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当我运行此查询到Rails控制台:mongoid类型错误:密钥必须是字符串或符号
1.9.3p286 :118 > cs = Conference.any_of({:schedule_cache => { :$elemMatch => { :start_date.gte => Date.parse('7 Mar 2013'), :end_date.lte => Date.parse('8 Mar 2013')}}})
1.9.3p286 :118 > cs.count
我得到:
TypeError: keys must be strings or symbols