About-Payments: Platform to compare payment providers

Haml 6 was a major rewrite with performance in mind. To achieve a performance improvement of 1.7x, some design trade-offs had to be made. The most notable change might be the simplifie...

The exception_notification gem supports to provide custom data to e.g. the fail mail within foreground or background jobs.

ExceptionNotifier.notify_exception(_ex_, :data => {:message =>...

This post will describe how I stumbled upon a code path in the Linux kernel which allows external programs to be launched when a core dump is about to happen. I provide a link to a short and ugly Ruby script which captures a faulting process, runs...

The RSpec matcher tests if two HTML fragments are equivalent. Equivalency means:

• Whitespace is ignored
• Types of attribute quotes are irrelevant
• Attribute order is irrelevant
• Comments are ignored

You use it like this:

html = ...
...

When you need information about a gem (like version(s) or install path(s)), you can use the gem binary from the command line, or the Gem API inside a ruby process at runtime.

gem binary (in a terminal)

You can get some information abou...

Search engines, such as Google and Bing are engineered to crawl static web pages, not javascript-heavy, client-side apps. This is typical of a search engine which does not render javascript when the search bot is crawling over web pages.

This...

Lets say we have a user with a contract whereas contract is a mounted carrierwave file.

Now we want to send the link to the contract in a mail. For this use case join the root_url with...

Rails includes milliseconds in Time / DateTime objects when rendering them as JSON:

JSON.parse(User.last.to_json)['created_at']
#=> "2001-01-01T00:00:00.000+00:00"

In RSpec you might want to use .to_json instead of .iso8601 t...

When you need to use diff in either some Ruby code or your Rails app, use the differ gem.

puts Differ.diff "foo", "boo"
# => {"boo" >> "foo"}

Usage

There are several variants available, all us...

The Visual Viewport API enables developers to access the actually visible area of the page. This differs from the normal viewport if:

• the user has pinch-zoomed
• the on-screen ...