Laravel 5 View Error Bags: Determining if a Message Bag Exists With hasBag

The hasBag method is used to determine if a MessageBag instance exists within the ViewErrorBag instance with the given $key. The $key is set to default unless it is changed. The following example will highlight the usage of the hasBag method.

#Signature

The signature of the hasBag method is:

1public function hasBag(
2    $key = 'default'
3);

#Example Use

The following example demonstrates the usage of the hasBag method is:

 1use Illuminate\Support\ViewErrorBag;
 2use Illuminate\Support\MessageBag;
 3 
 4// Create a new ViewErrorBag instance.
 5$viewErrorBag = new ViewErrorBag;
 6 
 7// Check if the 'default' MessageBag instance
 8// exists.
 9//
10// false
11$doesExist = $viewErrorBag->hasBag();
12$doesExist = $viewErrorBag->hasBag('default');
13 
14// Check if a 'payments' MessageBag instance
15// exists.
16//
17// false
18$doesExist = $viewErrorBag->hasBag('payments');
19 
20// Add a new 'payments' MessageBag instance.
21$viewErrorBag->put('payments', new MessageBag);
22 
23// Check again if the 'payments' MessageBag instance
24// exists.
25//
26// true
27$doesExist = $viewErrorBag->hasBag('payments');

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