Ruby on rails Rails 3参数错误：未知键：开始日期

我有一个拥有许多会员资格的

豁免

对象。我想弄清楚豁免是否有某一季度的会员资格：

def has_current_membership?
  memberships.count("begin_date >= :begin_date AND end_date <= :end_date", { :begin_date => Time.now.beginning_of_quarter, :end_date => Time.now.end_of_quarter }).count > 0
end

---

我做错了什么？

您应该使用

.where

作为查找条件，而不是

。计数两次：

memberships.where("begin_date >= :begin_date AND end_date <= :end_date", { :begin_date => Time.now.beginning_of_quarter, :end_date => Time.now.end_of_quarter }).count > 0

会员资格。其中（“开始日期>=：开始日期和结束日期
memberships.where("begin_date >= :begin_date AND end_date <= :end_date", { :begin_date => Time.now.beginning_of_quarter, :end_date => Time.now.end_of_quarter }).count > 0