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當我運行此查詢到Rails控制檯:mongoid類型錯誤:密鑰必須是字符串或符號
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