MongoDBの "student id"と "homework"と比較して、スコアを最小にするにはどうすればよいですか？

Question

type: homework and student_idを使用して最小スコアを削除したいと考えています。例については 、 student_id :0は、2つの値がタイプすなわち持っている：宿題 を、私は削除する少なくとも1すなわち

{ "_id" : { "$oid" : "50906d7fa3c412bb040eb579" }, "student_id" : 0, "type" : "homework", "score" : 14.8504576811645 } 

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マイファイル：

{ "_id" : { "$oid" : "50906d7fa3c412bb040eb577" }, "student_id" : 0, "type" : "exam", "score" : 54.6535436362647 } 
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb578" }, "student_id" : 0, "type" : "quiz", "score" : 31.95004496742112 } 
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb579" }, "student_id" : 0, "type" : "homework", "score" : 14.8504576811645 } 
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb57a" }, "student_id" : 0, "type" : "homework", "score" : 63.98402553675503 } 
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb57b" }, "student_id" : 1, "type" : "exam", "score" : 74.20010837299897 } 
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb57c" }, "student_id" : 1, "type" : "quiz", "score" : 96.76851542258362 } 
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb57d" }, "student_id" : 1, "type" : "homework", "score" : 21.33260810416115 } 
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb57e" }, "student_id" : 1, "type" : "homework", "score" : 44.31667452616328 } 
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb57f" }, "student_id" : 2, "type" : "exam", "score" : 19.88180838833524 } 
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb580" }, "student_id" : 2, "type" : "quiz", "score" : 1.528220212203968 } 
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb581" }, "student_id" : 2, "type" : "homework", "score" : 60.9750047106029 } 
{ "_id" : { "$oid" : "50906d7fa3c412bb040eb582" }, "student_id" : 2, "type" : "homework", "score" : 97.75889721343528 } 

Answer 1

このクエリを試してみてください

db.getCollection('collectionName').find({ 
    "student_id": 0, 
    "type": "homework" 
}).sort({ 
    "score": 1 
}).limit(1). 
forEach(function(data) { 

    db.getCollection('home').remove({ 
     _id: data._id 
    }) 
})