Hi,
I am try implementation RBAC, using DbManager.
http://www.yiiframework.com/doc-2.0/guide-security-authorization.html#rbac
But when trying to verify access with:
if (\Yii::$app->user->can('createPost')) {
// create post
}
Show this error:
Call to a member function checkAccess() on a non-object
How do I find out the cause of the problem?
Yhanks
Could you show us the stack traces?
I’m sorry, but I’m newbie 
What is "stack trace" and how do I get it?
This is my page error:
PHP Fatal Error – yii\base\ErrorException
Call to a member function checkAccess() on a non-object
1. in C:\Wamp\www\basic\vendor\yiisoft\yii2\web\User.php at line 661
652653654655656657658659660661662663664665666667668669670
* [[\yii\rbac\ManagerInterface::checkAccess()]] to obtain the up-to-date access result. Note that this
* caching is effective only within the same request and only works when `$params = []`.
* @return boolean whether the user can perform the operation as specified by the given permission.
*/
public function can($permissionName, $params = [], $allowCaching = true)
{
if ($allowCaching && empty($params) && isset($this->_access[$permissionName])) {
return $this->_access[$permissionName];
}
$access = $this->getAuthManager()->checkAccess($this->getId(), $permissionName, $params);
if ($allowCaching && empty($params)) {
$this->_access[$permissionName] = $access;
}
return $access;
}
/**
* Returns auth manager associated with the user component.
2. in C:\Wamp\www\basic\vendor\yiisoft\yii2\base\InlineAction.php at line 55 – app\controllers\PostController::actionCreate()
3. in C:\Wamp\www\basic\vendor\yiisoft\yii2\base\InlineAction.php at line 55 – call_user_func_array:{C:\Wamp\www\basic\vendor\yiisoft\yii2\base\InlineAction.php:55}()
4. in C:\Wamp\www\basic\vendor\yiisoft\yii2\base\Controller.php at line 151 – yii\base\InlineAction::runWithParams()
5. in C:\Wamp\www\basic\vendor\yiisoft\yii2\base\Module.php at line 455 – yii\base\Controller::runAction()
6. in C:\Wamp\www\basic\vendor\yiisoft\yii2\web\Application.php at line 84 – yii\base\Module::runAction()
7. in C:\Wamp\www\basic\vendor\yiisoft\yii2\base\Application.php at line 375 – yii\web\Application::handleRequest()
8. in C:\Wamp\www\basic\web\index.php at line 12 – yii\base\Application::run()
6789101112
require(__DIR__ . '/../vendor/autoload.php');
require(__DIR__ . '/../vendor/yiisoft/yii2/Yii.php');
$config = require(__DIR__ . '/../config/web.php');
(new yii\web\Application($config))->run();
check once main.php file, these lines are available or not.
I am get same error because of this.
return [
'components' => [
'authManager' => [
'class' => 'yii\rbac\DbManager',
],
],
];
You got it and showed it.
It enables you to locate the exact place where the error occurred.
The following are the important lines:
It tells that "$this->getAuthManager()" returned null.
As @ilaiya has suggested, it seems like that you have not configured the auth manager correctly.
Exactly!
'authManager' => [
'class' => 'yii\rbac\DbManager',
],
I had put this in "config/console.php" had to be in "config/web.php".