Re: saveChanges() not saving
Re: saveChanges() not saving
- Subject: Re: saveChanges() not saving
- From: Chuck Hill <email@hidden>
- Date: Thu, 1 Mar 2007 10:54:00 -0800
No, I only had the regular size of stone tablet. Four commandments
and I ran out of room. Obviously, Moses shopped at Costco.
I supposed this could be considered a commandment, but it more falls
under locking.
Chuck
On Mar 1, 2007, at 10:50 AM, Jerry W. Walker wrote:
Hi, Chuck,
That's interesting. I went to the EOF commandments page and
couldn't find the commandment:
* Don't do anything with a newly created Editing Context until
you've locked it and be sure to unlock it at the end of your use,
or at the end of your R-R cycle. (Don't worry about the WOSession's
defaultEditingContext since WOSession locks it for the entire
session.)
Didn't that use to be in there?
Regards,
Jerry
On Mar 1, 2007, at 1:25 PM, Chuck Hill wrote:
David,
In at least one place in your code you are abusing EOF. This
makes EOF very cranky and, in return, it messes with your head.
Play nice and your problems will go away. :-)
First, check very carefully that you are not violating one of the
EOF Commandments:
http://en.wikibooks.org/wiki/Programming:WebObjects/EOF/Using_EOF/
The_EOF_Commandments
Please don't respond that you are violating one of them and it is
just fine, because that is quite obviously not true. I mention
this because this is often the first response of commandment
violators. Thou shalt not. Really. :-)
Next, enable NSLog.DebugGroupMultithreading and run through the
app. Look for exception traces in the log that indicate unlocked
access. Unlocked access is like playing Russian Roulette with one
empty chamber. Fix them.
Chuck
On Mar 1, 2007, at 9:40 AM, David Haggerty wrote:
I have come across a rather strange problem. Changes to an EO
are not saving properly. In memory it shows that I have changed
the EO but when I look at the editingContext, it doesn't show it
in _unprocessedChanges. It also doesn't save the change that I
am making. I finally realized that if I call
ec.committedSnapshotForObject(ecr); BEFORE I make any changes to
the object, it works fine.
Here's an example of the code:
EOEditingContext ec = new EOEditingContext();
// If I uncomment this, it saves properly.
// ec.committedSnapshotForObject(ecr);
EmailCommunicationRecipient ecr = (EmailCommunicationRecipient)
EOUtilities.faultWithPrimaryKeyValue(ec,
"EmailCommunicationRecipient", new Integer(11312312));
ecr.setDateSent(new NSTimestamp());
ec.saveChanges();
Strangely, if I do the following, the dateSent won't save but the
status will:
EOEditingContext ec = new EOEditingContext();
EmailCommunicationRecipient ecr = (EmailCommunicationRecipient)
EOUtilities.faultWithPrimaryKeyValue(ec,
"EmailCommunicationRecipient", new Integer(11312312));
ecr.setDateSent(new NSTimestamp());
ec.committedSnapshotForObject(ecr);
addObjectToBothSidesOfRelationshipWithKey(aValue,
"toCurrentStatus");
ec.saveChanges();
The only thing special with EMailCommunicationRecipient is that
it is a single table inhertance in the model.
EMailCommunicationRecipient extends CommunicationRecipient which
extends AbstractCommunicationRecipient.
Until I figure out what's going on, I was going to just add the
following (because I just don't know how many places this is
happening). Will this add much overhead?:
public void awakeFromFetch(EOEditingContext ec){
super.awakeFromFetch(ec);
ec.committedSnapshotForObject(ecr);
}
Thanks,
David
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__ Jerry W. Walker,
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Strength Internet Enabled Systems
email@hidden
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problems.
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