Code improvements

app/Models/Event.php

@@ -169,7 +169,7 @@ class Event extends InstancedModel
     public function paymentMethods() : BelongsToMany {
         // Pivot verknüpft über den Slug (payment_methods.slug), nicht über die numerische id
         // von available_payment_methods -- die tenant-spezifische Instanz wird dadurch implizit
-        // über den globalen SiteScope von AvailablePaymentMethod (gefiltert auf app('tenant')) aufgelöst.
+        // über den globalen SiteScope von AvailablePaymentMethod (gefiltert auf currentTenant()) aufgelöst.
         return $this->belongsToMany(AvailablePaymentMethod::class, 'event_payment_methods', 'event_id', 'slug', 'id', 'slug')
             ->using(EventPaymentMethods::class)
             ->withPivot('configuration')

app/Models/Tenant.php

@@ -50,7 +50,7 @@ class Tenant extends CommonModel
     }
 
     public static function getTempDirectory() : string {
-        return app('tenant')->slug . '/temp-data/';
+        return currentTenant()->slug . '/temp-data/';
     }
 
     /**

app/Models/User.php

@@ -2,7 +2,7 @@
 
 namespace App\Models;
 
-use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
 use Illuminate\Foundation\Auth\User as Authenticatable;
 use Illuminate\Notifications\Notifiable;
 
@@ -115,10 +115,10 @@ class User extends Authenticatable
     }
 
     public function localGroup() : Tenant {
-        return $this->belongsTo(Tenant::class, 'local_group', 'slug')->first();
+        return $this->belongsTo(Tenant::class, 'local_group', 'slug')->firstOrFail();
     }
 
-    public function costUnits()
+    public function costUnits() : BelongsToMany
     {
         return $this->belongsToMany(CostUnit::class, 'cost_unit_treasurers', 'user_id', 'cost_unit_id')
             ->withTimestamps();