From: Jamey Cribbs <jcribbs@...>
Date: 2007-12-13T06:58:01+09:00
Subject: Re: Turning symbols into class names

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Rails has something even easier:

:foo.to_s.constantize  -> Foo



On Dec 12, 2007 4:39 PM, Samantha <rubygeekgirl@gmail.com> wrote:

>
>
> On Dec 12, 4:26 pm, Sebastian Hungerecker <sep...@googlemail.com>
> wrote:
> > Samantha wrote:
> > > Now, I need to do the same thing for those symbols... however, I need
> > > to somehow get Ruby to recognize those symbols as Classes.
> >
> > Nitpick: You need ruby to give you the class with a certain name. You
> don't
> > need ruby to "recognize" the symbols as something they're not.
>
> Semantics, semantics, semantics. :)
>
> > > So, let's say in my array, I have a symbol by the name of :foos, that
> /
> > > should/ correspond with the Foo class.
> >
> > > So...
> >
> > > array looks like: [:foos, :bars]
> >
> > > I need to be able to do something along the lines of:
> >
> > > array[0].to_s.capitalize.singularize.my_method_to_grab_associations
> >
> > > Well, obviously that will give me Foo, but it thinks Foo is a string.
> >
> > You make it sound as if ruby was wrong in thinking so. "Foo" *is* a
> string.
>
> Oh, I know that "Foo" is a string.  I just needed a way to turn that
> string into something else. :)  Of course if anyone is wrong, it's me,
> and not Ruby - I've just been working on something for a long amount
> of time which has my 'grr' factor raised a lil bit. :)
>
> > > Which leads me to my question -
> > > How do I get my method to give me back what I'm looking for on Foo,
> > > rather than complaining that Foo is a string?
> >
> > By passing the string to const_get, which will return the value of the
> > constant with the name "Foo" and then calling your methods on that value
> > (which will be the class object if Foo is a class).
> > [:foos, :bars].map {|name| Object.const_get(
> name.to_s.capitalize.singularize)}
> > should return [Foo, Bar], Foo and Bar being class objects.
>
> Thank you, Sebastian!  That did *exactly* what I needed, which is why
> after banging my head incessantly on this for a while now, I decided
> to come here - where those who know much, much more than I, reside.
>
> -Samantha
>
> > HTH,
> > Sebastian
> > --
> > NP: In Flames - Dead Eternity
> > Jabber: sep...@jabber.org
> > ICQ: 205544826
>
>
>

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