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原數(shù)據(jù)為：

{
    "_id" : NumberLong(1181675746),
    "shard_qty" : 4,
    "goods_qty" : 0,
    "shop_qty" : 0,
    "favorite_qty" : 4,
    "favorite_shards" : [ 
      {
            "sid" : NumberLong(580),
            "favorite_dt" : ISODate("2015-06-26T12:13:06.405+08:00"),
            "is_attention" : true
        }, 
      {
            "sid" : NumberLong(579),
            "favorite_dt" : ISODate("2015-06-26T12:13:06.405+08:00"),
            "is_attention" : true
        }, 
        {
            "sid" : NumberLong(578),
            "favorite_dt" : ISODate("2015-06-26T12:13:06.405+08:00"),
            "is_attention" : true
        }, 
        {
            "sid" : NumberLong(577),
            "favorite_dt" : ISODate("2015-06-26T13:20:48.449+08:00"),
            "is_attention" : true
        }
    ]
}

查詢條件為

db.getCollection('web_mem_favorites').findOne(
    {
    '_id':NumberLong(1181675746),
    'favorite_shards.sid': {
        '$in':[NumberLong(577),NumberLong(578)]
        }
    }
    ,{"favorite_shards":1}
)

想返回的數(shù)據(jù)：

{
    "_id" : NumberLong(1181675746),
    "favorite_shards" : [ 
      {
            "sid" : NumberLong(578),
            "favorite_dt" : ISODate("2015-06-26T12:13:06.405+08:00"),
            "is_attention" : true
        }, 
        {
            "sid" : NumberLong(577),
            "favorite_dt" : ISODate("2015-06-26T13:20:48.449+08:00"),
            "is_attention" : true
        }
    ]
}