From: Brian Candler <b.candler@...>
Date: 2010-04-27T21:01:10+09:00
Subject: Re: RUBY  EVAL   FUNCTION

It's pretty reasonable to use eval in the code you provide. I think the 
method it defines will be faster because there is no closure created.

But if you really want to avoid it:

class Module
  def attr_finder(*syms)
    syms.each do |sym|
      define_method(sym) do |*args|
        val = instance_variable_get("@#{sym}")
        return val if args.empty?
        hash = args.first
        val.find_all do |t|
          found = true
          hash.each_key { |key|
            found = false if t.send(key) != hash[key]
          }
          found
        end
      end
    end
  end
end

# Test
class Foo
  attr_finder :bar
end

f = Foo.new
f.instance_eval { @bar = ["a","bb","cc"] }
puts f.bar
puts f.bar(:length => 2)

I would also be inclined to simplify your finder loop to this:

        hash = args.first
        val.find_all { |t| !hash.find { |k,v| t.send(k) != v } }
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