When working with feature branches, stale branches pile up over time. It's best to remove them right after merge, locally and on the remote, but it is a little...
...above). Paste this: #!/bin/bash exec < /dev/tty # Get the current branch name branch_name=$(git branch --show-current) # Get the name of the branch that was just merged reflog_message=$(git...
Note: Modern Rails has two build pipelines, the asset pipeline (or "Sprockets") and Webpacker. The principles below apply for both, but the examples shown are for Sprockets.
...your application uses many assets, such as images, javascripts and stylesheets. Without your intervention, the browser will request these assets again and again on every request. There is no magic...
...external commands from within Ruby, but the most powerful ones are Open3.capture3 and Open3.popen3. Since those can do almost everything you would possibly need in a clean way, I prefer...
...to simply always use them. Behind the scenes, Open3 actually just uses Ruby's spawn command, but gives you a much better API. Open3.capture3 Basic usage is require 'open3'
...line goes from baseline up to the capital top. That's because text usually starts with a capital letter, plus descenders are far less frequent than ascenders.
...center an icon (or any "blockish" inline element, really) with the capital letters of surrounding text. This works well with our modern approach to SVG icons, or e.g. for custom...
When testing JavaScript functionality in Selenium (E2E), you may need to access a class or function inside of a evaluate_script block in one of your steps. Capybara may only...
...your tests (and neither in the dev console). The following principles/concepts also apply to Sprockets. Say we have a StreetMap class: // street_map.js class StreetMap { function getLatitude() { // ... } function renderOn(mapElement) { // ... } }
Spreewald comes with a selector_for helper that matches an English term like the user's profile into a CSS selector. This is useful for steps that refer to a...
...particular section of the page, like the following: Then I should see "Bruce" within the user's profile ^^^^^^^^^^^^^^^^^^ If you're too lazy to manually translate English to a CSS...
I was recently asked to optimize the response time of a notoriously slow JSON API endpoint that was backed by a Rails application. While every existing app will have different...
...be used to reproduce the results. I tried to mimic the case where things started out fast but did not scale well: There is an existing Rails App with a...
Code splitting is a feature of esbuild that can keep huge libraries out of the main bundle. How code splitting works Like Webpack esbuild lets you use the await import...
...code on demand: // application.js const { fun } = await import('library.js') fun() However, esbuild's code splitting is disabled by default. The code above would simply inline (copy) library.js into application.js:
For my computer science bachelor's thesis I programmed and evaluated a CLI Test Case Prioritization (TCP) tool for makandra. It has been written as a Ruby Gem and was...
...as T2 > T3> T1 > T4 > T5 > T6. Selection of a strategy In the preselection coverage-, search-based, model- and combinations of different prioritization methods. History- and fault-based approaches could...
...be answered with an empty response if the underlying content hasn't changed. This saves CPU time and reduces the bandwidth cost for a request/response exchange to about 1 KB...
...can be considered secure. Random masking of CSRF tokens was introduced to mitigate BREACH, a side-channel attack against HTTPS that was published in 2013. BREACH is pretty hard to...
I recently stumbled upon the Rails feature composed_of. One of our applications dealt with a lot of addresses and they were implemented as 7 separate columns in the DB...
...and Rails models. This seemed like a perfect use case to try out this feature. TLDR The feature is still a VERY leaky abstraction. I ran into a lot of...
Let's say you have a gem which has the following module: # within the imaginary super gem module SuperClient def self.foo 'Foo' end def bar 'Bar' end end
...library extensions). Try to avoid it if possible. Add a lib/ext/super_client.rb to your project (see How to organize monkey patches in Ruby on Rails projects) Add the extension, which overrides...
...operators typeof and instanceof which work very differently. JavaScript has some primitive types, like string literals, that are not objects (as opposed to Ruby, where every value is an object...
...Some values are sometimes a primitive value (e.g. "foo") and sometimes an object (new String("foo")) and each form requires different checks There are three different types for null (null...
...rails_performance (https://github.com/igorkasyanchuk/rails_performance) provides a lot of valuable information with very little setup cost. It only needs Redis which we use in the majority of our applications anyway...
Only problematic requests (> 500 ms) Longer history than "Recent requests" The "500 Errors" screen self-explanatory and hopefully always empty The "Custom Events" screen Let's you easily add...
Rails supports time zones, but there are several pitfalls. Most importantly because Time.now and Time.current are completely different things and code from gems might use one or the other.
Your life will be easier if your application does not need to support time zones. Disable them like this: config.time_zone = 'Berlin' # Your local time zone config.active_record.default_timezone...
Is your application doing something expensive every few seconds? Maybe an animated slider that rotates images? Maybe you are updating data over the network every five minutes? It's a...
...this if the your document tab is not even visible to the user. This saves your user's battery and data plan. You can ask document.visibilityState or document.hidden whether this...
Here is a bash script that I use to auto-configure displays on Ubuntu 24.04 with Xorg. Background Ubuntu always sets the primary display to the 1st (i.e. internal) display...
...bottom-aligned (the default would be aligned at their top edges). As an oddly specific bonus (you may not need this), I adjust my internal display's resolution when connected...
...HTML's accepts a single file. You can allow multiple files via . But sometimes, selecting multiple files is not enough and can be cumbersome for the user. Enter webkitdirectory:
...webkitdirectory switches the browser's file picker to select a directory. All files inside that directory, and inside any nested subdirectories, will be selected for the file input.
...status code 400) |_http-title: 400 The plain HTTP request was sent to HTTPS port | ssl-cert: Subject: commonName=www.makandracards.com/countryName=DE | Not valid before: 2015-10-14T12...
...Not valid after: 2016-10-14T12:42:03+00:00 |_ssl-date: 2016-08-05T11:33:52+00:00; +9d23h48m18s from local time. | tls-nextprotoneg: | h2
The git doc states on the difference of these two commands: git-restore[1] is about restoring files in the working tree from either the index or another commit. This...
...The command can also be used to restore the content in the index with --staged, or restore both the working tree and the index with --staged --worktree. By default, if...
...method to automatically compute an ETag from the given record, array of records or scope of records: class UsersController < ApplicationController def show @user = User.find(params[:id]) fresh_when @user
...by passing an array of ETaggable objects to fresh_when. class UsersController < ApplicationController def show @user = User.find(params[:id]) # The show template also renders the user's posts. fresh_when...
Embedding videos on a website is very easy, add a tag to your source code and it just works. Most of the time. The thing is: Both the operating...
...an 0.x version and has quite some development dependencies. It has the Apache license. streamio-ffmpeg seems to be perfect, but had its last release in 2016. It offers...
...consider processing your images with libvips instead of ImageMagick. Reasons for libvips There are several upsides to using libvips over ImageMagick: libvips is considerably faster and uses less memory.
...has a large attack surface that has repeatedly caused security incidents in the past (compare ImageMagick CVEs with libvips CVEs). Ubuntu is sometimes slow to fix the numerous ImageMagick vulnerabilities...
Most forms have a single submit button that will save the record when pressed. Sometimes a form needs additional submit buttons like "accept" or "reject". Such buttons usually attempt...
...a state transition while updating the record. To process a form with multiple buttons, your server-side code will need to know which button was pressed. To do so you...