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])
You need to update a lof gems. Make sure you don't have any version constraints in your Gemfile or your bundle update won't do anything!
...cucumber_priority: bundle update cucumber_priority Upgrade spreewald: bundle update spreewald Upgrade cucumber_factory: bundle update cucumber_factory Upgrade parallel_tests: bundle update parallel_tests Even on the latest version...
...hints on best practices to maintain your tasks in larger projects. Rake Tasks vs. Scripts The Rails default is using rake tasks for your application tasks. These live in lib/tasks...
...case you want to avoid rake for your tasks and just use plain ruby scripts, consider lib/scripts/* as folder. Keeping tasks slim For readability and testing it's easier to...
YJIT is Ruby's default just-in-time compiler. It is considered production-ready since Ruby 3.2 (source). To activate YJIT you need two steps: Your ruby binary needs to...
...be compiled with YJIT support. You need to enable YJIT. Getting a Ruby with YJIT support We usually install Ruby with tools like rbenv or asdf. This compiles the ruby...
In long diffs, it can become impossible to spot small changes in larger blocks of moved code. This may be either a method that was moved from the top to...
...the bottom of a file, or a long test file that was split in many. Fortunately, Git offers a special highlighting mode that directs the reader's attention to relevant...
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...
...and how to normalize them. In the example below, the Movie#title attribute is stripped from leading and trailing whitespace automatically: class Movie < ApplicationRecord normalizes :title, with: -> { _1.strip } end
...a class. Which could look like this: class Movie < ApplicationRecord normalizes :title, with: Normalizers::StripNormalizer end The with keyword accepts any callable object that takes the attribute’s value as...
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...
...with information from an associated table, you can JOIN the associated table into the statement. Example Let's say you have a database schema where an Employee belongs_to :department...
Now you need to backfill existing Employee records with the new department_name. Since the department's name lives in another table, you need to JOIN both tables during...
Sometimes it's nice to have some coloring in your logs for better readability. You can output your logs via tail and pipe this through sed to add ANSI color...
...containing "FATAL" in red and all lines with "INFO" in green: tail -f /path/to/log | sed --unbuffered -e 's/\(.*INFO.*\)/\o033[32m\1\o033[39m/' -e 's/\(.*FATAL.*\)/\o033[31m...
...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...
...driver_opts directly. However, this is deprecated and will be removed in version 4 of selenium-webdriver. Version 5.x will drop support for passing the service options as hash...
...Option 2: Connect tests to a manually started chromedriver Warning This does not work with selenium-webdriver > 4 anymore. You can pass in a specific port as attribute of the...
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...
The benefit of the Rails asset pipeline is that it compiles your stylesheets and javascripts to a single file, respectively. However, the consequences are startling if you don't understand...
...all your asset libraries in the same folder, which quickly becomes confusing as your set of assets grows. To overcome this, we have two different solutions. Custom solution
Option 1: Creating a self-signed certificate with the openssl binary As igalic commented on this gist. openssl req -new -newkey rsa:2048 -sha256 -days 365 -nodes -x509 -keyout server.key...
make it an X.509 certificate, not a Certificate Signing Request. Option 2: Creating a self-signed certificate with the mkcert binary The linked tool mkcert helps you to setup...
If you're using a Redis cache in Rails (e.g. :redis_cache_store), it's possible to configure additional parameters for your Redis connection. Example config for Rails 7.2
...store = :redis_cache_store, { pool: { timeout: 0.5 }, read_timeout: 0.2, # default 1 second write_timeout: 0.2, # default 1 second # Attempt two reconnects with some wait time in between reconnect_attempts...
This guide shows how to create an AngularJS application that consumes more and more memory until, eventually, the browser process crashes on your users. Although this guide has been written...
...for Angular 1 originally, most of the advice is relevant for all client-side JavaScript code. How to observe memory consumption To inspect the amount of memory consumed by your...
...loading associations. By preloading associations you can prevent the n+1 query problem that slows down a many index view. You might have noticed that using :include randomly seems to...
...involved table with a condition like...
...WHERE id IN (123, 125, 170). Execute a single query for a huge table joined from all involved tables. ActiveRecord prefers option 1, probably...
...not necessary to add a version constraint next to your packages in the package.json. Since all versions are saved in a lockfile, everyone running yarn install will get exactly the...
...within the yarn install command: Before: unpoly@^2.7.2: version "2.7.2" resolved "https://registry.yarnpkg.com/unpoly/-/unpoly-2.7.2.tgz#55044c08bce0984c000f7cd32450af39271727de" integrity sha512-jfBbBRBQMCZZcNS6fckKpFunfdiTDBXW8yxRKqLs09jSrYYUDPd+YuyDoXjABXOro0aDUIMcmyTc7moc1/Z5Tw== After: unpoly@x: version "2.7.2" resolved "https://registry.yarnpkg.com/unpoly/-/unpoly-2.7.2.tgz#55044c08bce0984c000f7cd32450af39271727de" integrity sha512-jfBbBRBQMCZZcNS6fckKpFunfdiTDBXW8yxRKqLs09jSrYYUDPd...
...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...
...Before merging back: reinstate reverted features in a temporary branch, then merge that branch. Scenario Consider your team has been working on several features in a branch, made many changes...
...fix them, if necessary. Maybe tests were added that expect the removed functionality as a side-effect. Merge the master into your branch regularly, especially when you have multiple teams...
...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...
Sometimes the need arises for SSL in local development. We have guides for different webservers, this one is for puma. make sure mkcert is installed create an SSL certificate for...
...bundle exec rails s Accept the certificate in your browser See also Creating a self-signed certificate for local HTTPS development
...use heredoc to avoid endlessly long lines of code that nobody can read. Heredoc strings preserve linebreaks and can be used like this: def long_message puts(<<-EOT)
...a very long message... Sincerely, foobear EOT end <<-EOT will be somewhat of a placeholder: anything you write in the line after you used it will be its value until...