HTTP header values must only contain low-ASCII (7-bit) characters for safe transport. From RFC 7230: Historically, HTTP has...
Sometimes I ran across a GitHub merge request of a gem where it was not completely obvious in which version...
To retrieve only unique combinations of the selected attributes: You can omit rows, where all selected columns are equal with...
How a macro can dynamically define a method that can be overridden with super in the same class.
After upgrading to Rails 6.1.7.2 one of our apps printed a wall of warnings while booting: /var/www/app/shared/bundle/ruby/2.6.0/gems/net-protocol-0.2.1/lib/net/protocol.rb:68: warning: already...
Using ActiveRecord's #signed_id and .find_signed methods you can create URLs that expire after some time. No conditionals...
When an object is created / updated, various callbacks are executed in this order: before_validation after_validation before_save
Bundler so far ignored the version specified under BUNDLED_WITH in the Gemfile.lock. This had two annoying consequences:
TLDR if you define a equality method for a class you must also implement def hash. Ruby has a lot...
Timecop is a great gem to set the current time in tests. However, it is easy to introduce flakyness to...
We usually rely on VCR and WebMock to prevent any real network connection when running our unit tests.
tl;dr git checkout is the swiss army of git commands. If you prefer a semantically more meaningful command for...
tl;dr In RubyMine you can use find and replace with capture groups (.*?) and backreferences $1 (if you have several...
Ruby's standard library includes a class for creating temporary directories. Similar to Tempfile it creates a unique directory name...
A memory leak is an unintentional, uncontrolled, and unending increase in memory usage. No matter how small, eventually, a leak...
If you need to convert an SVG source to PS or EPS, the most common suggestion on the interwebs is...
Greg Molnar has written a neat article about creating a single-file Rails app. This is not meant for production...
When your Rails application offers downloading a bunch of files as ZIP archive, you basically have two options:
The linked content includes a few design patterns implemented with Ruby on Rails. What is the card indented to achieve...
These are the results of the "personal tech stack survey". I've included only the most popular mentions, maybe it...
This should be fixed in the latest LTS-branches of our mysql2 fork, 0.2.x-lts and 0.3.x-lts...
Ruby includes many standard gems that are bundled into the Ruby installation. Here is an example for the gem strscan...
Somewhat regularly, you will need to filter a list down to some items and then map them to another value...
Testing file download links in an end-to-end test can be painful, especially with Selenium. The attached download_helpers.rb provides...