Using Scenic, you can bring the power of SQL views to your Rails application without having to switch your schema...
Note The maintenance mode is enabled on all application server as soon as the file /public/system/maintenance.html is present. Installation
You login to a Linux server with a performance issue: what do you check in the first minute? uptime
The nokogiri gem provides different packages for several platforms. Each platform-specific variant ships pre-built binaries of libxml2, e.g...
You can use proxy_hide_header in different contexts: Syntax: proxy_hide_header field; Default: — Context: http, server, location
The puppet server caches custom functions. If you edit an existing function (e.g. while you’re developing it), you’ll...
You can use mail-tester.com to check your application's e-mails for issues that might cause e-mails to be...
Note This card does not reflect the current state of lazy loading technologies. The native lazy attribute could be used...
Sometimes you just want to have a small web server that serves files to test something. Serve the current directory...
While you can use Apache as a reverse proxy, it tries to be too smart. Try nginx instead, it's...
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...
When working with PostgreSQL, you can use pgAdmin as a GUI. While you can do most things just like on...
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...
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