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app/admin/model/Permission.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace app\admin\model;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Permission extends Model
+{
+    protected $table = 'permissions';
+
+    public function roles()
+    {
+        return $this->belongsToMany(Role::class, 'role_permissions', 'permission_id', 'role_id');
+    }
+}