Re: Accessing elements of an Array using a flat Key
Re: Accessing elements of an Array using a flat Key
- Subject: Re: Accessing elements of an Array using a flat Key
- From: Jonathan Rochkind <email@hidden>
- Date: Mon, 16 Feb 2004 10:39:23 -0600
There's a step in between "by hand" and using EOSortOrdering. If
EOSortOrdering won't do what you need to do, see NSComparator. Which
provides a very flexible method of sorting, using a built-in sorting
method that you don't need to write yourself (see
NSArray.sortedArrayUsingComparator), but, if neccesary, providing
your own NSComparator implementation to define how to tell if an
object is "greater than" another object or not.
--Jonathan
At 2:29 AM -0500 2/15/04, Alex Eiser wrote:
Hi,
This is probably a dead end, but I wanted to check anyway.
I am working on an application to handle course enrollments and marks.
One of the key features needs to be to sort a class by marks achieved.
Out database structure is done so that each course can have a varying
number of mark items. Since we want to be able to sort the class by any
mark item this presents a problem.
In most cases I perform my sorting by using
"EOSortOrdering.sortArrayUsingKeyOrderArray(enrollList,
sortOrderings);" were sortOrderings is defined using
"EOSortOrdering.sortOrderingWithKey(aKey, aSelector);" The problem is
I need to be able to specify a key which specifies which entry of the
mark items is to be used.
Since their are many markItems for a single student I can't just use
the relationship.
Is there any way to specify a specific item of a 1-many relationship?
Or do i need to perform the sorting by hand?
Thanks,
Alex
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