Rails partials have a lot of "hidden" features and this card describes some non-obvious usages of Rails Partials.
Not all email clients support external images in all situations, e.g. an image within a link. In some cases, a...
Carrierwave's BaseUploader can have some validations that you can use by overriding a certain method, which's expected name...
Since Rails 7 you are able to encrypt database information with Active Record. Using Active Record Encryption will store an...
Sometimes I ran across a GitHub merge request of a gem where it was not completely obvious in which version...
To retrieve only unique combinations of the selected attributes: You can omit rows, where all selected columns are equal with...
Das Standardtool für Monitoring auf AWS ist Cloudwatch. Du hast dir in den AWS Kapiteln Cloudwatch sicherlich schon grundsätzlich angesehen...
Du verstehst was eine Custom Resource ist und warum das nützlich sein kann. Du weißt, was ein Operator ist...
Rails includes milliseconds in Time / DateTime objects when rendering them as JSON: JSON.parse(User.last.to_json)['created_at'] #=> "2001-01-01...
Im Kapitel 502 Eine Applikation als Container mit CI pipelines deployen hast du eine Applikation auf AWS deployed. In diesem...
Sometimes, the rails dev server doesn't terminate properly. This can for example happen when the dev server runs in...
If you have for e.g. a Java application which outputs multiline stack traces inside a container running in kubernetes you...
Let's assume that we have a model Movie that registers a callback function when a new instance of Movie...
I recently enjoyed debugging a Cucumber step that tried to be retryable using a patiently block: Then /^"([^"]*)" should( not)? be...
Mit SQL spricht man mit relationalen Datenbanken. Ziele Verstehe die folgenden SQL Befehle SELECT WHERE ORDER INNER JOIN, LEFT JOIN...
When an object is created / updated, various callbacks are executed in this order: before_validation after_validation before_save
To delete a specific redis-DB you need to use the FLUSHDB-command in combination with the SELECT-command. For...
In dieser Card geht es um Netzwerke in Kubernetes. Schau noch einmal kurz auf Netzwerke zurück und schau dir die...
TLDR if you define a equality method for a class you must also implement def hash. Ruby has a lot...
In diesem Kapitel wirst du eine Applikation in ein Containerimage verpacken und dieses via CI/CD bauen. Anschließend baust du die...
Timecop is a great gem to set the current time in tests. However, it is easy to introduce flakyness to...
You can execute systemctl --user --failed to check for failed systemd user units. But let's face it: It's...
In a Jasmine spec you want to spy on a function that is imported by the code under test. This...
To measure the time of your HTTP request with curl, you can use the -w (--write-out) option: