From: Sjoerd Andringa <andringa@...>
Date: 2008-10-19T19:04:32+09:00
Subject: Re: Using a result as a constant object?

If the ActiveRecord model already exists you can just call constantize 
on the string containing the model name:

class SomeModel < ActiveRecord::Base; end

model_name = "SomeModel" # or in your case fetch this from a database
ar_model = model_name.constantize
ar.model.find(120)
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