guarded instead of fillable

app/Models/Category.php

@@ -10,14 +10,11 @@ class Category extends Model
     use HasFactory;
 
     /**
-     * The attributes that are mass assignable.
+     * The attributes that aren't mass assignable.
      *
      * @var array
      */
-    protected $fillable = [
-        'name',
-        'slug',
-    ];
+    protected $guarded = [];
 
     /**
      * The attributes that should be cast to native types.

app/Models/City.php

@@ -4,31 +4,40 @@ namespace App\Models;
 
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
+use Spatie\Sluggable\HasSlug;
+use Spatie\Sluggable\SlugOptions;
 
 class City extends Model
 {
     use HasFactory;
+    use HasSlug;
 
     /**
-     * The attributes that are mass assignable.
-     *
+     * The attributes that aren't mass assignable.
      * @var array
      */
-    protected $fillable = [
-        'country_id',
-        'name',
-    ];
+    protected $guarded = [];
 
     /**
      * The attributes that should be cast to native types.
-     *
      * @var array
      */
     protected $casts = [
-        'id' => 'integer',
+        'id'         => 'integer',
         'country_id' => 'integer',
     ];
 
+    /**
+     * Get the options for generating the slug.
+     */
+    public function getSlugOptions(): SlugOptions
+    {
+        return SlugOptions::create()
+                          ->generateSlugsFrom('name')
+                          ->saveSlugsTo('slug')
+                          ->usingLanguage('de');
+    }
+
     public function country(): \Illuminate\Database\Eloquent\Relations\BelongsTo
     {
         return $this->belongsTo(Country::class);

app/Models/Country.php

@@ -10,14 +10,11 @@ class Country extends Model
     use HasFactory;
 
     /**
-     * The attributes that are mass assignable.
+     * The attributes that aren't mass assignable.
      *
      * @var array
      */
-    protected $fillable = [
-        'name',
-        'code',
-    ];
+    protected $guarded = [];
 
     /**
      * The attributes that should be cast to native types.

app/Models/Course.php

@@ -10,14 +10,11 @@ class Course extends Model
     use HasFactory;
 
     /**
-     * The attributes that are mass assignable.
+     * The attributes that aren't mass assignable.
      *
      * @var array
      */
-    protected $fillable = [
-        'lecturer_id',
-        'name',
-    ];
+    protected $guarded = [];
 
     /**
      * The attributes that should be cast to native types.

app/Models/Event.php

@@ -10,16 +10,11 @@ class Event extends Model
     use HasFactory;
 
     /**
-     * The attributes that are mass assignable.
+     * The attributes that aren't mass assignable.
      *
      * @var array
      */
-    protected $fillable = [
-        'course_id',
-        'venue_id',
-        'from',
-        'to',
-    ];
+    protected $guarded = [];
 
     /**
      * The attributes that should be cast to native types.

app/Models/Lecturer.php

@@ -10,16 +10,11 @@ class Lecturer extends Model
     use HasFactory;
 
     /**
-     * The attributes that are mass assignable.
+     * The attributes that aren't mass assignable.
      *
      * @var array
      */
-    protected $fillable = [
-        'team_id',
-        'name',
-        'slug',
-        'active',
-    ];
+    protected $guarded = [];
 
     /**
      * The attributes that should be cast to native types.

app/Models/Participant.php

@@ -10,14 +10,11 @@ class Participant extends Model
     use HasFactory;
 
     /**
-     * The attributes that are mass assignable.
+     * The attributes that aren't mass assignable.
      *
      * @var array
      */
-    protected $fillable = [
-        'first_name',
-        'last_name',
-    ];
+    protected $guarded = [];
 
     /**
      * The attributes that should be cast to native types.

app/Models/Registration.php

@@ -10,15 +10,11 @@ class Registration extends Model
     use HasFactory;
 
     /**
-     * The attributes that are mass assignable.
+     * The attributes that aren't mass assignable.
      *
      * @var array
      */
-    protected $fillable = [
-        'event_id',
-        'participant_id',
-        'active',
-    ];
+    protected $guarded = [];
 
     /**
      * The attributes that should be cast to native types.

app/Models/Venue.php

@@ -10,16 +10,11 @@ class Venue extends Model
     use HasFactory;
 
     /**
-     * The attributes that are mass assignable.
+     * The attributes that aren't mass assignable.
      *
      * @var array
      */
-    protected $fillable = [
-        'city_id',
-        'name',
-        'slug',
-        'street',
-    ];
+    protected $guarded = [];
 
     /**
      * The attributes that should be cast to native types.