mongodb 更新數組出現can't append to array using string field name

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資料庫內容大概如下：

{_id:1,"hero_list" : {                "15521" : {                        "stars" : 0,                        "_id" : 15521,                        "equip" : [                                [ ],                                [ ],                                [ ],                                {                                        "item_id" : 310141,                                        "lv" : 103,                                        "uuid" : "4a727ee1-e7b0-4265-b004-e2b75890378a",                                        "amount" : 1                                },                                [ ],                                [ ]                        ],                        "lv" : 15,                        "exp" : 0,                        "quality" : 0                }            }}

> db.hero.update({_id:1},{$set:{"hero_list.15521.equip.4.lv":1}})
can‘t append to array using string field name [lv]

看了半天，原來是自己眼花，數組下標數錯了

db.hero.update({_id:1},{$set:{"hero_list.15521.equip.3.lv":1}})

OK

mongodb 更新數組出現can't append to array using string field name