first copies from portal

app/Models/Category.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+
+class Category extends Model
+{
+    protected $connection = 'einundzwanzig';
+
+    /**
+     * The attributes that aren't mass assignable.
+     *
+     * @var array
+     */
+    protected $guarded = [];
+
+    /**
+     * The attributes that should be cast to native types.
+     *
+     * @var array
+     */
+    protected $casts = [
+        'id' => 'integer',
+    ];
+
+    public function courses(): BelongsToMany
+    {
+        return $this->belongsToMany(Course::class);
+    }
+}