Yii Framework 2.0基于角色的访问控制RBAC

学习Yii Framework 2.0我尝试使用Yii 2.0文档中的角色库访问控制。但是指南文件对我来说太短了，我无法完成这项学习。我已经将以下代码添加到我的配置文件中。

'components' => [
    'authManager' => [
        'class' => 'yii'rbac'DbManager',
    ],
],

我已经用下面的sql脚本创建了数据库表。

drop table [auth_assignment];
drop table [auth_item_child];
drop table [auth_item];
drop table [auth_rule];
create table [auth_rule]
(
    [name]  varchar(64) not null,
    [data]  text,
    [created_at]           integer,
    [updated_at]           integer,
    primary key ([name])
);
create table [auth_item]
(
   [name]                 varchar(64) not null,
   [type]                 integer not null,
   [description]          text,
   [rule_name]            varchar(64),
   [data]                 text,
   [created_at]           integer,
   [updated_at]           integer,
   primary key ([name]),
   foreign key ([rule_name]) references [auth_rule] ([name]) on delete set null on update    cascade
);
create index [idx-auth_item-type] on [auth_item] ([type]);
create table [auth_item_child]
(
   [parent]               varchar(64) not null,
   [child]                varchar(64) not null,
   primary key ([parent],[child]),
   foreign key ([parent]) references [auth_item] ([name]) on delete cascade on update cascade,
   foreign key ([child]) references [auth_item] ([name]) on delete cascade on update cascade
);
create table [auth_assignment]
(
   [item_name]            varchar(64) not null,
   [user_id]              varchar(64) not null,
   [created_at]           integer,
   primary key ([item_name], [user_id]),
   foreign key ([item_name]) references [auth_item] ([name]) on delete cascade on update cascade
);

我用以下内容构建了身份验证数据。

class RbacController extends Controller
{
    public function actionInit()
    {
        $auth = Yii::$app->authManager;
        // add "createPost" permission
        $createPost = $auth->createPermission('createPost');
        $createPost->description = 'Create a post';
        $auth->add($createPost);
        // add "updatePost" permission
        $updatePost = $auth->createPermission('updatePost');
        $updatePost->description = 'Update post';
        $auth->add($updatePost);
        // add "author" role and give this role the "createPost" permission
        $author = $auth->createRole('author');
        $auth->add($author);
        $auth->addChild($author, $createPost);
        // add "admin" role and give this role the "updatePost" permission
        // as well as the permissions of the "author" role
        $admin = $auth->createRole('admin');
        $auth->add($admin);
        $auth->addChild($admin, $updatePost);
        $auth->addChild($admin, $author);
        // Assign roles to users. 1 and 2 are IDs returned by IdentityInterface::getId()
        // usually implemented in your User model.
        $auth->assign($author, 2);
        $auth->assign($admin, 1);
    }
}

当通过这个控制器访问这个actionInit（）方法时，上面的数据库表已经填充了基于上面代码的数据。此外，在我的用户表中，我有两个用户，admin用户的id编号为1，author用户的id号为2。我使用以下代码创建一个用户。

public function create()
{
    if ($this->validate()) {
        $user = new User();
        $user->username = $this->username;
        $user->email = $this->email;
        $user->setPassword($this->password);
        $user->generateAuthKey();
        $user->save(false);
        // the following three lines were added:
        $auth = Yii::$app->authManager;
        $authorRole = $auth->getRole('author');
        $auth->assign($authorRole, $user->getId());
        return $user;
    }
    return null;
}

使用以上代码，所有新插入的用户都将是作者。使用下面的if语句，我可以授予或拒绝访问权限。

if ('Yii::$app->user->can('createPost')) {
    // create post
}
if ('Yii::$app->user->can('updatePost')) {
    // update post
}

到目前为止还不错。一切都很好。上面代码的场景是，普通作者可以创建帖子，但不能更新帖子。管理员可以更新帖子，可以做作者能做的一切。现在我希望普通作者能够更新他/她自己的帖子。我不知道如何从这里走得更远。我遵循了Yii指南文档/安全/授权段落基于角色的访问控制（RBAC）。我从未使用过Yii 1。这就是为什么我无法用如此简短的解释Yii2.0文档RBAC。