Somewhat regularly, you will need to filter a list down to some items and then map them to another value...
I recently wanted to add a model for address information but also wanted to add a unique index to those...
Imagine these models and associations: class Deck < ApplicationRecord has_many :cards end class Card < ApplicationRecord belongs_to :deck, optional: true...
When changing code in mailers, updating the corresponding mailer preview can be forgotten very easily. Mailer previews can be tested...
When redirecting you should take care to use the right HTTP status code. From controllers When redirecting from a controller...
Recent IRB versions include a multi-line autocomplete which may be helpful to novice users but can be distracting.
It might sometimes be useful to check whether your Rails application accesses the file system unnecessarily, for example if your...
Testing file download links in an end-to-end test can be painful, especially with Selenium. The attached download_helpers.rb provides...
If you get an error message like this: You have already activated some-gem 1.2.3, but your Gemfile requires some...
While verifying doubles in RSpec is a good default, it is limited in the amount of methods it actually is...
I recently had the problem that embedded code boxes crashed my layout. It turned out that pres break out of...
tl;dr With ES2021 you now can use str.replaceAll(), Promise.any(), logical assignment operators, numeric separators and WeakRef on all major...
Code quality can be measured in four levels: (Working code) Reliable code (minimum) Readable code (ok for short-lived code...
Der Begriff systemd wird immer umfassender da es sich nicht mehr (wie ursprünglich) nur um ein init Systemd handelt, sondern...
Linux Kernel Parameter werden üblicherweise schon zur Compile und Startzeit mit brauchbaren Default-Werten geliefert. Allerdings muss man, je nach...
You'll need openssl-3 or newer for servers running 22.04 Ruby version 3.1 uses by default the gem openssl...
Unter Linux gibt es mehrere Dateisysteme. Es ist gut einen Überblick zu haben welche existieren und wie man die Dateisysteme...
In diesem Kapitel wollen wir uns die Struktur des Linux Dateisystems ansehen. Damit ist in diesem Fall nicht das Dateisystem...
When you are working with SVG files and ImageMagick you can get different results on different machines depending on which...
There is a way to use multiple databases in Rails. You may have asked yourself how you're able to...
tl;dr You can use attribute? as shorthanded version of attribute.present?, except for numeric attributes and associations. Technical Details
The gemspec for gems allows to add metadata to your gem, some of which have a special meaning and are...
You can use Unpoly's up.on with a named listener function and immediately unbind this event listener with { once: true...
In Chrome DevTools you can use getEventListeners(object) to get a list of registered event listeners on the specified object...