Re: Can CoreData return only unique results of an attribute
Re: Can CoreData return only unique results of an attribute
- Subject: Re: Can CoreData return only unique results of an attribute
- From: Philip Bridson <email@hidden>
- Date: Tue, 26 Feb 2008 23:03:36 +0000
Yeah there is.
From the documentation:
You can set a predicate for an array controller to filter the content
array. You can set the predicate in code (using setFilterPredicate:).
You can also bind the array controller's filterPredicate binding to a
method that returns an NSPredicate object. The object that implements
the method may be the File's Owner or another controller object. If
you change the predicate, remember that you must do so in a key-value
observing compliant way (see Key-Value Observing Programming Guide)
so that the array controller updates itself accordingly.
You can also bind the predicate binding of an NSSearchField object to
the filterPredicate of an array controller. A search field's
predicate binding is a multivalue binding, described in Binding Types.
Or simply, create a small method in a object, such as the file owner,
that returns a NSPredicate. Then bind the controller's filter
predicate to the file owners predicate method. This will
automatically filter your controllers values.
Hope this helps.
Phil.
On 26 Feb 2008, at 22:00, Adam Gerson wrote:
I have a core data object. I would like to populate a TableView with
only the unique entires for a specific property. Clearly I could
filter the results in code, I was wondering if there was away for core
data and bindings to do it.
Adam
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