Question

I ve got a window set up with two NSTableViews. In Core Data I have two entities set up, one of them containing members of the other, larger grouping (e.g. cars and manufacturers). I ve got entry pages set up for each entity and they play nicely there (no faulting when trying to select from a many-to-one in a drop menu). What I m trying to do now is take that one step further so that when I select a manufacturer in the main NSTableView, the list of cars related to that manufacuturer will appear in the second NSTableView.

I ve tried using bindings similar to what I ve done for the manufacturer popup button, feeding the value from the cars entity, however it s simply showing a list of all the car entries, regardless of which manufacturer I select. I don t see any options for a predicate to filter it, however, and if I set the binding s key path to manufacturer.cars, it shows a relationship fault. How can I filter what gets displayed in the child table?

Answer 1

Have two NSArrayControllers. Bind the contentArray of the cars controller to the manufacturers controller; the controller key is selection (i.e., the selected manufacturer), and the model key path is that of the property containing the manufacturer s cars.

Then, bind the cars table view s columns to properties of the cars controller s arrangedObjects.

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