public User UndoMerge(AggregateStore <int> store, int userID, int mergeID)
{
var user = User.Blank();
var events = store.Replay("Users", userID);
var mergeTransformations = new List <Transformation>();
user.LoadFromEvents(events.Apply(e =>
{
var asMerge = e as IMergeEvent;
var isMergeEvent = asMerge != null && asMerge.MergeID == mergeID;
if (isMergeEvent)
{
MergeEvent(user, mergeTransformations, mergeID, e);
}
}));
mergeTransformations
.Where(t => t.HasChangedSinceMerge() == false)
.Select(t => t.UndoEvent)
.ForEach(e => user.PushEvent(e));
return(user);
}