Update Data Model

function update_data() {
        $user_username = $this->session->userdata('username');

        if (!empty($_FILES['foto_file']['name'])) { // Jika Photo Kosong
            $data = array(
                    'user_nik'          => trim($this->input->post('nik', 'true')),
                    'user_nama'         => trim(ucwords(strtolower($this->input->post('nama', 'true')))),
                    'user_jabatan'      => trim(ucwords(strtolower($this->input->post('jabatan', 'true')))),
                    'user_image'        => $this->upload->file_name,
                    'user_update'       => date('Y-m-d H:i:s')
            );
        } else {
            $data = array(
                    'user_nik'          => trim($this->input->post('nik', 'true')),
                    'user_nama'         => trim(ucwords(strtolower($this->input->post('nama', 'true')))),
                    'user_jabatan'      => trim(ucwords(strtolower($this->input->post('jabatan', 'true')))),
                    'user_update'       => date('Y-m-d H:i:s')
                );
        }

        $this->db->where('user_username', $user_username);
        $this->db->update('rtlh_users', $data);
    }