public void Update(
ApplicationUser user,
string title,
string subtitle,
string description,
LanguageTypeEnum?languageType,
string prerequisites,
string refferences,
string targetStudents,
decimal?unitPrice,
decimal?discountAmount,
double?discountPercent,
string imageUrl,
IList <EntityAttribute> entityAttributes
)
{
// 1. varify course update
CourseUpdateValidate(user);
// 2. update course basic info
Title = title ?? Title;
Subtitle = subtitle ?? Subtitle;
Description = description ?? Description;
LanguageType = languageType ?? LanguageType;
ImageUrl = imageUrl ?? ImageUrl;
Prerequisites = prerequisites ?? prerequisites;
Refferences = refferences ?? refferences;
TargetStudents = targetStudents ?? targetStudents;
UnitPrice = unitPrice ?? UnitPrice;
DiscountAmount = discountAmount ?? DiscountAmount;
DiscountPercent = discountPercent ?? DiscountPercent;
LastUpdateDateUTC = DateTime.UtcNow;
// 3. update course attributes
if (entityAttributes != null)
{
// remove the old course attributes
var courseAttributes = Attributes.ToList();
var deleteAttibutes = courseAttributes.Where(a => !entityAttributes.Any(e => a.EntityAttributeId == e.Id));
courseAttributes.RemoveAll(a => deleteAttibutes.Any(d => d.Id == a.Id));
// add the new course attributes
var newEntityAttibutes = entityAttributes.Where(e => !courseAttributes.Any(a => e.Id == a.EntityAttributeId));
foreach (var entityAttibute in newEntityAttibutes)
{
courseAttributes.Add(CourseAttribute.Create(this, entityAttibute));
}
Attributes = courseAttributes;
}
}
/// <summary>
/// Domain Logic
/// </summary>
#region rich domain model logic
public static Course Create(
ApplicationUser user,
string title,
string subtitle,
string description,
LanguageTypeEnum?languageType,
string imageUrl,
IList <EntityAttribute> entityAttributes,
string vimeoAlbumId = null
)
{
// 1. check user
if (user.Tutor == null)
{
throw new CourseValidateException("Course can only be create by Tutor");
}
// 2. create new course
var course = new Course()
{
Tutor = user.Tutor,
Title = title,
Subtitle = subtitle,
Description = description,
LanguageType = languageType ?? LanguageTypeEnum.English,
CreateDateUTC = DateTime.UtcNow,
LastUpdateDateUTC = DateTime.UtcNow,
ImageUrl = imageUrl,
VimeoAlbumId = vimeoAlbumId
};
// 3. add course attributes
/// 虽然只有两行，但是效率较低，还是用for loop吧
//var courseAttibute = entityAttributes.Select(a => CourseAttribute.Create(course, a));
//((List<CourseAttribute>)course.Attributes).AddRange(courseAttibute);
foreach (var entityAttibute in entityAttributes)
{
var courseAttibute = CourseAttribute.Create(course, entityAttibute);
course.Attributes.Add(courseAttibute);
}
// 4. done
return(course);
}