MongoDB Abstract Type Mapping excludes _class when Pushing
I am have the following class hierarchy.
Code:
public class Sensor {
List<Event> events;
}
public abstract class Event { ... }
public class PressureEvent extends Event { ... }
When I save a Sensor instance with an event, the _class property is added.
Code:
mongoTemplate.save(sensor, Sensor.class);
{ "_class" : "com.acme.Sensor",
"events" : [
{
"_class" : "com.acme.PressureEvent",
...
}
]
}
When I push an event onto the Sensor instance's event array the _class property is not added.
Code:
mongoTemplate.updateFirst(new Query(Criteria.where("_id").is(new ObjectId(sensor.getId()))), new Update().push("events", event), Sensor.class);
{ "_class" : "com.acme.Sensor",
"events" : [
{
...
}
]
}
After an Event instance without a _class field is pushed onto the events array the sensor instance cannot be loaded due to the mapper not knowing the type of class.
Code:
org.springframework.data.mapping.model.MappingInstantiationException: Could not instantiate bean class [com.acme.Event]: Is it an abstract class?; nested exception is java.lang.InstantiationException
Is this a bug or the intended behavior? Am I pushing onto the array improperly?
I am using spring-data-mongodb-1.0.1.RELEASE.
