You should test the callback methods and its correct invocation in two separate tests. Understand the ActiveRecord note before you move on with this note. Say this is your Spaceship...
...class with a transition launch and a release_docking_clamps callback: class Spaceship state_machine :state, :initial => :docked do event :launch do transition :docked => :en_route end before_transition :on...
...s Deferreds. Native promises are much faster than their jQuery equivalent. Native promises are supported on all browsers except IE <=11, Android <= 4.4 and iOS <= 7. If you need Promise...
...support for these old browsers you can use a Polyfill. A very fast and small (2 KB minified and gzipped) polyfill is Zousan. If you want to waste even fewer...
...them. The goal is that if you're building a website using flexbox and something isn't working as you'd expect, you can find the solution here.
...spec continues to evolve and vendors nail down their implementations, this repo will be updated with newly discovered issues and remove old issues as they're fixed or become obsolete...
...be installing rbenv and ruby-build from our own fork, not from the Ubuntu sources. Installing rbenv Install rbenv: git clone https://github.com/rbenv/rbenv.git ~/.rbenv For Bash: echo 'export PATH...
...echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.zshrc echo 'eval "$(rbenv init -)"' >> ~/.zshrc Now reinitialize your shell, e.g. by opening a new terminal. Running type rbenv should then say "rbenv is a...
Hint: There's another card with this helper for Cucumber features. Sometimes you feel like you need to stub some CONSTANT you have defined in an other class. Since actually...
...constants are called constants because they're constant, there's no way to easily stub a constant. Here are three solutions for you. Easiest solution Rethink! Do you really need...
Note: If you using a passenger lower than 5.0.10 you have to use sudo to run this command. If using it with capistrano you should use passenger >=4.0.41 and...
...s possible you get this "error" message: *** [err :: example.com] There are no Phusion Passenger-served applications running whose paths begin with '/var/www/example.com'. *** [err :: example.com] This is just because there were...
When adding a new field to your model's database table, don't set any defaults in the database. It makes people wonder why they get such values when reading...
Why? Because nobody looks at the database layout since such things are part of your application's logic -- and thus they belong into the corresponding model. How to
Say you want to vertically align a div box inside a div container. This is how you do it: HTML Some text... in two lines. CSS Set the line-height...
...The container MUST have a height >= its line-height, because the line-height actually spans the area inside which .box will align vertically. #container { line-height: 50px; } Because the container...
...a linear gradient to an element, IE9 removes all border-radius and inset box-shadows. This is because you probably are doing linear gradients with this weirdo Microsoft filter:
...progid:DXImageTransform.Microsoft.gradient(startColorstr='#0A284B', endColorstr='#135887'); filter hijacks the rendering of the entire element box, so you're out of luck. IE9 doesn't support CSS gradients. A forward-looking...
...queries, Internet Explorer 8 and below will fail to respect them. Though there are several options (like mediatizr and css3-mediaqueries), Respond.js was the only one that worked for me...
= javascript_include_tag 'media_queries_polyfill' Note: Using an IE conditional means other super-ancient browsers that do not support media queries (like Safari 2.x, or Firefox...
For applications coming with lots of stylesheets and scripts, asset compilation might take quite long. This can be annoying when deploying a release that does not actually change assets.
...your app uses Sprockets, you can simply skip asset compilation and re-use the previous release's assets. [1] That is especially easy via Capistrano. Capistrano will automatically symlink your...
The classical scenario: There's a parent div element and you want to center some arbitrary child element vertically inside of it. Here's how you do it (also try...
} .child {} When .child elements are inline elements, add display: block; to their style. When you need to specify the width of .child elements, center them with margin: auto...
...and allows a lot of image editing before rendering the favicons, in all needed sizes, formats and with the HTML needed to include them! In Rails applications with Haml:
...all the favicon files into /public store the HTML to app/views/layouts/_favicon.html add = render 'layouts/favicon' to in your application layout(s) ... and you're all set...
A few releases back, Chrome started using a Material Design UI on desktop. If you don't like it (on some window managers or GTK themes it's ugly), you...
...can disable it. Visit chrome://flags/ Search (Ctrl+F) for "Material Design" Switch to "Non-Material" Restart Chrome Chrome's default theme should now be pretty again...
...reduce the pain is to to use Underscore.js's functions like _.each, _.map or _.select, which unfortunately clutters your code with awkward calls to the _ helper. Fortunately when you use...
...has a very versatile for keyword that can do anything that each, collect or select can do. Enjoy! each for item in items ... collect / map ages = (person.age for person in...
...installation to a newer version. If you're installing RubyMine for the first time, see install RubyMine under Ubuntu. You might also consider installing RubyMine with snap, so it can...
...license key from Help → Register; you may need it to reactivate the new version Shut down RubyMine Extract the downloaded file into your ~/bin/. [1] cd ~/bin && tar xzvf ~/Downloads/RubyMine-X.Y.Z.tar.gz...
...code into a gem. You know a gem was cut with Jeweler if you see the word jeweler in a gem project's Rakefile. This note describes how to update...
...probably defining the gem version in the Rakefile instead of in VERSION. Change this. Say rake release. This will do many things for you: Generate GEMNAME.gemspec and commit it
...a project, you probably want to have live CSS reloading, so every time you safe your css, the browser updates automatically. It's pretty easy to set up and will...
...safe you a lot of time in the long run. It will also instantly reload changes to your html views. Simply follow the instructions below, taken from blog.55minutes.com.
...also want to check out BoxCryptor which does pretty much the same, and is supported across many more platforms. I just didn't want to use Dropbox...
...One to automatically sync confidential files between my machines. The encryption is done via encfs, which is a file-based encryption that simply puts encrypted versions of files from one...
...offers a free app to build custom icon webfonts. It offers downloads as webfont set (.eot, .ttf, .woff, .woff2) or as icon set of SVG and/or PNG and many more...
...file types, or even SVG sprites. From my experience, the frontend developer should create the font, and not the designer. There are many tweaks required during font development, and routing...
I've recently moved from using Parallels for browser testing to Sun's Open Source VirtualBox. Here's a walkthrough on how to get a browser testing suite for free...
Every now and then, Java is subject to security issues where code can break out of Java's sandbox and obtain more privileges than it should. In almost all cases...
...by attacks via the Java browser plug-in, for example by malicious ad banners. Since removing Java completely is not an option for us, make sure the Java plug-in...
Cucumber step argument transforms can be a powerful way to make your steps more flexible. Note however that if your transform only matches a substring (no ^ and $ markers at the...
...beginning and end), you are still expected to return a replacement for the whole string that was piped through the transform. If you don't do that, you will truncate...
In order to save the original value of a constant, set the new value and restore the old value after a scenario was completed, you can use the following helper...
...It takes care of saving the old constant value, setting the new one without throwing warnings and resets the value with an After hook. This module also enables you to...