In October 2019, I was able to present a talk at the annual sfday, the Italian conference about Symfony. The main focus of my presentation was how we handle Doctrine in our setup which includes both master-slave and sharding, something we felt was quite uncommon and worthy of presenting. A…
Symfony
This article describes, from an infrastructural point of view, how to use together the doctrine sharding and Amazon Aurora Autoscaling, on our databases. Nuvola is our main project, which allows Italian schools to manage their activities in a computerized way. Nuvola is a multi-tenant application. In the past we have…
The usual way of defining a controller in a default Symfony installation is by placing it in the src/Controller directory, but there might be situations where you just don’t want to do that. For instance, if you’re using some sort of domain-driven design and want to organize your project according…
In this article we’re gonna talk about composition over inheritance but not approaching this topic from a theoretical point of view (you can find dozens of good articles online by googling the topic), but instead by providing an example of something that in literature is a well-know pattern: Template Method….
Tagged services Per indicare che un servizio svolge un particolare ruolo in Symfony è possibile configurarlo aggiungendo uno o più tags alla sua definizione. Per esempio, etichettando un servizio con il tag twig.extension si indica a Symfony che il servizio deve essere trattato come una estensione di twig. Questo meccanismo…
There are various types of code reuse in Twig but, what are the differences between them? In this article we’ll explore the differences between include, embed and macro. First of all, some definitions from the documentation: The include statement includes a template and returns the rendered content of that file…
Con la versione 3.3, Symfony ha introdotto l’autowrire e l’autoconfigure dei servizi, risparmiando a noi developer parecchio lavoro “noioso”. Spesso capita di dovere iniettare un repository Doctrine: out of the box non è possibile farlo. Di default infatti i repository non sono dichiarati come servizi e non sono quindi utilizzabili…
Capita di voler utilizzare Redis per memorizzare informazioni non fondamentali o che possono essere rigenerate anche nel caso non fossero accessibili.In questi casi se il server Redis dovesse non essere disponibile per un qualsiasi problema, il nostro servizio sarebbe completamente interrotto pur essendo funzionanti tutti i sistemi necessari ad erogarlo.Questo…
The problem When a software handles multiple concurrent operations an entire class of problems arises. In our case multiple requests would try to update centralized information leading to unique constraint violations at the database level. That was because the code would check if an entity to update already existed and…
You all, at some point, faced the necessity to compare old and new values when storing an entity. Here is where Doctrine EntityListener comes at help. Let imagine you have this User entity
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<?php namespace App/Entity; class User { /** @var string $email */ private $email; public function getEmail(): string { return $this->email; } } |
and you want to notify the user when the email address has been changed. All you…