makandra Operations

Sending a testmail from a server with a configured exim is easy as pie. From your usershell: tell exim that...

When you make a simple TCP connection to a remote server (like telnet), your client won't normally notice when...

You want to test your 1GE or 10GE internet uplink? We needed to ensure we have full 10GE to the...

When dealing with AR scopes, you can remove conditions, order, etc by using the unscope method. It is available on...

Our applications not only need to be functional, they need to be fast. But, to quote Donald Knuth, premature optimization...

What is a Cookie? Google it if you do not know. How are cookies transferred between your browser and...

The asset pipeline is one of Rails' two mechanisms how stylesheets, javascripts and images from your /assets folder are processed...

Some tasks in a web application are better not done live when a user request a page, but in the...

postgresonline.com

When working with PostgreSQL, you can use pgAdmin as a GUI. While you can do most things just like on...

ma.ttias.be

Article shows how to make a script that fakes one kind of content when printed with cat, but uses different...

As the web is being used for more and more tasks, expectations rise. Not only should web pages offer rich...

makandra dev
developer.chrome.com

In the DevTools settings, there's a "Shortcuts" section. Found these keyboard shortcuts there: General ESC Toggle drawer

This is how you regain disk space from OpenStack instances if you are using kvm and qcow. If your instance...

Method lookup Understand all the terms in How Ruby method lookup works, in particular: include extend singleton class

PhantomJS has no binary builds for Linux, and building it yourself is painful. However, you can install it through npm...

Many of our clients can't or don't want to design their user interfaces. In the absence of a...

makandra Curriculum

We've already learned how to integrate user-provided images uploads to our application in 205 basic file uploads and...

makandra Curriculum

Your MovieDB gained traction and is now a popular tool among cineasts. This comes with a downside: You noticed a...

Talk with a colleague and find out why we're using building some of our sites using static site...

If you need a postgresql extension for your database it isn't a good idea to give your applications database...

makandra Curriculum

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...