From: Eero Saynatkari <ruby-forum-reg@...>
Date: 2005-12-15T07:19:07+09:00
Subject: Re: Getting Object From String?

Hunter's Lists wrote:
> Howdy,
> 
> I have a class called 'NewsItem'.
> 
> In one of my Rails classes, I have a place to pass in a string (from a 
> HTTP
> parameter). That string's value is 'NewsItem', the class name.
> 
> How can I convert that to use as the class?
> 
> I.e.
> 
> @model = params[:modelname]
> @items = @model.find(:all)
> 
> This doesn't work. I was hoping it would work the same way as:
> @items = NewsItem.find(:all)
> 
> How can I pull this off?

# This takes into account nested class names
@model = params[:modelname].split('::').inject(Object) {|parent, klass| 
parent.const_get klass}

> Thanks!


E

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