Как "Выбрать" с помощью nhibernate queryover

Я хочу использовать запрос, чтобы вернуть объект

 public class TaskMap : ClassMap<Task>
    {
        public TaskMap()
        {
            Table("Tasks");
            Id(x => x.TaskId);
            Map(x => x.TaskName).NvarcharWithMaxSize().Not.Nullable();
            Map(x => x.Description).NvarcharWithMaxSize();
            Map(x => x.DueDate).Not.Nullable();
            HasMany(x => x.PersonalTaskReminders).Inverse();
            HasMany(x => x.TaskReminders).Inverse();
            References(x => x.Course).Not.Nullable();
            HasMany(x => x.CompletedTasks);

        }
    }



[Serializable()]
public class Task
{
    public virtual int TaskId { get; private set; }
    public virtual string TaskName { get;  set; }
    public virtual string Description { get; set; }
    public virtual DateTime DueDate { get; set; }
    public virtual IList<PersonalTaskReminder> PersonalTaskReminders { get; set; }
    public virtual IList<TaskReminder> TaskReminders { get; set; }
    public virtual IList<CompletedTask> CompletedTasks { get; set; }
    public virtual Course Course { get; set; }

    public Task()
    {
        PersonalTaskReminders = new List<PersonalTaskReminder>();
        TaskReminders = new List<TaskReminder>();
        CompletedTasks = new List<CompletedTask>();
    }

}
     public class PlannerTask
{
    public int TaskId { get; set; }
    public string TaskName { get; set; }
    public string Description { get; set; }
    public DateTime DueDate { get; set; }
    public List<PersonalTaskReminder> PersonalTaskReminders { get; set; }
    public List<TaskReminder> TaskReminders { get; set; }
    public Course Course { get; set; }
    public bool IsCompleted { get; set; }


}

Попробуйте 1

Task tAlias = null;
        PlannerTask plannerTask = null;
        List<PlannerTask> result = session.QueryOver<Task>(() => tAlias)
            .Select(x => x.Course).TransformUsing(Transformers.AliasToBean<PlannerTask>())               
            .List<PlannerTask>().ToList();

результат: 188 записей со всеми нулями для объекта курса.

Попробуйте 2

Task tAlias = null;
            PlannerTask plannerTask = null;
            List<PlannerTask> result = session.QueryOver<Task>(() => tAlias)
                         .Select(Projections.Property(() => tAlias.TaskId).WithAlias(() => plannerTask.TaskId),
                         Projections.Property(() => tAlias.TaskName).WithAlias(() => plannerTask.TaskName),
                         Projections.Property(() => tAlias.DueDate).WithAlias(() => plannerTask.DueDate),
                         Projections.Property(() => tAlias.Description).WithAlias(() => plannerTask.Description),
                         Projections.Property(() => tAlias.PersonalTaskReminders).WithAlias(() => plannerTask.PersonalTaskReminders),
                         Projections.Property(() => tAlias.TaskReminders).WithAlias(() => plannerTask.PersonalTaskReminders),
                         Projections.Property(() => tAlias.Course).WithAlias(() => plannerTask.Course))
                .TransformUsing(Transformers.AliasToBean<PlannerTask>())               
                .List<PlannerTask>().ToList();

Результат: 188 курсов со всеми свойствами, имеющими почти ту же ошибку

'((new System.Collections.Generic.Mscorlib_CollectionDebugView<Domain.PlannerTask>(result)).Items[0].Course).CoursePermissions' threw an exception of type 'NHibernate.ObjectNotFoundException'

