How to fill non column field of entity in room library

Question

I have a class entity as below

@Entity
public class Task {    
    private String name; 
    private Integer ParentId;
    private Integer userId;   
    @Ignore         


        

Answer 1

Create a sub class of Task suppose

public class TaskDisplayModel extends Task{

@Ignore
private transient int noOfSubTask;

}

Then your query will be

@Query("SELECT *,(SELECT count(*) FROM Task b  WHERE a._id = b.ParentId ) AS noOfSubTask FROM Task a ")
LiveData> getTaskList();