public async Task <ActionResult <StudentDTO> > Create([FromBody] StudentDTO studentDto) { if (string.IsNullOrEmpty(studentDto.Name)) { return(BadRequest()); } var @class = await _dbContext.Class.FindAsync(studentDto.ClassId); if (@class == null) { return(NotFound()); } var existingStudent = await _dbContext.Student.FindAsync(studentDto.Id); if (existingStudent != null) { return(Conflict()); } var studentToAdd = studentDto.ToModel(@class); _dbContext.Student.Add(studentToAdd); await _dbContext.SaveChangesAsync(); var updatedStudentDto = studentToAdd.ToDTO(); return(CreatedAtAction(nameof(Get), new { id = studentDto.Id }, updatedStudentDto)); }