how to set default value for mongodb by using springboot?

Question

I want insert a Bean like below into mongodb,I use springboot 2.0.4.RELEASE,I want the a field have a default value such as 100.00,how to do it?

 public class Bean{
    String uid;
    double a;
}

Answer 1

you must annotate your Bean, it is preferred to have id in your collection

import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;

@Document(collection = "your_collection_name")
public class Bean {

    @Id
    private String id;

    private String uid;
    private double a = 100.00;

    //getter and setter methods
}