protected DBRef createDBRef(Object target, MongoPersistentProperty property) {
Assert.notNull(target);
if (target instanceof DBRef) {
return (DBRef) target;
}
MongoPersistentEntity<?> targetEntity = mappingContext.getPersistentEntity(target.getClass());
targetEntity =
targetEntity == null
? targetEntity = mappingContext.getPersistentEntity(property)
: targetEntity;
if (null == targetEntity) {
throw new MappingException("No mapping metadata found for " + target.getClass());
}
MongoPersistentProperty idProperty = targetEntity.getIdProperty();
if (idProperty == null) {
throw new MappingException("No id property found on class " + targetEntity.getType());
}
Object id = null;
if (target.getClass().equals(idProperty.getType())) {
id = target;
} else {
PersistentPropertyAccessor accessor = targetEntity.getPropertyAccessor(target);
id = accessor.getProperty(idProperty);
}
if (null == id) {
throw new MappingException("Cannot create a reference to an object with a NULL id.");
}
return dbRefResolver.createDbRef(
property == null ? null : property.getDBRef(), targetEntity, idMapper.convertId(id));
}
/**
* Performs the fetch operation for the given {@link DBRef}.
*
* @param ref
* @return
*/
DBObject readRef(DBRef ref) {
return dbRefResolver.fetch(ref);
}
