Am Mo,04.08.2008 um 00:19 schrieb James Gregurich:
thanks for the response. Adding the property is straight forward.
The key parts that are not clear to me are:
1) how exactly do you set up a predicate to walk an extra entity to
get to the target entity.
Loook at the documentation of NSPredicate
You do not "set the target entity" as a preidate. A predicate is
something liike a pattern, i.e. "color = blue". This can apply to the
entity cars and to to the entity jeans.
The fetch request gets the entity, to whom the predicate is applied.
2) how do you specify the destination entity. pass it to
[NSFetchRequest setEntity:] and pass that fetch request to
[NSFetchedPropertyDescription setFetchRequest:]? I would assume in
my example that my destination entity is the story.
NSEntityDescrition* entity = [NSEntityDescription
entiityForName:@"story" inManagedObjectContext:/*you know*/];
Cheers
-James Gregurich
Engineering Manager
Markzware
On Aug 3, 2008, at 10:37 AM, Omar Qazi wrote:
Create an NSFetechedPropertyDescription by setting up a fetch
request in code, then add the property using the setProperties
method of NSEntityDescription. It is only possible to edit an
NSEntityDescription if you are not associated with a persistent
store coordinator, so be careful. You might want to just add a
custom method to the class of your Core Data model to execute the
fetch request and get the job done.
Omar Qazi
Hello, Galaxy!
1.310.294.1593
On Aug 3, 2008, at 9:49 AM, James Gregurich wrote:
greetings!
I'm trying to figure out how to dynamically (in code) set up a
fetched property with a Coredata in-memory store. The
documentation is not detailed enough for me to quite see what the
correct way to set the code up is and I'm not finding much in the
way of useful sample code when searching on
NSFetchedPropertyDescription.
What is the correct way to programmatically add a fetched property
to the box to get the list of stories for a given box managed
object?
thanks,
James Gregurich
Engineering Manager
Markzware
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