private void Merge(DataModel.Introduction dbItem, IEnumerable <ExternalUrl> newExternalUrls)
{
if (newExternalUrls == null)
{
newExternalUrls = new List <ExternalUrl>();
}
var toRemove = dbItem.ExternalUrls.Where(eu => !newExternalUrls.Any(x => eu.ExternalUrlId == x.Id)).ToList();
foreach (var item in toRemove)
{
dbItem.ExternalUrls.Remove(item);
_context.ExternalUrls.Remove(item.ExternalUrl);
_context.IntroductionExternalUrls.Remove(item);
}
var toAdd = newExternalUrls.Where(x => x.Id == null);
foreach (var item in toAdd)
{
dbItem.ExternalUrls.Add(AbstractionsConverter.ToIntroductionExternalUrl(item));
}
var toUpdate = newExternalUrls.Where(x => x.Id.HasValue);
foreach (var item in toUpdate)
{
var upd = dbItem.ExternalUrls.FirstOrDefault(x => x.ExternalUrlId == item.Id.Value);
upd.ExternalUrl.DisplayName = item.DisplayName;
upd.ExternalUrl.Url = item.Url;
upd.ExternalUrl.Version++;
}
}
