On Ruby 1.9+, standard ruby character classes like \w, \d will only match 7-Bit ASCII characters: "foo" =~ /\w+/ # matches...
Braces and do/end are completely swappable—almost all the time. They have different precedence. It’s not often that anyone...
We already have some approaches on how to test file downloads withe selenium. Nonetheless here is another approach, which inspects...
In Rails, we usually have a mailer setup like this: class MyMailer < ActionMailer::Base def newsletter mail to: 'receiver@host.tld',
Localizing a non-trivial application can be a huge undertaking. This card will give you an overview over the many...
Collection of useful tools in the Chrome JavaScript console. Make the whole page editable This is not special to Chrome...
Pour color on your Rails console with awesome_print. Turn confusing long strings into formatted output. Have objects and classes...
Cucumber has an output format that prints step definitions only. You can use this to find unused ones: Temporarily add...
We figured out, that ActiveJob Inline might lead to autoloading problems in development. The result was an exception when running...
When building a web application, one is tempted to claim it "done" too early. Make sure you check this list...
Ubuntu has decided to disable PDF processing because ImageMagick and the underlying Ghostscript had several security issues. When your Ghostscript...
draw.io is a web application that lets you draw flow charts and other diagrams. It works much nicer than office...
In this example we assume that not only the storage gem changes but also the file structure on disc.
TL;DR Debugging problems with javascript errors in cucumber tests is sometimes easier in the browser. Run the test, stop...
In Ruby, classes and modules are called constants. This card explains how Ruby resolves the meaning of a constant.
Browsers' printing methods usually don't print background colors. In most cases this is the desired behavior, because you don...
Sometimes, the IRB prints a warning during boot: irb: warn: can't alias source from irb_source. Explanation
Boot partitions from installations prior to the 16.04 era are terribly small. When you install updates and encounter errors due...