Load data to a form from a different model in yii2 - yii2

Question

I am creating a form to insert data into table salary. The associated Model is Salary. in the form I have fields s_wageperday,s_conveyanceperday. I have a separate table ratechart where these values are already stored. There's only one row in the table ratechart and it should be.the columns are - wage_per_day, conveyance_per_day. What I want is - when I load the Create form for salary - It should load the data from ratechart table in the respective textfield.
What I've done -
In RatechartController I've added the following code
public function actionGetForRatechart()
{
$rates = Employee::findOne(1)->asArray();
//$bottle -> select(['productnames.productnames_productname','productnames.bottletype','bottlename.unitprice'])->from('Productnames')->leftJoin('bottlename','productnames.bottletype = bottlename.bottlename')->where(['productnames_productname'=>$catid])->limit(1);
echo Json::encode($rates);
}
As far I know this data can be pulled to the form using Javascript in salary _form
Javascriptcode I've written so far (which is probably wrong) -
<?php
$script = <<< JS
$('#rateid').change(function(){
var = $(this).val();
$.get('index.php?r=salary/ratechart/get-for-ratechart',{ 1 : 1 }, function(data){
alert(data);
var data = $.parseJSON(data);
$('#salary-s_wageperday').attr('value',data.wage_per_day);
});
});
JS;
$this->registerJs($script);
?>
Please help.
Model Salary
<?php
namespace frontend\modules\salary\models;
use Yii;
/**
* This is the model class for table "salary".
*
* #property string $s_id
* #property string $s_date
* #property string $s_period
* #property string $s_empid
* #property string $s_empname
* #property integer $s_workingdays
* #property integer $s_leave
* #property integer $s_holiday
* #property integer $s_wageperday
* #property integer $s_totalwage
* #property integer $s_ovthour
* #property integer $s_ovtrateperhour
* #property integer $s_ovtamount
* #property integer $s_tiffinworkingday
* #property integer $s_tiffinrateperday
* #property integer $s_wdtiffinamount
* #property integer $s_sundayworked
* #property integer $s_sundayrate
* #property integer $s_sundaytiffinamount
* #property integer $s_nightcount
* #property integer $s_nightallrate
* #property integer $s_nightallowance
* #property integer $s_convday
* #property integer $s_convrate
* #property integer $s_conveyanceamount
* #property integer $s_tiffinovtcount
* #property integer $s_tiffinovtrate
* #property integer $s_tiffinovtamount
* #property integer $s_incentivecount
* #property integer $s_incentiverate
* #property integer $s_incentive
* #property integer $s_totalearning
* #property integer $s_epf
* #property integer $s_esi
* #property integer $s_ptax
* #property integer $s_takehome
*/
class Salary extends \yii\db\ActiveRecord
{
public $value;
public $totaldays;
public $ratechart;
/**
* #inheritdoc
*/
public static function tableName()
{
return 'salary';
}
/**
* #inheritdoc
*/
public function rules()
{
return [
[['s_date', 's_period', 's_empid', 's_empname','s_workingdays', 's_leave', 's_holiday','s_wageperday', 's_totalwage', 's_ovthour', 's_ovtrateperhour', 's_ovtamount', 's_tiffinworkingday', 's_tiffinrateperday', 's_wdtiffinamount', 's_sundayworked', 's_sundayrate', 's_sundaytiffinamount', 's_nightcount', 's_nightallrate', 's_nightallowance', 's_convday', 's_convrate', 's_conveyanceamount', 's_tiffinovtcount', 's_tiffinovtrate', 's_tiffinovtamount', 's_incentivecount', 's_incentiverate', 's_incentive', 's_totalearning', 's_epf', 's_esi', 's_ptax', 's_takehome'], 'required'],