Попробуйте 3

 Task tAlias = null;
        PlannerTask plannerTask = null;
        List<PlannerTask> result = session.QueryOver<Task>(() => tAlias)
             .Select(Projections.Property(() => tAlias.TaskId).WithAlias(() => plannerTask.TaskId),
             Projections.Property(() => tAlias.TaskName).WithAlias(() => plannerTask.TaskName),
             Projections.Property(() => tAlias.DueDate).WithAlias(() => plannerTask.DueDate),
             Projections.Property(() => tAlias.Description).WithAlias(() => plannerTask.Description),
             Projections.ProjectionList().Add(Projections.Property(()=> tAlias.PersonalTaskReminders).WithAlias(() => plannerTask.PersonalTaskReminders)),
             Projections.ProjectionList().Add(Projections.Property(()=> tAlias.TaskReminders).WithAlias(() => plannerTask.PersonalTaskReminders)),
             Projections.Property(() => tAlias.Course).WithAlias(() => plannerTask.Course))
            .TransformUsing(Transformers.AliasToBean<PlannerTask>())               
            .List<PlannerTask>().ToList();


SELECT this_.TaskId      as y0_,
       this_.TaskName    as y1_,
       this_.DueDate     as y2_,
       this_.Description as y3_,
       this_.TaskId      as y4_,
       this_.TaskId      as y4_,
       this_.CourseId    as y4_
FROM   Tasks this_

Результат:

CoursePermissions = '((Castle.Proxies.CourseProxy)((new System.Collections.Generic.Mscorlib_CollectionDebugView<PlannerTask>(result)).Items[0].Course)).CoursePermissions' threw an exception of type 'NHibernate.ObjectNotFoundException'

попробуйте 4

Попробуйте 4

 Task tAlias = null;
        PlannerTask plannerTask = null;
        List<PlannerTask> result = session.QueryOver<Task>(() => tAlias)
             .Select(Projections.Property(() => tAlias.TaskId).WithAlias(() => plannerTask.TaskId),
             Projections.Property(() => tAlias.TaskName).WithAlias(() => plannerTask.TaskName),
             Projections.Property(() => tAlias.DueDate).WithAlias(() => plannerTask.DueDate),
             Projections.Property(() => tAlias.Description).WithAlias(() => plannerTask.Description),
             Projections.Property(() => tAlias.Course).WithAlias(() => plannerTask.Course))
            .TransformUsing(Transformers.AliasToBean<PlannerTask>())               
            .List<PlannerTask>().ToList();


SELECT this_.TaskId      as y0_,
       this_.TaskName    as y1_,
       this_.DueDate     as y2_,
       this_.Description as y3_,
       this_.CourseId    as y4_
FROM   Tasks this_

Работает. Я могу получить доступ ко всему в объекте курса.

Кажется, проблема с

tAlias.PersonalTaskReminders и tAlias.TaskReminders. Если я удалю этот курс, вы получите штраф.

Я не понимаю, почему.

Ответы

Ответ 1

Я думаю, проблема в том, что вы пытаетесь проецировать объекты прокси-объекта. Проекции предназначены для плоских объектов передачи данных. Вы можете объявить свойства курса, необходимые для этого представления.

public class PlannerTask
{
    public int TaskId { get; set; }
    public string TaskName { get; set; }
    public string Description { get; set; }
    public DateTime DueDate { get; set; }
    //flatten Course object
    public int CourseId { get; set; }
    public int CourseName { get; set; }
    public bool IsCompleted { get; set; }
}

Список выбора можно немного упростить...

PlannerTask plannerTask = null;
Course courseAlias = null;

List<PlannerTask> result = session.QueryOver<Task>()
    .JoinAlias(x => x.Course, () => courseAlias)
    .SelectList(list => list
        .Select(x => x.TaskId).WithAlias(() => plannerTask.TaskId)
        .Select(x => x.TaskName).WithAlias(() => plannerTask.TaskName)
        .Select(x => x.DueDate).WithAlias(() => plannerTask.DueDate)
        .Select(x => x.Description).WithAlias(() => plannerTask.Description)
        .Select(x => x.Course.Id).WithAlias(() => plannerTask.CourseId))
        .Select(x => courseAlias.Name).WithAlias(() => plannerTask.CourseName))
    .TransformUsing(Transformers.AliasToBean<PlannerTask>())               
    .List<PlannerTask>();