This card explains how to generate an entity relationship diagram for your Rails application. We also show how to limit...
Sometimes we write plain SQL queries in migrations so we don't have to mock ActiveRecord classes. These two migrations...
You want to deploy new features but the latest commits are not ready for production? Then use git merge master...
When Capybara locates elements in the DOM, by default it allows only accessing visible elements -- when you are using a...
Sometimes you need to access a dev server running on localhost from another machine that is not part of the...
RSpec Rails can automatically mix in different behaviors to your tests based on their type tag, for example enabling you...
Since Rails 6.1, if we use where.not with multiple attributes, it applies logical NAND (NOT(A) OR NOT(B)) instead...
You can use RSpec::Matchers.define_negated_matcher to define a negated version of an existing matcher. This is particularly useful...
TL;DR When using Cache-Control on a Rails application, make sure the Vary: Accept header is set.
From Exploring ES6: Module imports are hoisted (internally moved to the beginning of the current scope). Therefore, it doesn’t...
Jasmine is a great way to unit test your JavaScript components without writing an expensive end-to-end test for...
A flaky test is a test that is often green, but sometimes red. It may only fail on some PCs...
This RailsCast demonstrated a very convenient method to activate VCR for a spec by simply tagging it with :vcr.
You want to use fields in your applications. However, your desktop users may encounter some weird quirks: Aside from allowing...
Event delegation is a pattern where a container element has a single event listener that handles events for all descendants...
Sometimes a link or input field has no visible label. E.g. a text field with a magnifying glass icon 🔎 and...
git --fixup is very handy to amend a change to a previous commit. You can then autosquash your commits with...
Ruby lets you re-use existing RegExp objects by interpolating it into new patterns: locales_pattern = /de|en|fr|es/i...
With cd .. you can navigate one directory up from the one you are at now. If you use that a...
There is an option you can set so that when using the cd command, small typos are automatically corrected. Add...
It is generally discouraged to load your JavaScript by a tag in the : The reason is that a tag will pause the DOM parser until the script has loaded and executed. This will delay the browser's first contentful paint. A much better default is to load your scripts with a tag: A deferred script has many...
Our gem spreewald supports a few helpers for development. In case you notice errors in your Cucumber tests, you might...
Formerly 301 (Moved Permanently) and 302 (Found) were used for redirecting. Browsers did implement them in different ways, so since...
If you are using scrum in a project you might be familiar with planning poker, a playful way to agree...