Is it possible to bind a `NSTextfield` to only one particular entry in a NSArray or NSSet/ Relationship

Question

Is it possible to bind a NSTextfield to only one particular entry in a NSArray or NSSet/ Relationship.

I can see the possibility of binding to an NSArrayController using the Control Key of filterPredicate but what would be the Model Key Path?

Further, can a single NSArrayController have many filterPredicates either methods or properties.

Answer 1

As far as I know, you cannot bind to a specific object in a set because there is no way to consistently express a given object within the set. The only method for extracting an object from a set is anyObject. For arrays its another matter. They can be indexed them and the bindings API allows you to do this:

// Edit: changed the code to use bindings directly instead of KVO

[_textFild bind:NSValueBinding 
       toObject:array[indexToBindTo]
    withKeyPath:@"firstName"
        options:nil];

You can't do this directly in Interface Builder so it has to be done in code.