MongoDB auto-generated id with spring boot

In this project we are going to see how we can auto generate id in mongo db with spring boot.

we are going to create a simple spring boot project with mongodb.

Dependencies

add the following dependencies in your spring boot application’s pom.xml

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>

Project structure

let’s create our model class. inside this class make your id data type String otherwise, you can’t auto-generate id with MongoDB irectly

Data.java

package com.gangforcode.autoId.mode;
import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;

@Document(collation = "data")
public class Data {

    @Id
    private String id;
    private String name;


    public Data(String id, String name) {
        this.id = id;
        this.name = name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public Data() {
    }
}

Here @Id will autogenerate values only for the string field but it will not auto increment values.

now create a repository interface by extending MongoRepository

RepositoryMongo.java

package com.gangforcode.autoId.repo;

import com.gangforcode.autoId.mode.Data;
import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface RepositoryMongo extends MongoRepository<Data,String> {
}

time for creating controller class , inside controller auto wire mongoRepo

controllerMongo.java

package com.gangforcode.autoId.controller;

import com.gangforcode.autoId.mode.Data;
import com.gangforcode.autoId.repo.RepositoryMongo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;

@Controller
public class controllerMongo {
    @Autowired
    RepositoryMongo repo;

    @PostMapping("/reg")
    public ResponseEntity<?> reg(@RequestBody Data data)
    {
        return new ResponseEntity<>(repo.save(data), HttpStatus.CREATED);
    }


}

Configuration for database connectivity

add following configuration in properties.properties according to your database

spring.data.mongodb.host =  localhost
spring.data.mongodb.port = 27017
spring.data.mongodb.database = tests

Now you can check the “/reg” endpoint only giving name and id will be auto generated

now ID is auto-generated but it will not work with int or other data types for auto-generation. For auto increment in Mongodb for int and other data types, you check our others tutorials

Thanks for more tutorial check our website https://gangforcode.com