Using state_machine events within a resource_controller

When using state_machine you sometimes need to know whether an object may execute a certain transition. Let's take an arbitrary object such as a blog article as an example that has those states:

...

Given you have a strict CSP that only allows <script src> elements from your own domain:

Content-Security-Policy: script-src 'self'

This will block JavaScript handlers inlined as attribute into your HTML elements. Clicking on the f...

By convention, common protocols use a defined port, like 80 for HTTP or 443 for HTTPS.

You can use nmap to find out what service is running behind a given port, and most often see some details about it. This can be helpful if servers don't offe...

We had a card that described how to install multiple mysql versions using mysql-sandbox. Nowadays with the wide adoption of docker it might be easier to u...

CSS transitions are a simple animation framework that is built right into browsers. No need for Javascript here. They're supported by all browsers.

Basic usage

Transitions are used to animate the pat...

Assuming the following sunspot setup of the post class:

class Post < ActiveRecord::Base
  searchable do
    text :title
    string :state
    integer :category_ids
  end
end

In Sunspot you can scope your search via th...

Rails has always included a scaffold script that generates a default controller implementation for you. Unfortunately that generated controller is unnecessarily verbose.

When we take over Rails projects from other teams, we often find that cont...

When you register a delegated event using on (or the deprecated delegate / live), it is somewhat hard to manually trigger these events manually, e.g. for testing.

After trying jQuery's [`...

If you try to listen to events on elements that are nested inside a <fieldset disabled>, Firefox will stop event propagation once the event reaches the fieldset. Chrome and IE/Edge will propagate events.

Since we often bind event listeners to `...

When you cannot make Selenium trigger events you rely on (e.g. a "change" event when filling in a form field), trigger it yourself using this step:

When /^I manually trigger a (".*?") event on (".*?")$/ do |event, selector|
  page.execute_s...