如何在Laravel中一次更新多行的hasMany关系数据

我想更新SubCategory，它与Category的关系是hasMany关系。现在我想从一个窗体一次更新类别和子类别。我想更新属于该类别的每个子类别。但我不能那样做。以下是类别模型：

class Category extends Model
{
use HasFactory;
protected $guarded=[];
public function subcategory(){
return $this->hasMany('AppModelsSubCategory');
}

以下是子类别模型：

class SubCategory extends Model
{
use HasFactory;
protected $guarded=[];
public function category(){
return 
$this>belongsTo('AppModelsCategory','category_id','id');
}

这是控制器中的更新功能：

public function categoryUpdate(Request $request,$id){

if (is_null($this->user) || !$this->user->can('categories-update')) {

abort(403, 'Sorry !! You are Unauthorized  !');
}
$request->validate([
'name' =>  'required|max:191',
'status' => 'required',     
]);
$Category=Category::findOrFail($id);
$Category->name = $request->name;
$Category->slug = Str::slug($request->name);
$Category->status = $request->status;

$Category->updated_by=Auth::user()->id;
$Category->update();

if($request->subcategory_name !=['']){
foreach($request->subcategory_name as $subcat){
if($subcat !=''){
SubCategory::create([
'name'=>json_encode($subcat),
'slug'=>Str::slug(json_encode($subcat)),
'category_id'=>$id,
'created_by' =>Auth::user()->id,
]);
}
}
}
Alert::success('Success','Category has been updated successfully!');
return redirect()->route('category.index');
}

我不知道一次更新多个子类别的代码。

这是Html表单

<form action="{{ route('category.update', $data->id) }}" method="POST">
@csrf
<div class="form-group">
<label for="" class="mb-2">Category name</label>
<input name="name" class="form-control" value="{{ $data->name }}" type="text"
@error('name') is-invalid @enderror" placeholder="Name">
@error('name')
<div class="text-danger">* {{ $message }}</div>
@enderror
</div><br>
<div class="form-group">
<label for="" class="mb-2">SubCategory name</label>
@foreach ($subcat as $sub)
<div class="d-flex w-70 justify-content between mb-2">
<input name="subcategoryname[]" id="subcategoryname" class="form-control w-50" type="text" value="{{json_decode($sub->name)}}"></input>
<button  onclick="deleteSubcategory({{$sub->id}})" id="delete_subcat"  class="btn btn-danger btn-sm ms-2"><i
class="fa fa-trash text-dark" style="font-size:20px;color:white!important"
aria-hidden="true"></i></button>
</div>
@endforeach

</div><br>
<div class="form-group mt-2">
<label for="" class="mb-2">Add New SubCategory</label>
<div class="subcategory w-50">
<div class="d-flex mb-2">
<input name="subcategory_name[]" class="form-control" id="name" type="text"
placeholder="Name" multiple>
<span id="add" class="btn btn-dark ms-3">+</span>
</div>
</div>
<div class="form-group mt-2">
<label for="" class="mb-2">Status</label>
<br>
<select name="status" class="form-control" style="width:40%"
@error('status') is-invalid @enderror">
<option value="">--Select Status--</option>
<option value="Active" @if ($data->status == 'Active') selected @endif>Active
</option>
<option value="Inactive" @if ($data->status == 'Inactive') selected @endif>Inactive
</option>
</select>
@error('status')
<div class="text-danger">* {{ $message }}</div>
@enderror
</div>
<div class="form-group mt-4 d-flex justify-content-between">
<button type="button" class="btn btn-secondary btn-sm"
data-bs-dismiss="modal">Cancel</button>

<input class="btn btn-primary btn-sm"type="submit" value="Update">
</div>
</form>