private Course(Guid id,
CourseName courseName,
CourseDescription courseDescription,
Author author,
List <Video> videos) : base(id)
{
CourseName = courseName;
CourseDescription = courseDescription;
Author = Guard.Argument(author, nameof(author)).NotNull();
_videos = new List <Video>();
Guard.Argument(videos, nameof(videos)).NotNull();
videos.ForEach(video => AddVideo(video));
}
public virtual void UpdateDescription(string description)
{
CourseDescription = new CourseDescription(description);
}