From: Ezra Zygmuntowicz <ezmobius@...>
Date: 2006-11-05T04:26:58+09:00
Subject: Re: Accessing instance vars in a block?


On Nov 4, 2006, at 11:24 AM, Joe Ruby MUDCRAP-CE wrote:

> I'm using rmagick:
>
>   img.write(self.path) { self.quality = @quality }
>
> @quality is nil inside the block. How can I access its value inside  
> the
> block? I saw there's apparently a "variable" keyword, but that  
> causes an
> error:
>
>   img.write(self.path) {
>     variable @quality
>     self.quality = @quality
>   }
>
> Thanks,
> Joe


	It looks like maybe ImageMagick is using instance_eval inside that  
block. This is why the @instance vars don't work inside of there. The  
ugly workaround is to use local variables:

quality = @quality
  img.write(self.path) { self.quality = quality }

Cheers

-- Ezra Zygmuntowicz 
-- Lead Rails Evangelist
-- ez@engineyard.com
-- Engine Yard, Serious Rails Hosting
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