Laravel 更新有很多关系

Question

I've got the following:

MirrorModule Model

/**
 * @return \Illuminate\Database\Eloquent\Relations\HasMany
 */
public function xous()
{
    return $this->hasMany('App\Models\Xou');
}

Xou model

public function mirrorModule()
{
    return $this->belongsTo('App\Models\MirrorModule');
}

Basic stuff here. All I want is update the just like the sync method in ManyToMany which takes id's and figures out the rest for you.

I've got an array coming in looks like this:

What I have tried

   if ($request->has('xous')) {
            $arr = [];
            foreach ($data['xous'] as $value) {
            // $arr[] = [
            //     'id' => $value['id'],
            // ];
            // $arr[] = $value;
           $xous = Xou::findOrFail($value['id']);
          $mm = $mirrorModule->xous()->where('mirror_module_id',$mirrorModule['id'])->get(); 
          $mm->update() // ?? or save()  save returns error 

        }
    }

I also looked over this article to implement my own sync method, but can't get it work.

Any ideas? Other approaches are welcome as well.

Answer 1

Use whereIn on an array of ids:

$ids = array_map(function ($item) {
    return $item['id']:
}, $request->get('xous'));

$mirrorModule->xous()->whereIn('id', $ids)->update(...);

Answer 2

You're calling ->update() on Collection object, ->get() returns a Collection object, not a model or a query.

What you need to do (if I understood correctly what you want) is

 if ($request->has('xous')) {
        $arr = [];
        foreach ($data['xous'] as $value) {
        // $arr[] = [
        //     'id' => $value['id'],
        // ];
        // $arr[] = $value;
       $xous = Xou::findOrFail($value['id']);
       $mm = $mirrorModule->xous()->where('mirror_module_id',$mirrorModule['id'])->update([
           'attribute_to_update' => 'some_value'
       ]); 

    }
}

which will basically update all rows in database with that mirror_module_id with some value.

Answer 3

Please, avoid executing queries within the loop. findOrFail accepts array of ids, so you can extract ids to temp variable, and then do bulk update. Update method accepts array of arguments you want to change (update).

Answer 4

您可以按照以下方式操作：

 $category->posts()->update(['category_id' => $newCatId]);