ActiveRecord models know how to cast a given string to the type of a given attribute (or column).
Reading a URL via GET: curl http://example.com/ Defining any HTTP method (like POST or PUT): curl http://example.com/users/1...
Since version 1.5 RubyGems requires at least Ruby 1.8.7. The last one working with Ruby 1.8.6 was RubyGems 1.4.2.
It is common in Rails 3.0 applications that you want to provide default views for a group of controllers. Let...
When installing RMagick you may get an error messages like this: Version 2.13.1: checking for Ruby version >= 1.8.5... yes
If you want to manually check if e-mail delivery works on a machine by sending an e-mail you...
mitmproxy is an SSL-capable, intercepting HTTP proxy. It provides a console interface that allows traffic flows to be inspected...
blueprint is DevStructure’s workhorse tool that looks inside popular package managers, finds changes you made to configuration files, and...
Specify these gem versions in your Gemfile: gem 'cucumber', '~> 1.3.0' gem 'cucumber-rails', '= 0.3.2' # max version for Rails 2
The shell variable PS1 holds your bash prompt. You might want to change it to serve your needs best. Here...
Install OpenSSH Server: sudo apt-get install openssh-server To check if the server is running you should get no...
You will occasionally need to clean out your database while keeping the schema intact, e.g. when someone inserted data in...
My T410 has a NVIDIA graphics card (NVS 3100M). My BIOS configuration looks like this: NVIDIA Optimus is disabled in...
Although you can access many symbols using the AltGr key you may be missing some, like the en-dash (–) or...
This note is a reminder that there is something called AppArmor that could cause weird errors ("File not found", "Can...
Using OpenSSL it's very easy to seriously encrypt files. Use the script below. Input / Output are self explanatory. Put...
When you delete a file with rm it's still possible to recover the file or parts of it. Use...
This tool is used on our application servers (and called when deploying) but it also works locally. Just call dumple...
Sometimes you want to run a command forever, e.g. to compile a haml to html file on the console. Use...
When you need to bulk rename files you can not call "mv *.foo *.bar" to change the extension of all...
To list the name and version of your Linux distribution, type the following: cat /etc/*-release
When you use the send_file method to send a local file to the browser, you can save resources on...
You know Firebug as a Firefox extension but there is also a "Lite" version which runs purely off JavaScript.
The idea is this: you take a job that you'd rather not do manually, and describe it to babushka...