# File lib/meta_search/where.rb, line 102
    def evaluate(relation, attributes, param)
      if splat_param?
        conditions = attributes.map {|a| a.send(predicate, *format_param(param))}
      else
        conditions = attributes.map {|a| a.send(predicate, format_param(param))}
      end

      relation.where(conditions.inject(nil) {|memo, c| memo ? memo.or(c) : c})
    end