Android Room一对一实体关系

Question

In Room if you want a relation between two entities you can achieve it with a third POJO that defines their relation as:

@Entity
class Foo {
  //fields here including _id,...
}

@Entity // forigne keys restriction here ...
class Baz {
   long foo_id
}

//The linking POJO
class BazWithFoo extends Baz { //may replaced with @Embeded Baz field 

   @Relation(entity = Foo.class,entityColumn = "_id",parentColumn = "foo_id")
   List<Foo> foo; // <-- want this to be Foo not List<Foo>
}

Is there a nice approach to make the POJO expose a single field instead of a List ? Are there any workarounds?

Answer 1

You should see this . It's possible to manage two @Embedded in your POJO