Export data to excel using Data from Gridview Yii2 - yii2

Question

hi all i faced problems here
after i find a way to retrieve id data from gridview, now my problem is export the data to excel. here is my code in controller
public function actionCetakdispo()
{
$selection=(array)Yii::$app->request->post('selection');
$template = \Yii::getAlias("#webroot") . "/template/dispo.xlsx";
$spreadsheet = \PhpOffice\PhpSpreadsheet\IOFactory::load($template);
$worksheet = $spreadsheet->getActiveSheet();//typecasting
foreach($selection as $id){
$suratmasuks = Smwp::findOne((int)$id);
$baserow = 5;
$no = 1;
foreach($suratmasuks as $suratmasuk){
$row = $no + $baserow;
$worksheet->getCell('A'. $row)->setValue($no);
$worksheet->getCell('B'. $row)->setValue($suratmasuk->jenis_surat);
$worksheet->getCell('C'. $row)->setValue($suratmasuk->perihal);
$no++;
}
}
$writer = \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheet, 'Xlsx');
header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
header('Content-Disposition: attachment;filename="dispo.xlsx"');
header('Cache-Control: max-age=0');
Yii::$app->session->setFlash('success', 'berhasil download!');
$writer->save('php://output');
exit;
}
its show an error : Trying to get property 'jenis_surat' of non-object. if i print_r($surat_masuks), its show like this :
app\models\SmWp Object (
[_attributes:yii\db\BaseActiveRecord:private] => Array (
[id] => 4
[id_mfwp] => 1
[id_user] => 3
[tgl_surat] => 2019-10-08 00:00:00
[tgl_terima] => 2019-10-15 00:00:00
[tgl_cetak] => 2019-10-14 00:00:00
[nomor_surat] => kksksk
[no_agenda] => 992929
[jenis_surat] => 3
[perihal] => balasan surat kami
[lokasi_scan] =>
[ket_dispo] => kerjakan
[index_cetak_dispo] => 0
[index_cetak_reg] => 0
)
[_oldAttributes:yii\db\BaseActiveRecord:private] => Array (
[id] => 4
[id_mfwp] => 1
[id_user] => 3
[tgl_surat] => 2019-10-08 00:00:00
[tgl_terima] => 2019-10-15 00:00:00
[tgl_cetak] => 2019-10-14 00:00:00
[nomor_surat] => kksksk
[no_agenda] => 992929
[jenis_surat] => 3
[perihal] => balasan surat kami
[lokasi_scan] =>
[ket_dispo] => kerjakan
[index_cetak_dispo] => 0
[index_cetak_reg] => 0
)
[_related:yii\db\BaseActiveRecord:private] => Array ( )
[_relationsDependencies:yii\db\BaseActiveRecord:private] => Array ( )
[_errors:yii\base\Model:private] =>
[_validators:yii\base\Model:private] =>
[_scenario:yii\base\Model:private] => default
[_events:yii\base\Component:private] => Array ( )
[_eventWildcards:yii\base\Component:private] => Array ( )
[_behaviors:yii\base\Component:private] => Array ( )
)
thx for explanation..
Edit : this is my gridview code
<?= GridView::widget([
'dataProvider' => $dataProvider,
'filterModel' => $searchModel,
'columns' => [
['class' => 'yii\grid\SerialColumn',],
'id',
'kategori',
'nama_wp',
'nama',
'nomor_surat',
'tgl_surat',
'perihal',
'ket',
['class' => 'yii\grid\CheckboxColumn', 'checkboxOptions' => function($model, $key, $index, $widget) {
return ['value' => $model['id'] ];
},],
],
]); ?>

Answer 1

Method findOne will always return only one instance of Smwp model. Not an array of multiple models.
$suratmasuks = Smwp::findOne((int)$id);
Because \yii\db\ActiveRecord implements IteratorAgregate interface (see documentation) you can use it in foreach like this:
foreach ($suratmasuks as $suratmasuk) {
// ...
}
But in $suratmasuk won't be instances of Smwp but values of attributes of that one instance loaded by findOne.
You can load all models with following find and get rid of outer foreach.
$suratmasuks = Smwp::find()
->where(['id' => $selection])
->all();
Your whole code can look like
public function actionCetakdispo()
{
$selection=(array)Yii::$app->request->post('selection');
$template = \Yii::getAlias("#webroot") . "/template/dispo.xlsx";
$spreadsheet = \PhpOffice\PhpSpreadsheet\IOFactory::load($template);
$worksheet = $spreadsheet->getActiveSheet();//typecasting
$suratmasuks = Smwp::find()
->where(['id' => $selection])
->all();
$baserow = 5;
$no = 1;
foreach($suratmasuks as $suratmasuk){
$row = $no + $baserow;
$worksheet->getCell('A'. $row)->setValue($no);
$worksheet->getCell('B'. $row)->setValue($suratmasuk->jenis_surat);
$worksheet->getCell('C'. $row)->setValue($suratmasuk->perihal);
$no++;
}
$writer = \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheet, 'Xlsx');
header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
header('Content-Disposition: attachment;filename="dispo.xlsx"');
header('Cache-Control: max-age=0');
Yii::$app->session->setFlash('success', 'berhasil download!');
$writer->save('php://output');
exit;
}
If you wanted to keep loading the model by one you should get rid of the inner foreach instead and output it like this:
$baserow = 5;
$no = 1;
foreach($selection as $id){
$suratmasuks = Smwp::findOne((int)$id);
$row = $no + $baserow;
$worksheet->getCell('A'. $row)->setValue($no);
$worksheet->getCell('B'. $row)->setValue($suratmasuks->jenis_surat);
$worksheet->getCell('C'. $row)->setValue($suratmasuks->perihal);
$no++;
}
But this will mean your script will do much more queries to DB so the first way is better.