如何使用Morphia获取MongoDB的所有非结构化字段

Question

I have some data stored in MongoDb, that currently I do not want to map on POJO, How we can get all unstructured fields of Documents in a single map.

I found this link
http://www.carfey.com/blog/using-mongodb-with-morphia/
that says you can mapped all unstructured fields using

// .. our base attributes here
private Map<String, Object> attributes

but its not working as I am contiguously getting it null, I checked the Morphia code, It iterates on Morphia entity class fields, so how can we get all DBObject unmapped fields in attributes Map.

Answer 1

Out of interest: Why would you do that? You'll need to map the class and the one field, in which you want to add your data, to Morphia anyway. Or am I misunderstanding you?

How to do it: You'll need to annotate all fields you want to store in the map with @Transient and add / load them in your custom @PrePersist and @PostLoad methods.