• Open Menu Close Menu
  • Apple
  • Shopping Bag
  • Apple
  • Mac
  • iPad
  • iPhone
  • Watch
  • TV
  • Music
  • Support
  • Search apple.com
  • Shopping Bag
 

Lists

Open Menu Close Menu
  • Terms and Conditions
  • Lists hosted on this site
  • Email the Postmaster
  • Tips for posting to public mailing lists
KeyValuePair entity concept and bindings
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

KeyValuePair entity concept and bindings


  • Subject: KeyValuePair entity concept and bindings
  • From: Aaron Tuller <email@hidden>
  • Date: Sat, 15 Apr 2006 13:31:16 -0700

I'm implementing something similar to the idea Bill Bumgarner described here:

http://www.cocoabuilder.com/archive/message/cocoa/2005/4/30/134246

using a KeyValuePair entity to model user-defined fields.

So in the example of the message, let's say i have a table view of my Paper objects, and i want to bind a table column to one of the keys in KeyValuePair, what's the best way to do this?

I was imagining a value transformer, which works, if the binding is read only, but if it's not how can I push the change back to the managed object? which key do i want to bind to and then transform, the NSSet (the to-many relationship of KeyValuePairs) or the NSManagedObject itself?

I can't add custom setters because the fields are defined by the user, and I can't override setValue:forKey: to handle these custom keys because that is not allowed per the NSManagedObject docs.

Here's the very simple model I'm working with now:

Paper <->> KeyValuePair

Thanks for any input.

-aaron
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Cocoa-dev mailing list      (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden


  • Prev by Date: Re: NSValueTransformer vs. NSFormatter
  • Next by Date: Adjusting appearance of a valid dragDestination (was:Adjusting appearance of dragImage)
  • Previous by thread: Re: NSValueTransformer vs. NSFormatter
  • Next by thread: Adjusting appearance of a valid dragDestination (was:Adjusting appearance of dragImage)
  • Index(es):
    • Date
    • Thread