[calcop]

Hello everyone,

I have discovered the awesome power of the Core Data system. I have
one question though. I have set up relationships (which work just
fine) and crated an application. The application has a list on the
left with projects and a tab view on the right. In the tab view, you
can switch to different views to add versions and bugs. I have just
been adding data to the versions and bugs though a table view, but
want to have a window pop up and enter the values. I have no problem
with popping up the window, etc, but I am stuck on saving the data..
This is my current code:

NSManagedObjectContext * context = [[NSApp delegate]
managedObjectContext];
NSManagedObject * version = nil;

version = [NSEntityDescription
insertNewObjectForEntityForName:@"BCVersions"
inManagedObjectContext:context];

[version setValue:[newVersion stringValue]
forKeyPath:@"product_version"];

My only problem is that it is not saving to the relationship it has
with BCProducts. I thought this would happen automatically, but I
guess it doesn't? The data does add, but without the relationship of
corse. I have read several documents from apple about Core Data and
can't find my answer. I bet it is staring at me somewhere close, but
I don't see it...

Anyway, I appreciate any help going in the right direction!

Thanks,

Matt D

[Mike Thole]

The code you have will add the new 'BCVersions' entity into the managed object context, but it won't set up any of the relationships for you. You need to get at the NSManagedObject representing your selected 'BCProduct'. Then call setValue:forKey: on it with your new 'BCVersions' object.

Here 'selectedProduct' is the NSManagedObject for the 'BCProduct' that you're editing:

[selectedProduct setValue:version forKey:@"version"];

I'd recommend trying to work through a good Core Data tutorial to give you a better understanding of how the relationships work and how to best design your managed object model. Core Data is very powerful, so don't give up on it.