public ActionResult CreateOrEdit(TimelineViewModel model)
{
if (ModelState.IsValid)
{
var db = AppUtilities.CurrentDbContext;
Timeline entity;
bool isCreate = model.Id == null;
if (isCreate)
{
entity = new Timeline();
db.Timelines.Add(entity);
entity.CreatorId = AppUtilities.GetCurrentUserIdRequired();
entity.CreationTimePoint = DateTime.UtcNow;
}
else
{
long idNonNull = (long)model.Id;
entity = CommonUtilities.UniqueSingleOrDefault(db.Timelines.Where(e => e.Id == idNonNull));
if (entity == null)
{
model.Id = null;
return View(model);
}
db.Entry(entity).State = System.Data.Entity.EntityState.Modified;
// Only ID and non-updatable properties can change here, we simply use EntityToModel to reduce duplicate code and increase maintainability.
EntityToModel(entity, model);
}
db.SaveChanges();
if (isCreate)
{
model.Id = entity.Id;
}
}
return View(model);
}
private static TimelineViewModel EntityToModel(Timeline entity, TimelineViewModel model)
{
model.CreationTimePoint = entity.CreationTimePoint;
model.Id = entity.Id;
model.Name = entity.Name;
return model;
}
public ActionResult CreateOrEdit(long? id)
{
TimelineViewModel model = null;
if (id != null)
{
var db = AppUtilities.CurrentDbContext;
long idNonNull = (long)id;
var entity = CommonUtilities.UniqueSingleOrDefault(db.Timelines.Where(e => e.Id == idNonNull));
if (entity == null)
{
throw new ArgumentException();
}
model = new TimelineViewModel();
EntityToModel(entity, model);
}
else
{
model = GetDefaultTimelineForCreate();
}
return View(model);
}