public bool Equals(Group objectToCompare)
{
if (objectToCompare == null)
{
return(false);
}
if (ReferenceEquals(this, objectToCompare))
{
return(true);
}
if (UserIds.Count != objectToCompare.UserIds.Count || CreateByUserId != objectToCompare.CreateByUserId)
{
return(false);
}
//If you need equality when order matters - use this
//return UserIds.SequenceEqual(objectToCompare.UserIds);
//This is for set equality. If this is your case and you don't allow duplicates then I would suggest to use HashSet<int> or ISet<int> instead of Collection<int>
//and use their methods for more concise and effective comparison
return(UserIds.All(id => objectToCompare.UserIds.Contains(id)) && objectToCompare.UserIds.All(id => UserIds.Contains(id)));
}
/// <summary>
/// Дополнительные изменения в БД после обновления данных сущности в БД.
/// </summary>
/// <param name="db">контекст БД</param>
/// <param name="entity">обновляемая в БД сущность</param>
public void AfterUpdate(ApplicationDBContext db, Room entity)
{
if (UserIds == null)
{
return;
}
if (entity.Users == null)
{
entity.Users = new List <User>();
}
var userIdsToBeAdded = UserIds;
var usersToBeDeleted = entity.Users
.Where(us => UserIds.All(usId => usId != us.Id)).ToList();
foreach (var user in usersToBeDeleted)
{
entity.Users.Remove(user);
}
userIdsToBeAdded = UserIds
.Where(usId => entity.Users.All(us => us.Id != usId)).ToList();
foreach (var userId in userIdsToBeAdded)
{
entity.Users.Add(db.Set <User>().Find(userId));
}
}