I am using a NSArrayController which has a Managed Object Context to present data of a CoreData source in a NSTableView. Everything works fine, I can also use filterPredicate to filter my results which also reflect in the NSTableView. For example

coreDataArrayController.filterPredicate = NSPredicate(format: "dataType == %@","live_data")

shows only the rows with this specific value "live_data" in the "dataType" attribute.

I do have some binary data in the CoreData database which I can parse using custom functions. Is there a way I can filter using this information too? For example I have an attribute "binary_data" which contains binary representation of a NSImage. I now want to check the image type of this NSImage and use this information to filter my dataset.

Something like:

coreDataArrayController.filterPredicate = NSPredicate(format: "imageType(binary_data) == %@,"png")

To show only rows that contain an image in "binary_data" that is a png (which is checked by my custom function "imageType"