无法更新MongoDB数组值数组

Question

这与我之前的问题How to update mongodb array values

有些相似

"Fiction" : [
           {
                   "SNo": "1",
                   "authorName" : "Enid Blyton",
                   "bookSeries" : "Secret Seven series",
                   "bookName" : [{"Title": "Secret Seven Adeventure", "Amount": 115},
                                 {"Title": "Well done Secret Seven", "Amount": 135}]

           },
           {
                   "SNo": "2",
                   "authorName" : "Enid Blyton",
                   "bookSeries" : "Mystery series",
                   "bookName" : [{"Title": "Burnt Cottage", "Amount": 150},
                                 {"Title": "Vanished Prince", "Amount": 140}]
           }
   ]

我希望将Amount: 115更新为Amount: 135。

从解决方案到早期的问题，我通过做这样的事情来尝试它

db.Fiction.update({"Fiction.SNo": "1","Fiction.bookName.$.Title": "Secret Seven Adeventure"},{$set:{"Fiction.bookName.$.Amount": 135}})

但我得到了WriteResult({ "nMatched" : 0, "nUpserted" : 0, "nModified" : 0 })

任何人都可以告诉我为什么会这样吗

修改

建议的答案仅在数组的索引已知时才有效。

但在我的情况下，数组的index是未知的。