We recommend configuring Selenium's unhandled prompt behavior to { default: 'ignore' } with the monkey patch below. When running tests in a real browser, we use Selenium. Each browser...
...is controlled by a specific driver, e.g. Selenium::WebDriver::Chrome for Chrome. There is one quirk to all drivers (at least those following the W3C webdriver spec) that can be...
...number of different versions for Ruby, Rails and many gems. To be able to switch between projects easily, we must control every dependency our applications has. Goals Understand what a...
...with their dependencies and version history. Bundler overview and workflow How to update a single gem conservatively: A major bundler caveat How to manage versions in a Gemfile
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:
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...
...method for controllers. The most common way is to pass an ActiveRecord instance or scope, and fresh_when will set fitting E-Tag and Last-Modified headers for you. For...
...scopes, an extra query is sent to the database. fresh_when @users If you do not want that magic to happen, e.g. because your scope is expensive to resolve, you...
...can use find and replace with capture groups (.*?) and backreferences $1 (if you have several groups: $[Capture-Group ID]). Named captures (? .*) are also supported. Examples Replace double quotes with single...
If you want to replace double quotes with single quotes, replacing every " with a ' is prone to errors. Regular expressions can help you out here. Open find and replace...
When working with feature branches, stale branches pile up over time. It's best to remove them right after merge, locally and on the remote, but it is a little...
...above). Paste this: #!/bin/bash exec < /dev/tty # Get the current branch name branch_name=$(git branch --show-current) # Get the name of the branch that was just merged reflog_message=$(git...
...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...
...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...
...list icons. Note that it won't work with "text" icons that scale with font-size. Technical background All text has a "baseline". It is the bottom edge of most...
Matching the "space" character class For matching whitespaces in a regular expression, the most common and best-known shorthand expression is probably \s. It matches the following whitespace characters:
...in some cases these may not be good enough for your purpose. Non-breaking spaces (nbsp) Sometimes a text may contain two words separated by a space, but the author...
Any form fields where users enter numbers should be an . Numeric inputs have several benefits over : On mobile or tablet devices, number fields show a special virtual keyboard that shows...
...mostly digit buttons. Decimal values will be formatted using the user's language settings. For example, German users will see 1,23 for . Values in the JavaScript API or when...
View specs are a powerful tool to test several rendering paths by their cases instead of using a more costing feature spec. This is especially useful because they become quite...
...used with Capybara::Node::Finders and Capybara::RSpecMatchers. This allows to wirte view unit specs as you can isolate specific parts of the rendered view and then use readable and...
...However, you need to be aware of the overall transaction nesting constellation, because creating proper sub-transactions can lead to unwanted or too early triggering of after_commit callbacks:
...project> Country.first.name # => "Afghanistan will not change" Wait. What happened to the rollback in the after_save-callback? From the Rails docs: Transaction calls can be nested. By default, this makes...
Slides for Henning's talk on Sep 21st 2017. Understanding sync vs. async control flow Talking to synchronous (or "blocking") API print('script start') html = get('/foo') print(html)
Script outputs 'script start', (long delay), '...
...', 'script end'. Talking to asynchronous (or "evented") API print('script start') get('foo', done: function(html) { print(html) }) print('script end')
Note: Consider using MATE instead of Gnome 3 on newer system Awesome is a very good tiling window manager that provides neat features like automatic layouting of windows, good multi...
Improve your font-rendering Copy /etc/xdg/awesome/rc.lua to ~/.config/awesome/rc.lua. Take a look, it's pretty self-explanatory. You can instantly apply changes by reloading Awesome with Meta-Ctrl-R.
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...
...is hard coded. A popular example is extension_allowlist, which returns an array of strings and let's you only upload files that have a filename with an extension that...
...matches an entry in that array. Another useful validation can be size_range, which gives you a little bit of control over how your storage gets polluted.
This card compares patterns to store trees in a relation database like MySQL or PostgreSQL. Implementation examples are for the ActiveRecord ORM used with Ruby on Rails, but the techniques...
We will be using this example tree (from the acts_as_nested_set docs): root | +-- Child 1 | | | +-- Child 1.1 | | | +-- Child 1.2 | +-- Child 2 | +-- Child 2.1 | +-- Child 2.2
...update your window title whenever you switch directories, simply specify a PROMPT_COMMAND environment variable. set-window-title() { echo -en "\033]0;$(pwd | sed -e "s;^$HOME;~;")\a" } if [[ "$PROMPT...
...COMMAND" ]]; then export PROMPT_COMMAND="$PROMPT_COMMAND;set-window-title" else export PROMPT_COMMAND=set-window-title fi You may put that into your ~/.bashrc to persist and automatically activate...
Stepping forward from JavaScript Basics, the goal of this card is for you to be able to read and write more complex ES6+ code. The JavaScript Object Model
...s also a video of that talk in our internal library. The first three sections of the article Inheritance and the prototype chain on mdn also gives a good introduction...
The maintenance mode is enabled on all application server as soon as the file /public/system/maintenance.html is present. Installation Add this line to your application's Gemfile: gem 'capistrano...
...application's web interface by writing a #{maintenance_basename}.html file to each web server. The servers must be configured to detect the presence of this file, and if it...
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...
...diesen verschiedenen Verbindungsversuchen erklären: nc makandra.de 22 nc ccc.de 22 nc app02-stage.makandra.makandra.de 22 Du kannst Sequence-Numbers erklären Du kennst die Unterschiede zwischen UDP und TCP und kannst Beispiele nennen...
...makandra.de aufbauen und die Datei robots.txt abrufen (Siehe https://richj.co/talking-http-1.1/) Du weisst, was dieser Server-Header bedeutet: Strict-Transport-Security: max-age=31536000 IPv6 Wie werden MAC Adressen bei...
In this card we will learn to write code that scales with a large number of database records. We will do this by pushing work out of Ruby and into...
...a scope of movies matching the following query format: The query is a list of space-separated words that all need to appear in the movie title for the movie...