dev/chill%40global-village.net
This email sent to [email protected]
--
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 ([email protected])
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/webobjects-dev/archive%40mail-archive.com
This email sent to [email protected]
