Update File Proposal

// Upload Proposal AKhir
    public function updatefileproposal_post()
    {
        $username = trim($this->post('username'));
        $id       = $this->post('id');

        if ($username == '') {
            $response = [
                'resp_error' => true,
                'resp_msg'   => 'Username kosong.',
            ];
        } elseif ($id == '') {
            $response = [
                'resp_error' => true,
                'resp_msg'   => 'ID Proposal kosong.',
            ];
        } elseif (empty($_FILES['file_pdf']['name'])) {
            $response = [
                'resp_error' => true,
                'resp_msg'   => 'File Proposal harus diisi.',
            ];
        } else {
            $jam                     = time();
            $config['file_name']     = 'Proposal_' . $username . '_' . $jam . '.pdf';
            $config['upload_path']   = './upload_file/proposal/';
            $config['allowed_types'] = 'pdf';
            $config['overwrite']     = true;
            $config['max_size']      = 0;
            $this->load->library('upload', $config);
            if (!$this->upload->do_upload('file_pdf')) {
                $response = [
                    'resp_error' => true,
                    'resp_msg'   => 'File harus PDF.',
                ];
            } else {
                $data = array(
                    'propose_proposal'  => $this->upload->file_name,
                    'propose_update'    => date('Y-m-d H:i:s'),
                );

                $this->db->where('propose_id', $id);
                $this->db->update('lemlit_propose', $data);

                $response = [
                    'resp_error' => false,
                    'resp_msg'   => 'Proposal Berhasil di Simpan.',
                ];
            }
        }

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