observers | 易学教程

Laravel observer for pivot table

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I've got a observer that has a update method: ObserverServiceProvider.php public function boot() { Relation::observe(RelationObserver::class); } RelationObserver.php public function updated(Relation $relation) { $this->cache->tags(Relation::class)->flush(); } So when I update a relation in my controller: public function update(Request $request, Relation $relation) { $relation->update($request->all())); return back(); } Everything is working as expected. But now I've got a pivot table. A relation belongsToMany products. So now my controller method looks like this: public function update(Request

Selenium: Watching for a dom event while executing other actions

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问题 Using Selenium I need to validate that an element, as it is dragged across the window, will trigger a 'drop zone' and then release that element in the zone. I can drag the element all over the page, but need to determine when the 'drop zone' element is added to the dom so I know I can release the element. I have looked at 'Mutation Observers' and that would be perfect except the observer does not return until the callback is executed. I can't drag the element around at the same time I am

Observe progress of Data download in Swift?

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问题 I need to cache data that I receive from an remote url to a local URL. I am able to do this successfully with: let dataToCache = try Data(contentsOf: url) try dataToCache.write(to: cacheURL) But I was wondering if there is some type of observer I can use to display a progress view as the data is written? 回答1: Don't use Data(contentsOf: url) to make synchronous request for urls that are not local resources. You should use URLSession .To observe the progress you need to set

Observer for Checkout Start

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Is there an observer in Magento to detect the start of the checkout process? This would include hitting the page checkout/onepage/ or checkout/onestepcheckout/ . I would like to avoid overriding controllers if possible. Every controller action will result in multiple targeted events which are fired in Mage_Core_Controller_Varien_Action (link) , the superclass for all action controllers. These events variously involve the "full action name," derived from module router configuration + controller path + action, as well as the route name which is being requested. In the case of standard onepage

Exact place to register observer in Laravel 4

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问题 When using a separate class for a model observer, where exactly should I register the observer? The documentation says to call User::observe(new UserObserver); but I’m not sure where the best place to do this would be. https://laravel.com/docs/5.4/eloquent#observers 回答1: Since an observer is just a collection of events you are listening to, I'd say place it where Laravel suggests you place individual events: on the boot method of the model itself. class User extends Eloquent { public static

Is removing a NotificationCenter observer that was created with closure syntax by name adequate?

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I have a few notifications that were created using block / trailing closure syntax which look like this: NotificationCenter.default.addObserver(forName: .NSManagedObjectContextObjectsDidChange, object: moc, queue: nil) { note in // implementation } Which I was later removing by name, like this: NotificationCenter.default.removeObserver(self, name: NSNotification.Name.NSManagedObjectContextObjectsDidChange, object: moc) My Question Is this adequate? Or do I absolutely need to save the NSObjectProtocol to it's own property and remove that property with the following syntax? NotificationCenter

Are DOM Mutation Observers slower than DOM Mutation Events?

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问题 The following code utilize DOM Mutation Event DOMNodeInserted to detect the existence of the body element and wrap its innerHTML into a wrapper. <!DOCTYPE html> <html lang="en"> <head> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script> <script> function DOMmanipulation() { if (document.body) { document.removeEventListener('DOMNodeInserted', DOMmanipulation); // DOM manipulation start document.body.innerHTML = '<div class="wrapper">' + document.body

SQLSTATE[HY000]: General error: 2006 MySQL server has gone away on running cron job magento

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I am working on Magento site and I get this error: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away on running cron job magento I only get this error sometimes. <?php class Namespace_Module_Model_Observer { public function importemails(Varien_Event_Observer $observer) { echo "Hi Dear";exit(); /* connect to gmail */ $hostname = '{imap.gmail.com:993/imap/ssl}INBOX'; $username = 'myid@gmail.com'; $password = 'mypass'; /* try to connect */ $inbox = imap_open($hostname,$username,$password) or die('Cannot connect to Gmail: ' . imap_last_error()); /* grab emails */ $emails = imap

In an Observer method, how do you tell Magento to not process code after the dispatched event

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问题 I have some code in the checkout where I set a key in the session if that key is set to false anywhere in the checkout I need to send them back to the billing page. I have the code for it, but I also can't have any of the code that is typically ran after the observer because it will call a third party service and come back as wrong because of this key that is missing in the session Here is my code, I have everything I want but i need the response to happen immediatly and for nothing after the

Return Statement Error using Firebase in Swift

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问题 I made a function that connects to firebase, goes to a specific path and then gives me the value. When I print(snapshot.value), it gives me the value I need. When I call the function, userProfile is empty. I need userProfile to return the snapshot String. func getUserData(uid: String) -> String{ var _REF_USERNAME = FIRDatabase.database().reference().child("users").child(uid).child("profile").child("username") var userProfile = String() _REF_USERNAME.observe(.value, with: {(snapshot) in print(