Hi there,
On 19/11/2005, at 4:46 PM, Randy Becker wrote:
I'm coming up against some issues with modifying my database -
whenever I modify an object, the change is reflected in the
database, but is not displayed correctly until the current session
is ended and a new one created. Am I doing something wrong when I
change the DB?
I'm doing something like this:
EOEditingContext editingContext = session().defaultEditingContext();
EOEnterpriseObject newRequest = EOUtilities.createAndInsertInstance
( editingContext, "Request" );
Object itemPK = EOUtilities.primaryKeyForObject( editingContext,
requestedItem).objectForKey("itemPK");
Why are you dealing with the primary/foreign keys in code?
Unless you really need to know about it you shouldn't deal with them
at all. It's a database artefact that your application doesn't need
to concern itself with. i.e., let EOF handle them transparently. In
your EOModel make sure that these keys are _not_ class attributes.
newRequest.takeValueForKey( itemPK, "itemPK" );
newRequest.takeValueForKey( personPK, "personPK" );
Don't create relationships like that. You need to think in Objects
and not database fields. EOF will translate your objects appropriately.
Person aPerson = EOUtilities.createAndInsertInstance(ec, "Person");
Item anItem = EOUtilities.createAndInsertInstance(ec, "Item");
Request aRequest = ( Request )EOUtilities.createAndInsertInstance
( ec, "Request" );
aRequest.addObjectToBothSidesOfRelationshipWithKey( anItem, "items" );
...
aRequest.addObjectToBothSidesOfRelationshipWithKey( thePerson,
"person" );
aRequest.takeValueForKey( new NSTimestamp(), "dateRequested" );
ec.saveChanges();
"Dashboard" won't display the correct information until I end the
session and create a new one.
If you update your _eoobjects_ correctly then you'll always see your
changes consistently.
Have you been through the Apple tutorial for Web Applications?
with regards,
--
Lachlan Deck
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