permissions refactoring

app/Models/Project.php

@@ -8,6 +8,7 @@ use Illuminate\Database\Eloquent\Casts\Attribute;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\MorphMany;
 use Illuminate\Support\Str;
 
 #[Fillable(['name', 'key'])]
@@ -16,6 +17,13 @@ class Project extends Model
     /** @use HasFactory<ProjectFactory> */
     use HasFactory;
 
+    protected static function booted(): void
+    {
+        static::deleting(function (self $project): void {
+            $project->permissionAssignments()->delete();
+        });
+    }
+
     protected function key(): Attribute
     {
         return Attribute::make(
@@ -23,6 +31,11 @@ class Project extends Model
         );
     }
 
+    public function permissionAssignments(): MorphMany
+    {
+        return $this->morphMany(PermissionAssignment::class, 'scope');
+    }
+
     public function boardColumns(): HasMany
     {
         return $this->hasMany(BoardColumn::class)