Why can't I update a foreign field on my table?

I am using Ormlite and I have an object that has a foreign field.

The said object also has getters and setters for it's fields.

public class Object {

   @DatabaseField(foreign = true)
   private Object2 foreignField;

   Object() {

   }

   public Object2 getForeignField(){ return foreignField; }

   public void setForeignField(Object2 foreignField){ 
       this.foreignField = foreignField; 
   }
}

So I assumed that when I call :

Object testObject;
Object2 testObject2;

testObject.setForeignField(testObject2);
getDao.update(testObject);

It will automatically update the testObject in the database with the new foreignfield's id, but my table is not updating.

What am I doing wrong?

EDIT : By reading the actual documentation on Ormlite, the update(Object) method will not update any foreign objects or foreign collections.

http://ift.tt/1NSTOD6

NOTE: This will not save changes made to foreign objects or to foreign collections.

And now because of that, how do I update a foreign object on a table?