[MacRuby-devel] rubyfying Cocoa iterators

[Matt Aimonetti]

you could also create a module and mix it in with the objects you want have
the custom methods defined in.

- Matt

On Thu, Nov 17, 2011 at 3:21 PM, Kam Dahlin <haxie1 at me.com> wrote:

> If you didn't want to use a category, you could do:
>
> orderedSet = NSOrderedSet.orderedSetWithArray(["1", "2", "3"])
> orderedSet.class.send(:define_method, :each) do
>   self.array.each do |item|
>       yield item
>   end
> end
>
> orderedSet.each do |item|
>    puts item
> end
>
> This method also has the advantage of capturing local scope, if needed.
>
> hth
> kam
>
> On Nov 17, 2011, at 8:22 AM, techzen wrote:
>
> > The Cbjective-C way to handle this would be to put a category that
> provided an `each` method on NSOrderedSet. Then when you called `each` it
> would just work. Ruby has a similar functionality but I can't remember
> right now what it's called.
> >
> > Using a category would be optimal in the case of Core Data because in
> some instances you can actually evoke a method as part of a key path when
> sending Key-Value messages.
> >
> > Shannon
> >
> > On Nov 16, 2011, at 4:11 AM, Jean-Denis MUYS wrote:
> >
> >> I have this ordered Core Data to-many relation named "operations" that
> I want to iterate over. I wrote:
> >>
> >>   self.operations.each { | operation | operation.doSomething }
> >>
> >> However this fails because self.operations returns an NSOrderedSet and
> NSOrderedSet doesn't have an 'each' method.
> >>
> >> I was able to use the 'enumerateObjectsUsingBlock' method of
> NSOrderedSet which is working fine.
> >>
> >> My question is: what would be the MacRuby way to add an 'each' method
> to NSOrderedSet?
> >>
> >> Thanks,
> >>
> >> Jean-Denis
> >>
> >>
> >>
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> >
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>
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