generate named_scopes for each column

gistfile1.rb

# coding: utf-8
module Searchable
  def search(params={})
    return self.scoped if params.nil?
    params.reject{|k,v|v.blank?}.to_a.inject(self) do |base,param|
      base.send(param.first, param.last)
    end
  end

  def self.extended(base)
    base.column_names.each do |column_name|
      base.class_eval %Q{
        named_scope :#{column_name}, lambda { |val| {
          :conditions => { :#{column_name} => val }
        }}
      }
    end
  end
end