public async Task <IActionResult> ClassTeacherAssignment(ClassModel model)
        {
            var user = await userManager.GetUserAsync(User);

            ClassRepository     repo  = new ClassRepository(configModel.ConnectionString);
            VolunteerRepository vRepo = new VolunteerRepository(configModel.ConnectionString);

            // Ensure that ONLY staff accounts have access to this API endpoint
            if (user == null || !await userManager.IsInRoleAsync(user, UserHelpers.UserRoles.Staff.ToString()))
            {
                return(Utilities.ErrorJson("Not authorized"));
            }

            // Make sure the provided class and volunteer ids are valid
            if (model.Id == 0 || repo.GetClass(model.Id) == null)
            {
                return(Utilities.ErrorJson("Must include a valid class ID"));
            }
            if (model.TeacherId == 0 || vRepo.GetVolunteer(model.TeacherId) == null)
            {
                return(Utilities.ErrorJson("Must include a valid volunteer id as TeacherId"));
            }

            // Update in the database
            try
            {
                repo.AssignTeacher(model.Id, model.TeacherId);
            }
            catch (Exception e)
            {
                return(Utilities.ErrorJson(e.Message));
            }

            return(Utilities.NoErrorJson());
        }