[['s_date','value','totaldays'], 'safe'],
[['s_workingdays', 's_leave', 's_holiday', 's_wageperday', 's_totalwage', 's_ovthour', 's_ovtrateperhour', 's_ovtamount', 's_tiffinworkingday', 's_tiffinrateperday', 's_wdtiffinamount', 's_sundayworked', 's_sundayrate', 's_sundaytiffinamount', 's_nightcount', 's_nightallrate', 's_nightallowance', 's_convday', 's_convrate', 's_conveyanceamount', 's_tiffinovtcount', 's_tiffinovtrate', 's_tiffinovtamount', 's_incentivecount', 's_incentiverate', 's_incentive', 's_totalearning', 's_epf', 's_esi', 's_ptax', 's_takehome'], 'integer'],
[['s_period'], 'string', 'max' => 15],
[['s_empid'], 'string', 'max' => 20],
[['s_empname'], 'string', 'max' => 70],
];
}
/**
* #inheritdoc
*/
public function attributeLabels()
{
return [
's_id' => 'ID',
's_date' => 'Date',
's_period' => 'Period',
's_empid' => 'Empid',
's_empname' => 'Empname',
's_workingdays' => 'Workingdays',
's_leave' => 'Leave',
's_holiday' => 'Holiday',
's_wageperday' => 'Wageperday',
's_totalwage' => 'Totalwage',
's_ovthour' => 'Ovthour',
's_ovtrateperhour' => 'Ovtrateperhour',
's_ovtamount' => 'Ovtamount',
's_tiffinworkingday' => 'Tiffinworkingday',
's_tiffinrateperday' => 'Tiffinrateperday',
's_wdtiffinamount' => 'Wdtiffinamount',
's_sundayworked' => 'Sundayworked',
's_sundayrate' => 'Sundayrate',
's_sundaytiffinamount' => 'Sundaytiffinamount',
's_nightcount' => 'Nightcount',
's_nightallrate' => 'Nightallrate',
's_nightallowance' => 'Nightallowance',
's_convday' => 'Convday',
's_convrate' => 'Convrate',
's_conveyanceamount' => 'Conveyanceamount',
's_tiffinovtcount' => 'Tiffinovtcount',
's_tiffinovtrate' => 'Tiffinovtrate',
's_tiffinovtamount' => 'Tiffinovtamount',
's_incentivecount' => 'Incentivecount',
's_incentiverate' => 'Incentiverate',
's_incentive' => 'Incentive',
's_totalearning' => 'Totalearning',
's_epf' => 'EPF',
's_esi' => 'ESI',
's_ptax' => 'PTax',
's_takehome' => 'Takehome',
];
}
}
Model Ratechart
<?php
namespace frontend\modules\salary\models;
use Yii;
/**
* This is the model class for table "ratechart".
*
* #property integer $rc_id
* #property integer $ovt_per_hour
* #property integer $tiffin_per_working_day
* #property integer $conveyance_per_working_day
* #property integer $tiffin_per_ovt_day
* #property integer $tiffin_per_sunday
* #property integer $night_allowance_per_night
* #property integer $incentive_per_count
*/
class Ratechart extends \yii\db\ActiveRecord
{
/**
* #inheritdoc
*/
public static function tableName()
{
return 'ratechart';
}
/**
* #inheritdoc
*/
public function rules()
{
return [
[['rc_id'], 'required'],
[['rc_id', 'ovt_per_hour', 'tiffin_per_working_day', 'conveyance_per_working_day', 'tiffin_per_ovt_day', 'tiffin_per_sunday', 'night_allowance_per_night', 'incentive_per_count'], 'integer'],
];
}
/**
* #inheritdoc
*/
public function attributeLabels()
{
return [
'rc_id' => 'Rc ID',
'ovt_per_hour' => 'Ovt Per Hour',
'tiffin_per_working_day' => 'Tiffin Per Working Day',
'conveyance_per_working_day' => 'Conveyance Per Working Day',
'tiffin_per_ovt_day' => 'Tiffin Per Ovt Day',
'tiffin_per_sunday' => 'Tiffin Per Sunday',
'night_allowance_per_night' => 'Night Allowance Per Night',
'incentive_per_count' => 'Incentive Per Count',
];
}
}
I've tried the following code in my _form
<?= $form->field('s_ovtrateperhour', Ratechart::findOne(1)->ovt_per_hour,['showLabels'=>false])->textInput(['placeholder'=>'Overtime rate per hour']) ?>
But getting error - Call to a member function formName() on string