我有数据库的数据结构（model : Record）：

{
    "_id": {
        "$oid": "5141ae831229bc11b0000001"
    },
    "attend_date": "2013-03-14",
    "checkins": [
        {
            "_id": {
                "$oid": "5141ae831229bc11b0000002"
            },
            "check_unit_id": {
                "$oid": "5138ae3b1229bcc4d800000b"
            },
            "behave_id": {
                "$oid": "5138ae3b1229bcc4d8000001"
            }
        },
        {
            "_id": {
                "$oid": "5141ae831229bc11b0000003"
            },
            "check_unit_id": {
                "$oid": "5138ae3b1229bcc4d800000c"
            },
            "behave_id": {
                "$oid": "5138ae3b1229bcc4d8000001"
            }
        }
    ],
    "created_at": {
        "$date": "2013-03-14T11:03:31.819Z"
    },
    "record_person": "廖玥",
    "record_zone": "4028809b3c6fbaa7013c6fbc39900382",
    "staffid": "4028809b3c6fbaa7013c6fbc3da51b3d",
    "state": "checking",
    "updated_at": {
        "$date": "2013-03-14T11:03:31.819Z"
    }
}

我想通过类似查询语句： Record.where(state:"checking").where(checkins.behave_id: "...." ),形式 筛选出想要的 records, 我的这个查询语句该怎么写呢？求指教。