Codeigniter - Form validation not works - forms

Question

I already try to googling but not solve, my code below is to check duplicate before insert, when "tagnumber" field already exists will go to specific page and not inserted to table, it works but the problem is although not insert to the table but it wont go to specific page I want.
below is my problem on conditional statements:
if data exists on form validation will execute not insert the data.
if data not exists form validation will execute insert data but go to wrong page (same page with exists data page).
my controoler :
function tambahSubmit()
{
$tagnumber = $this->input->post("tagnumber");
$this->myigniter_model->addData($tagnumber);
$this->load->helper(array('form', 'url'));
$this->load->library('form_validation');
// field name, error message, validation rules
$this->form_validation->set_rules('tagnumber', 'tagnumber', 'trim|required|is_unique[inventorytag.tagnumber]');
$this->form_validation->set_rules('date', 'date', 'trim|required');
$this->form_validation->set_rules('employee', 'employee', 'trim|required');
$this->form_validation->set_rules('semnumber', 'semnumber', 'trim|required');
$this->form_validation->set_rules('quantity', 'quantity', 'required');
$this->form_validation->set_rules('area', 'area', 'trim|required');
if($this->form_validation->run() == false)
{
$this->load->view('YearEndStock/tampilan_input_gagal');
}
else
{
$this->myigniter_model->addData($tagnumber);
$this->load->view('YearEndStock/tampilan_input_sukses');
}
}
my model :
function addData($tagnumber)
{
// Added $this->db->escape() and limit 1 for Performance
$query = $this->db->query("SELECT tagnumber FROM inventorytag WHERE tagnumber = ".$this->db->escape($tagnumber)." limit 1");
$data = array(
'tagnumber' => $this->input->post('tagnumber'),
'date'=> date('Y-m-d H:i:s'),
'employee' => $this->input->post('employee'),
'semnumber' => $this->input->post('semnumber'),
'quantity' => $this->input->post('quantity'),
'area' => $this->input->post('area')
);
return $query->num_rows() == 0 ? $this->db->insert('inventorytag', $data) : false;
}

Answer 1

Then you just need to separate your true statement. Remove your is_unique validation.
if($this->form_validation->run() == false)
{
SHOW ERRORS
$this->load->view('YearEndStock/tampilan_input_gagal');
}
else
{
$row = $this->db->get_where('inventorytag', array('tagnumber' => $tagnumber))->row();
if (empty($row)) {
//insert
$this->myigniter_model->addData($tagnumber);
} else {
//row exists
}
$this->load->view('YearEndStock/tampilan_input_sukses');
}