public async Task <CourseDto> UpdateCourseAsync(Guid courseId, CourseUpdateRequest courseRequest)
{
if (courseId == Guid.Empty)
{
throw new ArgumentNullException(nameof(courseId));
}
CourseEntity course = await _context.Courses.FirstOrDefaultAsync(x => x.Id == courseId);
if (course == null)
{
return(null);
}
courseRequest.ToUpdateEntity(ref course);
await _context.SaveChangesAsync();
return(course.ToDto());
}
public async Task <CourseDto> GetAuthorsCourseAsync(Guid authorId, Guid courseId)
{
if (authorId == Guid.Empty)
{
throw new ArgumentNullException(nameof(authorId));
}
if (courseId == Guid.Empty)
{
throw new ArgumentNullException(nameof(courseId));
}
if (!AuthorExists(authorId))
{
return(null);
}
CourseEntity course = await _context.Courses
.Where(c => c.AuthorId == authorId && c.Id == courseId).FirstOrDefaultAsync();
return(course.ToDto());
}