Yii2 Select2 and related tables - mysql

Question

I have two related tables. For example,
tbl_one
id
name
tbl_second
id
id_tblone(this is fk)
name
For example:
tbl_one
id: 1
name: input one
tbl_second
id: 1
id_tblone: 1
name: data one
id: 2
id_tblone: 1
name: data two
Select will show:
input one
input two
I want to use Kartik's select in a form that will save new data in tbl_second. So I need Select2 to select id_tblone (or id from tbl_one) and his according name. User needs to select, let's say proper category (from first table - I have fk that relates those two tables) and add some new data under that category in second table.
What would be proper way to do this?
Edit: i have managed so far to show proper names under proper id_tblone, but it saves data with value null in id_tblone column in my second table
In controller:
$query = array();
$query = (new \yii\db\Query())
->select(['id', 'name'])
->from('tbl_one')
->leftJoin('tbl_second', 'tbl_second.id_tblone = tbl_one.id')
->all();
in view:
$data = ArrayHelper::map($query,'name', 'id');
echo Select2::widget([
'name' => 'newname',
'data' => $data,
'pluginOptions' => [
'allowClear' => true
],
]);