From: Shadowfirebird <shadowfirebird@...>
Date: 2008-08-13T01:15:50+09:00
Subject: Re: What's the easiest way to check if param[:x][:y] exists?

It looks to me as if you should be able to check for nil.

foo( param[:x][:y] ) unless (param[:x][:y] == nil)

On Tue, Aug 12, 2008 at 5:03 PM, Joshua Muheim <forum@josh.ch> wrote:
> Hi all
>
> In PHP I can simply check whether $param['x']['y'] exists regardless
> whether $param['x'] exists or not.
> In Rails I get a NoMethodError when using
>
> if param[:x][:y]
>  ..
> end
>
> when param[:x] is nil. So I always have to use
>
> if param[:x] and param[:x][:y]
>  ..
> end
>
> but I think that's not very beautiful - think about a case where I have
> to check whether param[:a][:b][:c][:d][:...] exists or not!
>
> Maybe there's a cooler way to do this? ;-)
>
> Thanks
> Josh
> --
> Posted via http://www.ruby-forum.com/.
>
>



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