When you need to add a event listener to hundreds of elements, this might slow down the browser. An alternative is to register an event listener at the root of...
...for events to bubble up and check whether the triggering element (event.target) matches the selector before you run your callback. This technique is called event delegation. Performance considerations
...are using the routing-filter gem in your Rails 7.1 app for managing URL segments for locales or suffixes, you will notice that the filters do no longer apply, routes...
...your controller action. This way you receive a locale parameter from a matching URL segment. Before Rails 7.1, this method returned all associated routes (as enumerable) and the using methods...
...or every even-numbered item. However, :nth-child can do more. In modern CSS specifications (Level 4), there’s an additional feature that lets you use :nth-child in combination...
...with a list of css selectors. This way, you can target the nth-child within a subset of siblings matching a selector. For example: .container .foo %span.my-selector .bar
...on a very good network connection. To test how your application behaves on a slow network (e.g. mobile), you can simulate limited bandwidth. Chrome Open the dev tools (Ctrl+Shift...
...I or F12) and switch to the "Network" tab In the row below the dev tool tabs, there's a throttling dropdown which reads "Online" by default. Inside the dropdown...
...from the app/models folder to the lib/ folder. The approach is applicable to arbitrary scenarios and not limited to API clients. Example Let's say we have a Rails application...
...that synchronizes its users with the Github API: . └── app └── models ├── user │ ├── github_client.rb │ └── sychronizer.rb └── user.rb In this example the app folder contains domain dependent code (user.rb and sychronizer.rb) and domain independent...
...set the Sass options. Webpacker const sassLoaderConfig = environment.loaders.get('sass') const sassLoaderIndex = sassLoaderConfig.use.findIndex(config => { return config.loader === 'sass-loader' }) // Disable deprecation warnings inside dependencies sassLoaderConfig.use[sassLoaderIndex].options.sassOptions.quietDeps = true sassLoaderConfig.use[sassLoaderIndex].options.sassOptions.silenceDeprecations = ['import...
module.exports = { module: { rules: [ { test: /\.s[ac]ss$/i, use: [ "style-loader", "css-loader", { loader: "sass-loader", options: { sassOptions: { quietDeps: true, silenceDeprecations: ['import'], }, }, }, ], }, ], }, }; ESBuild esbuild.build({ // ... plugins: [ sassPlugin({ quietDeps: true, silenceDeprecations...
wkhtmltopdf is deprecated and shouldn't be used anymore. Please consider switching to another tool We can install wkhtmltopdf on your appserver if you need to generate PDF files...
wkhtmltopdf/wkhtmltopdf wkhtmltopdf/packaging Please note: We do not compile the package ourselves on the server. Instead, we install the most recent available version of the prebuilt package. Example:
Whenever you have to deal with randomness in a jasmine test there are some spy strategies to help you out! Let's say we have a method Random.shuffle(array) to...
...shuffle an array randomly and a class that uses shuffle within the constructor. returnValue & returnValues it('shuffles the array', () => { spyOn(Random, 'shuffle').and.returnValue([3, 2, 1])
...to add some custom functionality. This card contains some tips how to achieve this. Setup Basically, follow the guide in the Rails documentation. The automated script may not work with...
...it should be easy to fix. If you don't want the default css shipped with Action Text, you can copy the stylesheet from basecamp's github into your project...
...the test, as if the callback function is not executed in the test. However, since the test does not fail, the method :my_method must have been called during the...
...where the method :my_method should be called This will execute the original implementation (see here...
All major browsers (IE8+, FF3.5+, Safari 4+, any Chrome) support sessionStorage, a JavaScript storage object that survives page reloads and browser restores, but is different per new tab/window (in contrast...
...to localStorage which is shared across all tabs). MDN says: The sessionStorage object is most useful for hanging on to temporary data that should be saved and restored if the...
...for an option like Yarn's --frozen-lockfile which validates that. Here is what seems to be the way to do it. Using npm clean-install Running npm clean-install...
...versions while npm clean-install will complain. You can use npm ci as a shortcut for npm clean-install. Combine with a cache The idea of a "clean install" is...
