When an object is created / updated, various callbacks are executed in this order: before_validation after_validation before_save
We had a strange behaviour on one of our mariadb-servers: Everyday at around midnight we saw that the root...
When changing glibc versions, it's possible to end up with corrupt indexes in PostgreSQL. Are My Indexes Affected?
When changing the glibc version, it's possible that the upgrade also includes changes to how locales work.
The Oracle mysql client has an odd behavior if your server uses latin1 as default character-set-server. Command
Erfülle die Aufgaben Zeige deinem Mentor in einer Live-Demo was du umgesetzt hast. Wenn du Aufgabe 4 betrachtest...
You might use screen or tmux to run a temporary command on a server which continues to run after the...
The owner of a scheduled CI/CD pipeline in GitLab will always be notified if the pipeline fails. Follow these steps...
If you're frequently switching between projects, you might be annoyed by RubyMines behavior of opening the last project on...
Wir arbeiten in einem Umfeld in dem sich fast alles um das Web und HTTP dreht. Wir betreiben Webseiten und...
Der zuverlässige und perfomante Betrieb von relationalen Datenbanken kann sehr aufwendig und komplex sein. Dies gilt vor allem, wenn man...
If you're experiencing that your bundle install command fails with an error message like this, rubygems.org might...
Unpoly's [up-observe], [up-autosubmit] and [up-validate] as well as their programmatic variants up.observe() and up.autosubmit...
tl;dr Since Rails 7+ you can use ComparisonValidator for validations like greater_than, less_than, etc. on dates, numerics...
tl;dr git checkout is the swiss army of git commands. If you prefer a semantically more meaningful command for...
The robots.txt file and HTML tag can be used to control the behavior of search engine crawlers. Both have different...
For Rails models where only one of multiple attributes may be filled out at the same time, there is no...
Greg Molnar has written a neat article about creating a single-file Rails app. This is not meant for production...
This should be fixed in the latest LTS-branches of our mysql2 fork, 0.2.x-lts and 0.3.x-lts...
When paginating records, we usually need to know the number of total records in order to render pagination links. Popular...
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...
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