rails mongodb where in array -


i'm trying positive_power_values it's meter_id in array 

 1.9.3p194 :100 > ppv = positivepowervalue.first
  
   
positivepowervalue _id: 518dfd25a81fc61ece8d3d23, _type: nil, deleted_at: nil, created_at: "2013-05-11 19:04:54 +0800", updated_at: nil, positive_active_energy_power_indication: "100.00", positive_reactive_power_indication: "50", use_flag: "true", meter_id: "4f71181b6e92fe054b000006"    1.9.3p194 :101 > positivepowervalue.where(:meter_id.in => ["4f71181b6e92fe054b000006"]).count    => 0

i wender why 0? need positive_power_values meter_id in array!

are using mongoid ?

the proper syntax :

positivepowervalue.in(:meter_id => ["4f71181b6e92fe054b000006"])

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