public IActionResult InsertStudent(EnrollmentPost student)
        {
            /* uniqueness of index number */
            if (student.IndexNumber == null || !_dbService.IsStudentNumberUnique(student.IndexNumber))
            {
                return(BadRequest("Student with given index number already exists in the database."));
            }

            /* checking if database contains studies with given name */
            if (student.Studies == null || !_dbService.StudiesAvailable(student.Studies))
            {
                return(BadRequest("Database does not contain studies with given name."));
            }

            /* enrollments */
            if (!_dbService.CreateEnrollment(student))
            {
                return(BadRequest("Failed to create enrollment."));
            }

            /* returned result */
            return(Created("Student created", _dbService.ReturnedEnrollmentResult(student)));
        }
 Models.Enrollment IStudentsDbService.ReturnedEnrollmentResult(EnrollmentPost student)
 {
     throw new NotImplementedException();
 }
 public bool CreateEnrollment(EnrollmentPost student)
 {
     throw new NotImplementedException();
 }