How to save update from relationships model Laravel 5.3 - php

Question

I want to save an update from One to Many relation model in Laravel 5.3, but I have this error.
FatalThrowableError in HasOneOrMany.php line 221:
Type error: Argument 1 passed to Illuminate\Database\Eloquent\Relations\HasOneOrMany::save() must be an instance of Illuminate\Database\Eloquent\Model, instance of Illuminate\Database\Eloquent\Collection given, called in C:\xampp\htdocs\wismasejahtera\app\Http\Controllers\JurnalController.php on line 129
Here is my Jurnals model:
public function djurnals()
{
return $this->hasMany('App\DJurnals', 'jurnal_id');
}
And here is my Djurnals model:
public function jurnals()
{
return $this->belongsTo('App\Jurnals');
}
public function rekenings()
{
return $this->belongsTo('App\Rekenings');
}
And here is my Controller:
$jurnal = Jurnals::find($id);
$jurnal->no_jurnal = $request->no_jurnal;
$jurnal->tgl_jurnal = $tglJurnalFix;
$jurnal->keterangan = $request->keterangan;
$jurnal->save();
//ini Array
$kode_rekening = $request->kode_rekening;
for($i=0; $i<count($kode_rekening); $i++){
$djurnal = Djurnals::where('jurnal_id', $id)->get();
$djurnal->kode_rekening = $request->kode_rekening[$i];
$djurnal->keterangan_rekening = $request->keterangan_rekening[$i];
$djurnal->d_k = $request->d_k[$i];
$djurnal->jumlah = $request->jumlah[$i];
if($request->d_k[$i] == 'D'){
$saldoRekKas = Rekenings::where('kode_rekening', 'like', '111%')
->increment('saldo', $request->jumlah[$i]);
}
else{
$saldoRekKas = Rekenings::where('kode_rekening', 'like', '111%')
->decrement('saldo', $request->jumlah[$i]);
}
$jurnal->djurnals()->save($djurnal);
}
return Redirect::to('jurnal');
And the error is in this row in Controller:
$jurnal->djurnals()->save($djurnal);
When I use this way to save a new jurnal and djurnal, it works correctly. But, When I try to save an update, it show an error. How can I save this update data to database? Anyone can help me?

Answer 1

Since you use the jurnal_id to get the Djurnals model, you need to save it directly.
Replace
Djurnals::where('jurnal_id', $id)->get();
With
Djurnals::where('jurnal_id', $id)->first();
Replace
$jurnal->djurnals()->save($djurnal);
With
$djurnal->save();
$jurnal->djurnals()->save($djurnal); Should be used only when saving a newly created model.