What does Spring Data Couchbase use the _class field for? -

i'm guessing type used crud operations. used else besides that? i'm wondering impact there configuring how gets populated.

the _class field written allow polymorphic properties in domain model. see sample:

class wrapper {   object inner; }  wrapper wrapper = new wrapper(); wrapper.inner = new foo();  couchbaseoperations.save(wrapper); 

you see how field inner foo serialized , persisted. on reading side of things have find out type create object of , type information in wrapper not enough states object.

that's why spring data object mapping persists additional field (name customizable defaulting _class) store information able inspect source document, derive type value written field , map document particular type.

the spring data couchbase reference documentation doesn't document it, can find information way works in docs mongodb module. i've created a ticket spring data couchbase improve on docs that.