/// <summary>
/// Converts changes for given type from a <see cref="DbContext"/> to a <see cref="DeltaSet{T}"/>.
/// </summary>
/// <typeparam name="T">The entity type to get changes for.</typeparam>
/// <param name="store">The <see cref="DbContext"/> where changes are tracked.</param>
/// <returns>An instance of <see cref="DeltaSet{T}"/> containing changes for the given type.</returns>
public static DeltaSet <T> GetChanges <T>(this DbContext store)
where T : class
{
return(new DeltaSet <T>(store.ChangeTracker.Entries <T>()
.Where(e => e.State != EntityState.Unchanged && e.State != EntityState.Detached)
.Select(entry => entry.State switch
{
EntityState.Modified => DeltaEntity.Updated(entry.Entity),
EntityState.Added => DeltaEntity.Added(entry.Entity),
EntityState.Deleted => DeltaEntity.Removed(entry.Entity),
_ => throw new NotSupportedException(),
})));
public bool Remove(DeltaEntity <T> item) => _changes.Remove(item);
public bool Contains(DeltaEntity <T> item) => _changes.Contains(item);
public void Add(DeltaEntity <T> item) => _changes.Add(item);
