public ClusterData()
        {
            Context ctx = new Context();

            this.Patients   = new List <Person>();
            this.FoodPlaces = new List <FoodPlace>();
            List <FoodPlace>     RawFoodPlaces = new List <FoodPlace>();
            List <Person>        RawPatients   = new List <Person>();
            PatientAtFoodPlaceDB relationsDB   = new PatientAtFoodPlaceDB();

            this.Relations = new List <PatientAtFoodPlace>(relationsDB.GetAllRelations());
            foreach (var relation in this.Relations)
            {
                RawPatients.Add(relation.Patient);
                RawFoodPlaces.Add(relation.FoodPlace);
            }
            var unique_foodplaces = new HashSet <FoodPlace>(RawFoodPlaces);
            var unique_patients   = new HashSet <Person>(RawPatients);

            this.Patients   = unique_patients.ToList();
            this.FoodPlaces = unique_foodplaces.ToList();
        }
        public ICollection <PatientAtFoodPlace> GetRelations()
        {
            PatientAtFoodPlaceDB dataaccess = new PatientAtFoodPlaceDB();

            return(dataaccess.GetAllRelations());
        }