使用正則表達式從文檔中的給定字段中刪除子字符串，並在 mongo 中在其前面添加另一個子字符串

Question

在下面給出的給定 mongo 文檔中，如果用戶想從“用戶名”字段中刪除“用戶”並希望將其替換為“管理員”，以便所有用戶值更改為 [“Admin1”、“Admin2”]

舊文件：

/* 1 */ { "_id": "Alice", "name": "Test1", "username": "user1", "role": "Admin", "password": "04f8996da763b7a969b102" }

/* 2 */ { "_id": "John", "name": "Test", "username": "user2", "role": "Admin", "password": "8c6976e5b5410415bde908bd" }

更新后的預期文件：

/* 1 */ { "_id": "Alice", "name": "Test1", "username": "Admin1", "role": "Admin", "password": "04f8996da763b7a969b102" }

/* 2 */ { "_id": "John", "name": "Test", "username": "Admin2", "role": "Admin", "password": "8c6976e5b5410415bde908bd" }

Answer 1

db.getCollection('users').find({"role": "Admin"}).forEach(function(doc) { doc["username"] = doc["username"].replace(/.*user/ , ''); db.getCollection('users').update({_id:doc._id}, {$set:{"username":"Admin" + doc["username"]}})
});