From: Brian Candler <b.candler@...>
Date: 2009-01-29T04:06:59+09:00
Subject: Re: Defining an ActiveRecord class within a method of another class

Glenn wrote:
> Hi,
> 
> I want to create a class and define a subclass of ActiveRecord within 
> that class, like this:
> 
> class Results
>   def initialize(db)
>     class db < ActiveRecord::Base
>     end
>   end
> end
> 
> r1 = Results.new('DM')
> r2 = Results.new('AE')

Class.new(superclass) should do what you need without need to eval 
anything. This gives you an anonymous class, which you can then assign 
to a constant to give it a proper class name. Something like (untested):

class Results
  def initialize(name)
    @klass = Results.const_set(name, Class.new(ActiveRecord::Base))
  end
  def query
    @klass.find(...)
  end
end

r1 = Results.new('DM')
Results::DM.find(...)
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