When using Rails to truncate strings, you may end up with strings that are still too long for their container or are not as long as they could be. You...
...did not use it. Since Firefox 7 you can! Note that this only works for single-line texts. If you want to truncate tests across multiple lines, use a JavaScript...
You have the following HTML structure:
If you want to run Javascript code whenever someone clicks on a ...
..., you can do this in three different ways: function code(event...
...alert("Someone clicked on .my-target!"); } document.addEventListener('click', function(event) { if (event.target.closest('.my-target')) { code(event) } }) document.querySelector('.container').addEventListener('click', function(event) { if (event.target.closest('.my-target')) { code(event) } })
Ever wondered how you can create a simple table output in bash? You can use the tool column for creating a simple table output. Column gives you the possibility to...
...same level. Pipe output to column -t (maybe configure the delimeter with -s) and see the magic happening. detailed example I needed to separate a list of databases and their...
...refactor later. Always add tests on whatever we work on. When you work on something, improve that part of the code. Make sure setup for a new developer is as...
...frictionless as possible (ideally it's bin/setup). Make sure deployment is as frictionless as possible. Setup failure notifications. Set aside some time every month to deal with the most frequent...
...to the public (as it should be!), here's how to open a psql shell inside Kubernetes and connect to the database. Make sure to replace the variables appropriately.
...run postgresql-client \ --image=postgres \ --namespace=$NAMESPACE \ --stdin=true --tty=true \ --rm=true \ --env="PGPASSWORD=$PASSWORD_FOR_POSTGRES \ --command -- \ psql --host=$HOSTNAME_FOR_POSTGRES --username=$USERNAME_FOR_POSTGRES $DATABASE_FOR...
Update: This is now documented on Edgeguides Ruby on Rails: If you set the :validate option to true, then associated objects will be validated whenever you save this...
...default, this is false: associated objects will not be validated when this object is saved. Setup # post.rb class Post < ActiveRecord::Base has_one :attachment end # attachment.rb class Attachment < ActiveRecord::Base...
...they reach approx. 100MB: $ ls -lh log/ -rw-r--r-- 1 user group 55M Sep 15 09:54 development.log -rw-r--r-- 1 user group 101M Aug...
...development.log.0 This behavior is a built-in feature of Ruby's standard Logger class, which Rails uses by default. To control the maximum file size, set config.log_file_size...
For searching in large database tables we usually use PostgreSQL's fulltext search capabilities. While this works reasonably well for content primarily consisting of prose, it is not necessarily a...
...good solution for all use cases. The main issue is that it is only possible to search for prefixes of text tokens, which can potentially be unexpected for users.
...really want to get their arguments processable as keyword arguments. Don't change the syntax, or you'll experience pain. Always call super inside of your overridden #initialize method. A...
...things happen in the ActiveRecord world. Just let them happen, otherwise kittens will die somewhere. You don't want that. Example class Item < ActiveType::Object def initialize(attributes) super
Most of the time, when you are interested in any log output, you see the logs directly on your console or you tail / grep some logfile in a separate terminal...
...In rare cases it's helpful to redirect the Logger output temporary to e.g. STDOUT. Rails.logger = Logger.new(STDOUT) ActiveRecord::Base.logger = Logger.new(STDOUT) User.save! #=> D, [2025-09-08T11...
...main mechanisms for background processing are cronjobs (managed with whenever) job queues, usually with Sidekiq Learn about cronjobs Read HowTo: Add Jobs To cron Under Linux or UNIX? Understand how...
...the load of your application. Decide whether cronjobs should run on one or all servers Note We use the whenever to automatically rewrite the crontab when we deploy. You have...
...t easily customizable. Example usage /slackfont Comic Neue to use "Comic Neue" (if installed) /slackfont system-ui to use your desktop's system font in Slack. /slackfont (without an argument...
...the default font. Some fonts may be unavailable If you installed Slack through Snap, only system-wide installed fonts (i.e. fonts located in /usr/share/fonts/ or /usr/local/share/fonts/) are available.