How to retrieve data from multiple tables in Laravel 5.4 - php

Question

I have two tables and i would like to retrieve data from them and pass it to my table.
For this I've created 2 models with an one to one relationship:
[Adress]
class Adress extends Model
{
public function KontoKorrent()
{
return $this->hasOne(KontoKorrent::class, 'Adresse');
}
}
[KontoKorrent]
class KontoKorrent extends Model
{
public function Adresse()
{
return $this->belongsTo(Adress::class,'Adresse');
}
}
My controller look like this:
class AdressesController extends Controller
{
public function index()
{
$adresses = Adress::with('KontoKorrent')->paginate(2);
return view('welcome', compact('adresses'));
}
}
When I use tinker
App\Adress::
Every adress has relation to the kontokorrent. This is working.
App\Adress {#698
Adresse: "3030",
Anrede: "Company",
Name1: "A Company Name",
LieferStrasse: "Dummystreet",
KontoKorrent: App\KontoKorrent {#704
Location: "1",
Adresse: "3030",
Kto: "S0043722",
In my view:
<ul>
#foreach($adresses as $adress)
<li>{{ $adress->Name1 }}</li> //this is working
<li>{{ $adress->KontoKorrent->Kto }}</li> //this is NOT working
#endforeach
</ul>
{{ $adresses->links() }}
The relation is showing me an error:
Trying to get property of non-object
What I'm doing wrong ?

Answer 1

The error that you are getting:
Trying to get property of non-object
Is related to some Adress model that doesn't have a KontoKorrent, then your $adress->KontoKorrent returns null, and null isn't a object, that the reason of the message.
To fix it, you should do an if to check if adress have the relationship:
<ul>
#foreach($adresses as $adress)
<li>{{ $adress->Name1 }}</li> //this is working
<li>
#if($adress->KontoKorrent)
{{ $adress->KontoKorrent->Kto }}
#else
<!-- Put something here if you want, otherwise remove the #else -->
#endif
</li> //this is NOT working
#endforeach
</ul>
This can be shortened to:
{{ $adress->KontoKorrent ? $adress->KontoKorrent : 'the else content' }}
or in PHP >= 7.0, you can use the null coalesce operator:
{{ $adress->KontoKorrent ?? 'the else content' }}