public void UpdateJourney(int id, Journey journey)
 {
     Journey to_update = journeys.FirstOrDefault(j => j.JourneyId == id);
     to_update = journey;
     context.SaveChanges();
 }
 public void CreateJourney(Journey journey)
 {
     journey.CreateEmptyCategoryList();
     journeys.Add(journey);
     context.SaveChanges();
 }