public IActionResult Delete(int universityId, bool confirmation = false)
        {
            var universityToDelete = _traversalService.GetUniversity(universityId);

            if (universityToDelete == null)
            {
                return(RedirectToAction("ResourceNotFound", "Error", new { error = "uczelnia o podanym Id nie istnieje." }));
            }

            ConfigureDeleteBreadcrumbs(universityId);

            if (!confirmation)
            {
                var vm = new UniversityViewModel
                {
                    Id = universityId,
                    TitleOrFullName = universityToDelete.Name
                };

                return(View(vm));
            }
            else
            {
                // First - delete materials due to database constraints betwee Lesson and Material
                foreach (var dept in universityToDelete.Departments)
                {
                    foreach (var lesson in dept.Lessons)
                    {
                        foreach (var materialToDelete in lesson.Materials)
                        {
                            _filesManagement.DeleteWholeMaterialFolder(materialToDelete.MaterialId);
                            _materialsService.DeleteMaterial(materialToDelete);
                        }
                    }
                }

                // actually delete
                _managementService.DeleteUniversity(universityToDelete);

                return(RedirectToAction("Universities"));
            }
        }
        public void Delete(int universityId)
        {
            var universityToDelete = _traversalService.GetUniversity(universityId);

            _managementService.DeleteUniversity(universityToDelete);
        }