Rails Model Searchable Superclass

searchable.rb

#a quick whipped full-text search superclass to help make queries appear out of nowhere for fun and profit
# if you're reading this thinking 'why?' you are right and you should probably just replace this paradigm
# with actual logic D:

class Searchable < ActiveRecord::Base
  class << self
    @@searches_on = {}
    def searches_on *fields
      cls = self.to_s.to_sym

      unless @@searches_on.include? cls
        @@searches_on[cls] = []
      end

      @@searches_on[cls] << fields
      @@searches_on[cls].flatten!
    end

    def search search, limit = nil
      where = '0'
      like = '%' + search.gsub(' ','%') + '%'
      @@searches_on[self.to_s.to_sym].each do |field|
        field = field.to_s

        unless self.columns_hash.include? field
          raise NameError, "#{field} is not a valid column on #{self}"
        end

        if [:integer, :decimal, :float].include? self.columns_hash[ field.to_s ].type
          where += ' or ' + self.arel_table[field].eq( search ).to_sql
        else
          where += ' or ' + self.arel_table[field].matches( like ).to_sql
        end
      end

      if limit.nil?
        self.where( where )
      else
        self.where( where ).limit( limit )
      end
    end
  end
end