Geoffrey Roguelon

[groguelon-blog]

Opal: Ruby in Your Browser, the Basics

I love Ruby, and it is my go-to language for building web applications. Unfortunately, when dealing with the browser, Javascript is a necessary evil. As you can see, I am not a huge fan. So when someone comes along offering a way to use Ruby on the browser, sign me up!

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Unleash the power of storing JSON in Postgres - via @codeship

You can use Postgres as a JSON document store in your Rails app without leaving the relational world behind. Check out how!

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Following a Select Statement Through Postgres Internals

Find out for yourself how Postgres works internally. Learn what a postgres server does when it receives select statements and how it understands SQL.

[groguelon-blog]

What challenges to avoid when migrating to Docker

The first issue with Docker is that Boot2Docker is such a great tool that you forget that you're not running on your own machine.

[groguelon-blog]

Discover how the Rails sessions work.

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Internationaliser les enum Rails 4.1, faut-il utiliser les helpers ?

Rails 4.1 a introduit la feature tant demandée et attendue des enum, qui permet de limiter un attribut donné à quelques valeurs textuelles qu’il peut prendre.Cette feature a tant tardé, car peu de...

[groguelon-blog]

Discover how to tune your GC settings in order to improve your application's performances.

[groguelon-blog]

When limit(1).first is orders of magnitude slower than limit(1)[0] in Rails.

A comparaison of ActiveRecord methods with significant speed differences.

By Jeremy Walker

[groguelon-blog]

Ruby String.split("") vs String.chars

J'ai pris l'habitude d'utiliser String.split(''), pour travailler avec les méthodes liées aux tableaux sur une chaîne de caractères. Mais après un benchmark (Benchmark-IPS) avec la méthode String.c...

[groguelon-blog]

Access the Rails server from a different machine

In Ruby on Rails 4.2, by default, you can't access from a different machine to the Rais server.

The reason is Rack has introduced a change which block that.

If you need to demonstrate from another machine, you can change the binding in starting the Rails server with help of the below command:

rails s -b 0.0.0.0

Source: Ruby on Rails 4.2 release notes

[groguelon-blog]

We will explain how to search elements by location with Geocoder.

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[groguelon-blog]

[groguelon-blog]

Comprendre le protocole OAuth2, son rôle, ses types d'autorisation, les tokens et les mesures de sécurité à prendre côté client et côté serveur.

[groguelon-blog]

How to install Ruby 2.2.0 with jemalloc support with RBenv

Ruby 2.2.0 is out!

Ruby 2.2.0 includes the experimental support of jemalloc via this option:

configure --with-jemalloc

If you use RBenv to manage your Ruby versions, you can take advantage of jemalloc specifying the right option during the setup process.

To do that, use this command to install Ruby 2.2.0 and RBenv (ruby-build plugin):

RUBY_CONFIGURE_OPTS=--with-jemalloc rbenv install 2.2.0

Using jemalloc, you can reduce up to 10% the request time.

UPDATE:

Don't forget to install jemalloc with Homebrew:

brew install jemalloc

[groguelon-blog]

Default values in using scope

Some time ago, I discovered we can use the scope to set default values in a new model.

For instance:

class Product scope :published, -> { where(published: true) } scope :not_published, -> { where(published: false) } end Product.new #=> #<Product id: nil, published: nil> Product.published #=> #<ActiveRecord::Relation []> Product.published.new #=> #<Product id: nil, published: true> Product.not_published.new #=> #<Product id: nil, published: false>

As you can see, the published attribute takes the value used in the scope.

This feature is available since Rails 2.3.x.

[groguelon-blog]

Alexander Danilenko explains the difference between the different classes Date, DateTime and Time available in Ruby on Rails.