List Reviewer per Proposal

// Daftar List Reviewer per Proposal
    public function listreviewerproposal_post()
    {
        $username = trim($this->post('username'));
        $id       = trim($this->post('id'));

        if ($username == '') {
            $response = [
                'resp_error' => true,
                'resp_msg'   => 'Username tidak ditemukan.',
            ];
        } elseif ($id == '') {
            $response = [
                'resp_error' => true,
                'resp_msg'   => 'ID Proposal kosong.',
            ];
        } else {
            $listData = $this->db->order_by('user_name', 'asc')->get_where('v_reviewerproposal', array('propose_id' => $id))->result();
            if (count($listData) == 0) {
                $response = [
                    'resp_error' => false,
                    'resp_msg'   => 'Belum Data Reviewer',
                ];
            } else {
                foreach ($listData as $r) {
                    $response['items'][] = [
                        'resp_error'    => false,
                        'user_username' => $r->user_username,
                        'nama'          => trim($r->user_name),
                        'fakultas'      => trim($r->faculty_name),
                        'progdi'        => trim($r->study_program_name),
                    ];
                }
            }
        }

        $this->response($response, 200);
    }