Indirect modification of overloaded on Laravel - Relationship - laravel

Question

I use Laravel 5 and i have 2 tables:
"Link" Table with 7 columns, one of them is "image_id" column.
"Image" Table, in this table i have two column, an "id" and "url".
I want to update my Link database and also it's related image url with single update method.
I have tried this code:
public function update(Request $request, $id)
{
// Validate the data
$link = Link::find($id);
$this->validate($request, array(
'title' => 'required|max:255',
'link' => 'nullable',
'description' => 'required'
));
$link = Link::find($id);
$link->title = $request->input('title');
$link->link = $request->input('link');
$link->description = $request->input('description');
$link->linkImage->url = 'testurl';
$link->save();
Session::flash('success', "Le lien à été correctement mis à jour.");
return redirect()->route('links.index');
}
This is my Link class:
<?php
namespace App\Models\Services;
use Illuminate\Database\Eloquent\Model;
class Link extends Model
{
/**
* The table associated with the model.
*
* #var string
*/
protected $table = 'service_rubrique_link';
protected $fillable = ['title','description','ordre','image_id'];
public function linkImage()
{
return $this->belongsTo('App\Models\Storage\Imageup');
}
}
And my Image Class:
<?php
namespace App\Models\Storage;
use Illuminate\Database\Eloquent\Model;
class Imageup extends Model
{
/**
* The table associated with the model.
*
* #var string
*/
protected $table = 'image';
protected $fillable = ['id','url'];
public function servlinks()
{
return $this->hasMany('App\Models\Services\Link');
}
}
When i want to save i have this error:
Indirect modification of overloaded property
App\Models\Services\Link::$linkImage has no effect
Do you have any idea of what is wrong with my code ?
Thank you.

Answer 1

As the message says the property is a lazy loaded sub model.
Updating does not makevsense... you should use it as method (query builder) linkimage() and then use for example ->update(['propertyname' => 'value'])
See https://laravel.com/docs/7.x/eloquent-relationships#inserting-and-updating-related-models