Sorting problems with NSArrayController and a value transformer
Sorting problems with NSArrayController and a value transformer
- Subject: Sorting problems with NSArrayController and a value transformer
- From: Tom Birch <email@hidden>
- Date: Tue, 10 May 2005 15:57:45 +1000
I have a master-detail view with a table view and some text fields to
display the current selection, all bound to an array controller, with
its content object class set to a custom class (Record) that has an
NSMutableDictionary instance variable (dict) and and some other
methods for actions, etc.
I'm populating the managed array with NSMetadataQuery, and
implementing the delegate method
(metadataQuery:replacementObjectForResultObject:) to return a Record
object populated with some of the attributes from the query
(particularly kMDItemTitle, kMDItemFSCreationDate and
kMDItemAuthors). For the column and the NSTextField that represent
the date, I have attached an NSDateFormatter which works fine, and
allows sorting. For the authors column and text field, I have used a
value transformer to convert the array of strings to a comma-
separated string, and the reverse operation for storing back in a
Record.
When I try to sort by either the Name or Date columns, it works fine,
but when I try to sort by the Authors column, I get this error:
2005-05-10 12:09:57.762 MyApp[4597] *** -[NSCFArray compare:]:
selector not recognized [self = 0x4d9c5c0]
debugging shows that self is an array containing strings, and I also
discovered that each array for the Author key contains only
It appears that the value transformer is not getting called for
sorting (I actually verified this by putting an NSLog() statement
inside my formatter), even though I have checked "creates sort
descriptor" in the binding option for the column where I set the
value transformer.
Basically, what am I doing wrong? My formatter is working correctly
because I've tested it both ways, and I've double-checked the binding
to make sure it's set to create the sort descriptor, I feel like
there's some crucial step that I'm missing.
cheers,
Tom
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