查询Ruby Active记录对象

Question

我的代码就是这个

users = UserLocation.find(:all, :conditions => "hide_my_location = 0 and datediff(now(), updated_at) < 2 and id != 196")
near_users = users.find(:all, :conditions => "substr(geohash, 1, 11) = 'abcdef'")
count = near_users.count

它在ruby 1.8.7中返回错误

错误的参数数量（2为1） Rails 2.3.6 ** activerecord（2.3.6）