Method lookup Understand all the terms in How Ruby method lookup works, in particular: include extend singleton class
Bash stores the exitcodestatus of piped commands in the environment variable PIPESTATUS So you can just echo ${PIPESTATUS[@]} to get...
PhantomJS has no binary builds for Linux, and building it yourself is painful. However, you can install it through npm...
I recommend install Node.js using nvm. This way you can have multiple Node versions in your ~/.nvm. You also won...
We've already learned how to integrate user-provided images uploads to our application in 205 basic file uploads and...
Talk with a colleague and find out why we're using building some of our sites using static site...
We are using the BEM pattern ("Block, Element, Modifier") to structure our CSS in all new projects. We try to...
Built-in matchers Get an overview of all the matchers that are built into RSpec. Play with some of...
To update your Rubygems to the latest available version, type the following: gem update --system Note that you have a...
Unfortunately, Web APIs haven’t provided the functionality to copy text to the clipboard through JavaScript, which is why visiting...
Spreewald comes with a selector_for helper that matches an English term like the user's profile into a CSS...
If you need a postgresql extension for your database it isn't a good idea to give your applications database...
Read the Rails Guide about Active Record migrations Understand why we never use models in migrations. Checkout the repository...
Learn to store attachments in a way that is accessible by authorized users only Learn to prevent users from...
Understand how asynchronous JavaScript works: Read Henning's presentation about asynchronous Javascript (there's also a German video presentation...
In a web application you often need to move data between the client (HTML, Javascript) and the server (Ruby, Rails...
Each time thin boots, it prints a boot message : Thin web server (v1.6.3 codename Protein Powder) Maximum connections set to...
tig is a command line explorer for Git that is just awesome. Install via apt-get or brew. Handy commands...
Here is how to start your Rails application to accept both HTTP and HTTPS in development. gem install passenger
Web security basics Einführung in die Web Security 🇩🇪 provides essentials for the topic of this card. Read following chapters:
CTRL + SHIFT + ALT + N Search for any symbol in your application, like CSS classes, Ruby classes, methods, helpers etc...
A common task in web applications is to add client-side JavaScript behavior to existing HTML elements.
To change RAM size, VDISK size or VCPU count of an openstack instance you have to use nova resize. You...
If you see a stacktrace beginning with lines like this: E, [2015-07-16T09:23:10.896146 #23308] ERROR -- : app...