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app/admin/model/Menu.php

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+<?php
+
+namespace app\admin\model;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Menu extends Model
+{
+    protected $table = 'menus';
+
+    public function children()
+    {
+        return $this->hasMany(Menu::class, 'parent_id')->orderBy('sort');
+    }
+}

app/admin/model/Permission.php

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+<?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');
+    }
+}

app/admin/model/Role.php

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

app/admin/model/User.php

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+<?php
+
+namespace app\admin\model;
+
+use Illuminate\Database\Eloquent\Model;
+class User extends Model
+{
+    protected $table = 'users';
+    protected $hidden = ['password'];
+
+    public function roles()
+    {
+        return $this->belongsToMany(Role::class, 'user_roles', 'user_id', 'role_id');
+    }
+
+    public function hasRole($role)
+    {
+        return $this->roles()->where('name', $role)->exists();
+    }
+
+    public function hasPermission($permission)
+    {
+        return $this->roles()
+            ->whereHas('permissions', function($query) use ($permission) {
+                $query->where('slug', $permission);
+            })
+            ->exists();
+    }
+}