mongodb 中的嵌套数组更新

我有一个集合，其结构是:-

I have collection the structure of which is :-

Subscribed.insert({
    "name":  "Manager1",
    "emailId": "arora.priya4172@gmail.com",
    "category": "Finance",
    "designation": 'Head',
    "done": false,
    "categorySubscribedUsers": [
        {
            "_id": "u4._id",
            "username": "u4.profile.name",
            "issuesNotToDisplay": []
        },
        {
            "_id": "u4._id",
            "username": "u4.profile.name",
            "issuesNotToDisplay": []
        },
        {
            "_id": "u4._id",
            "username": "u4.profile.name",
            "issuesNotToDisplay": []
        }
    ]
});

我想在 issuesNotToDisplay 字段中插入一个字段.因此，为此我使用以下命令但出现错误:

I want to insert a field in issuesNotToDisplay field. So, for this I am using the following command but getting error:

'syntax error: missing : after property id' in browser console 和'syntax error missing token .'

'syntax error: missing : after property id' in browser console and 'syntax error missing token .'

在 mongodb 控制台中.

In the mongodb console.

谁能告诉我在 mongodb 中更新双重嵌套数组中的字段的正确命令应该是什么.我尝试了很多，也读过书，但仍然一无所知.为什么这个命令会报错?

Can anyone please tell me what should be the proper command for updating a field in doubly nested array in mongodb. I have tried a lot and read book too but still clueless. Why this command is giving error?

命令是:-

db.subscribed.update(
    {
        "category": "Finance",
        "categorySubscribedUsers": "priya"
    },
    { 
        "$addToSet": {
            "categorySubscribedUsers.$.issueNotToDisplay": "25PEgZoMamLSTDdw7"
        }
    }
);