How to map document with dynamic keys to a Spring MongoDb entity class

Question

I have a document that can have dynamic key names:

{
\"_id\" : ObjectId(\"51a29f6413dc992c24e0283e\"),
\"envinfo\" : {
    \"appName\" : \"MyJavaApp\",
    \         


        

Answer 1

This is one way of doing it. There may be other better ways.

Create a map of attributes and store the map in mongo.

public class Env {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private ObjectId id;
    @Field
    private Envinfo envinfo;

    public static class Envinfo {
       @Field
       private String appName;
       @Field
       private Map attributes;
    }
}

If you know the keys in advance, you may add those attributes in Envinfo and keep those out of attributes map.