dropdown list with several times the same item - php

Question

Below my drop-down list is not displaying correctly and I don't know where the problem is. Could it be in my SerieController? I want to create an edit/update system but I've had no success.
SerielController
public function edit($id)
{
$series = Serie::find($id);
$marks = Mark::find($id);
return view('admin.series.edit', compact('series', 'marks'));
}
public function update(Request $request, $id)
{
$request->validate([
'name' => 'required|string',
'fk_mark' => 'required'
]);
$series = Serie::find($id);
$marks = Mark::find($id);
$series->name = $request->get('name');
$series->fk_mark = $request->get('fk_mark');
$series->save();
return redirect()->route('series.index')
->with('success', 'updated successfully');
}
file series.edit.blade
<form class="panel-body" action="{{route('series.update',$series->id)}}" method="POST">
<input name="_method" type="hidden" value="PATCH">
#csrf
<fieldset class="form-group">
<label for="form-group-input-1">Name</label>
<input type="text" name="name" class="form-control" id="form-group-input-1" value="{{$series->name}}">
</fieldset>
<div class="form-group">
<label for="company-content">Select Mark</label>
<select name="fk_mark" id="" class="form-control">
#foreach($series->marks as $mark)
<option value="{{$marks->id}}">
{{$marks->name_mark}}
</option>
#endforeach
</select>
</div>
Model Serie
class Serie extends Model
{
protected $fillable = ['name', 'fk_mark'];
public function marks(){
return $this->belongsTo('App\Mark', 'fk_mark');
}
}
Serie Mark
class Mark extends Model
{
protected $fillable = ['name_mark'];
public function series(){
return $this->hasMany('App\Serie', 'fk_mark');
}
public function cars(){
return $this->hasMany('App\Car','fk_serie');
}
}
Thank you a lot for your help.

Answer 1

In your foreach you made a mistake, the variable should be $mark not $marks
<select name="fk_mark" id="" class="form-control">
#foreach($marks as $mark)
<option value="{{$mark->id}}">
{{$mark->name_mark}}
</option>
#endforeach
</select>
In your edit function you're sending just one Mark to your view, you need to send them all if you want all marks in your select.
public function edit($id)
{
$series = Serie::find($id);
$marks = Mark::all();
return view('admin.series.edit', compact('series', 'marks'));
}