Updated FilamentType Model

app/Models/FilamentType.php

@@ -7,9 +7,16 @@ use Illuminate\Database\Eloquent\Model;
 class FilamentType extends Model
 {
     protected $table = 'filament_types';
+    protected $primaryKey = 'id';
 
     protected $fillable = [
         'name',
         'description',
     ];
+
+    // FilamentType has many filaments
+    public function filaments()
+    {
+        return $this->hasMany(Filament::class);
+    }
 }