Re: NSArrayController & NSTreeController default sort order
Re: NSArrayController & NSTreeController default sort order
- Subject: Re: NSArrayController & NSTreeController default sort order
- From: Chris Schmitt <email@hidden>
- Date: Tue, 22 Jan 2008 14:52:27 -0500
I understand what you are saying about the objects in the controller
not being sorted, but I am confused on why I would need a separate
entity to have my sort order stored correctly. If I could retrieve
the data using that "sortOrder" attribute, why couldn't I just use any
of the entity attributes to retrieve the sorted objects?
Also after reading the posts, I wonder if it would make more sense to
set a default sort order on the tree's and tables that are using the
data instead of handling it in the controller. Is this the
"preferred" way to show the data with a default sort order?
Thanks again for all the help.
On Jan 22, 2008, at 2:09 PM, I. Savant wrote:
On Jan 22, 2008 2:06 PM, I. Savant <email@hidden> wrote:
How do I set up the bindings correct
so my controllers fetch the data pre-sorted?
Subclass your controller and override -arrangeObjects:.
Um ... or, you could use the controller's -setSortDescriptors:
method or its sortDescriptors binding since they're there for just
that purpose.
Addendum: Of course if you're using Core Data, you need to be aware
that there's no pre-determined order in which you'll receive members
of a fetch (which is the case with your controller). You'd need to add
a sortable attribute to your entity like, "sortOrder" and assign each
instance a sane value. You'd use that key when setting your
controller's sort descriptors.
--
I.S.
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