public Result <List <UserAchievementDto> > Handle(CompleteLessonCommand command)
{
var validationResult = completeLessonValidator.Validate(command);
if (validationResult.Failure)
{
return(Result.Fail <List <UserAchievementDto> >(validationResult.Errors));
}
var user = dbContext.Users.Include(x => x.CompletedLessons)
.First(x => x.Username == command.Username);
var completedLesson = user.CompletedLessons.FirstOrDefault(x => x.LessonId == command.LessonId);
if (completedLesson != null)
{
return(UpdateAlreadyCompletedLesson(completedLesson, command));
}
var lessonResult = GetLessonOfPublishedCourse(command.LessonId);
if (lessonResult.Failure)
{
return(Result.Fail <List <UserAchievementDto> >(lessonResult.Errors, lessonResult.StatusCode));
}
var courseId = lessonResult.Value.Chapter.Course.Id;
var chapterId = lessonResult.Value.Chapter.Id;
user.AddCompletedLesson(BuildCompletedLesson(command, courseId, chapterId));
var course = dbContext.Courses.Where(x => x.Id == courseId)
.Include(x => x.Chapters).ThenInclude(x => x.Lessons)
.First();
var achievementTypesToUpdate = achievementTypesCalculator
.CalculateAchievementTypesToUpdate(user.CompletedLessons, course, chapterId);
var achievements = dbContext.Achievements.ToList();
var achievementsUpdatedNow = userAchievementsUpdater.UpdateUserAchievements(user,
course,
achievementTypesToUpdate,
achievements,
DateTime.UtcNow);
dbContext.SaveChanges();
return(Result.Ok(mapper.Map <List <UserAchievementDto> >(achievementsUpdatedNow)));
}
public Result <CourseDto> Handle(CreateCourseCommand command)
{
return(createCourseValidator.Validate(command)
.OnSuccess(() => uniqueCourseNameHandler.Handle(new CourseNameIsUniqueQuery(0, command.Name)))
.OnSuccess(() => SaveCourse(command)));
}