expect(page).to have_field('Username') { |field| field[:class].blank? } Limitations Using execute_script, evaluate_script or evaluate_async_script within a filter block will crash with a timeout...
...Selenium::WebDriver::Error::ScriptTimeoutError Exception: script timeout This is due to Capybara using a zero timeout while calling the filter block. A workaround is to temporarily set a different timeout...
TL;DR: Rails ships two methods to convert strings to constants, constantize and safe_constantize. Neither is safe for untrusted user input. Before you call either method you must validate...
...the input string against an allowlist. The only difference between the two methods is that unresolvable constants raise an error with constantize, but return nil with safe_constantize. If you...
You can execute systemctl --user --failed to check for failed systemd user units. But let's face it: It's inconvenient and you'll probably miss failures. Better use desktop...
...pipewire.socket ConditionUser=!root [Service] LockPersonality=yes MemoryDenyWriteExecute=yes NoNewPrivileges=yes RestrictNamespaces=yes SystemCallArchitectures=native SystemCallFilter=@system-service Type=simple ExecStart=/usr/bin/pipewire Restart=on-failure Slice=session.slice [Install] Also=pipewire.socket
...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...
...after the current transaction, without defining a model "global" after_commit callback. def do_something update_column(:foo, "bar") send_email(foo: "bar") end The above code is brittle if...
...it's called within a failing transaction: ActiveRecord::Base.transaction do user.do_something raise "oh no, my transaction failed" end In the case above, the database update is lost, but the...
...animate HTML elements using the Web Animation API's method .animate(keyframes, options) (which seems to be Baseline for all browsers since 2022). const fadeIn = [{ opacity: 0 }, { opacity: 1 }] // this...
// the animation object can be used for things like querying timings or state or `pause`, `cancel` the animation animation.pause() animation.play() await animation.finished // do other stuff Even though play...
The attached patch lets you find a record by a string or number in any column: User.find_by_anything('carla') User.find_by_anything('email@domain.de') User.find_by_anything(10023)
User.find_by_anything!('carla') Boolean and binary columns are excluded from the search because that would be crazy. I recommend copying the attachment to features/support/find_by_anything.rb, since it is...
}) Example case I had an Unpoly compiler for a tab navigation, which sets an -active class per default to the first tab link and removes it from all...
...other tab links. If another tab link is clicked, the -active class switches to the clicked link. In a Jasmine spec I wanted to test this behaviour. Unpoly's up.hello...
To return non-HTML responses (like XLS spreadsheets), we usually use the respond_to do |format| format.xls do # send spreadsheet end end This is often, but not always the same...
...one format checks for authorization and the other doesn't. params[:format] is only set when a user explicitly puts a .xls at the end of the URL. The format.xls...
If you want to play music or sounds from a browser, your choice is to use either Flash or the new tag in HTML5. Each method has issues, but depending...
Can play MP3s or Wave files. Cannot play OGG Vorbis audio. Cannot reliably seek to a given position when playing VBR-encoded MP3s. HTML5 audio Is the future, but...
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])
I find it annoying to iterate on a spec that relies on a recorded VCR casette...
...You constantly have to remove the same YAMLs file before you can re-run that still-red test. With this little helper, you (or your coding agent) can do the...
For years we copied the patiently helpers into our test suites. they now live in their own gem (makandra/patiently) where we can test them and distribute changes. Setup
# Gemfile gem "patiently" Replace the vendored boilerplate with a single require: # spec/support/patiently.rb require "patiently/rspec" # includes the helpers into feature + system specs Or include it yourself anywhere: include Patiently...
Tested on Ubunut 22.04 1. Opener script Create a file ~/.local/bin/coverage_zip_opener with: #!/bin/bash tmp_folder="/tmp/coverage-report-opener" if [ -z "$1" ] then echo "Usage: coverage_zip_opener [filename]" exit -1 fi
index_filename=$(find /tmp/coverage-report-opener -name "index.html" | awk '{ print length, $0 }' | sort -n -s | cut -d" " -f2- | head -1) if [ -z "$index_filename" ] then echo "No index file...
...investigate by running that example again using rspec . However, this does not work with shared examples, since Rspec doesn't know in which context the shared example should be run...
...But there is a different way: You can run the shared example using the -e, --example option. It takes a string value and runs all scenarios containing that substring in...
...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...
...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
...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...
...want some output. In Rails > 3.1 you have two methods at hand: announce and say_with_time. In the migration: class AddUserToken < ActiveRecord::Migration class User < ActiveRecod::Base; end
add_column :users, :token, :string announce "now generating tokens" User.find_in_batches do |users| say_with_time "For users ##{users.first.id} to ##{users.last.id}" do users.each do |user| user.update_attribute :token...
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...
Remember How to skip Sprockets asset compile during Capistrano deployment and Automatically skipping asset compilation when assets have not changed? Turns out there is an even better way to speed...
...up Capistrano deployments with asset compilation – and it's even simpler. Adding the asset cache directory to symlinked directories Popular asset managers for Rails are Sprockets and Webpacker. Both keep...
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:
...default order" of rows in database tables. For instance, when you paginate a result set: When using LIMIT, it is important to use an ORDER BY clause that constrains the...
...result rows into a unique order. Otherwise you will get an unpredictable subset of the query's rows. You might be asking for the tenth through twentieth rows, but tenth...
JSON Web Tokens are often times used for authentication delegation from one system to another. They can be decoded for debugging purposes. While most tooling supports decoding base64, JWTs are...
...of type Base64url, which is slightly different and needs to be accounted for. This assumes you already have the JWT in hand, e.g. after scraping it out of an HTTP...