如何在 MongoDB 中创建自定义 ID

Question

I want to create a custom id in MongoDB.

Example- suppose I have a user document and in which the custom id should contain, first two letters of country code then after that two letters of state code then a random unique number.

Example: suppose the user is from India and the state is delhi so the id should look like this - INDL123

I am using NodeJS.

Answer 1

You can create a property in your Schema named CustomID or whatever you want to name it and make it of type string , then you can use the function below to Generate the CustomID based on country,city passed.

This is just a quick example and can be improved a lot

 let country = 'India' let city = 'Delhi' function CreateCustomID(country, city) { return `${country.slice(0, 2).toUpperCase()}${city.slice(0,2).toUpperCase()}${Math.floor(Math.random()*(999-100+1)+100)}` } console.log(CreateCustomID(country, city))