Rails - Jan 2010 - want to combine two searches into one

I would like to merge this method from a controller into a separate
model, called search.

class DudesController < ApplicationController
 def search
    @address = params[:address]
    @within  = params[:within]

    @dudes = Restaurant.find :all,
                       :origin => @address,
                       :within => @within,
                       :order => ''distance''

    respond_to do |format|
      format.html # index.html.erb
      format.xml  { render :xml => @restaurants }
    end
  end


This is the search model:

class Search < ActiveRecord::Base
   acts_as_mappable :auto_geocode => true
validates_numericality_of :minimum_age, :maximum_age, :allow_nil => true


def dudes
  @dudes ||= find_dudes
end

private


def find_dudes
  Dude.find(:all, :conditions => conditions)
end

def minimum_age_conditions
  ["dudes.birthdate <= ?", Date.today - minimum_age.years] unless
minimum_age.blank?
end

def maximum_age_conditions
   ["dudes.birthdate >= ?", Date.tomorrow  - (maximum_age+1).years]
unless maximum_age.blank?
end

def category_conditions
  ["dudes.category_id = ?", category_id] unless category_id.blank?
end

def conditions
  [conditions_clauses.join('' AND ''), *conditions_options]
end

def conditions_clauses
  conditions_parts.map { |condition| condition.first }
end

def conditions_options
  conditions_parts.map { |condition| condition[1..-1] }.flatten
end

def conditions_parts
  private_methods(false).grep(/_conditions$/).map { |m| send(m)
}.compact
end


end

I assume I would write something like

def location_conditions

end


I don''t know how to get the dude.address into a location_conditions
method.  The search controller is a simple scaffold with the search
using the create method.
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