In order to cover some edge cases you rarely care about, Range#include? will become very slow in Ruby 1.9...
After updating your RubyGems, you will probably not be able to run Capistrano any more, but receive an error similar...
Pressing the ? key will display a list of keyboard shortcuts. Available shortcuts are: |search |/| |help|?| |add story|a| |toggle backlog...
RubyGems 1.6.0 has undergone some changes which may cause Rails 2.x applications to break with an error like this...
"Wallaby" is the codename for an experimental technology that converts the artwork and animation contained in Adobe® Flash® Professional (FLA...
If you have content inside a page that is hidden by CSS, the following will work with Selenium, but not...
There are two ways to define a class method from a Modularity trait. Note that the usual caveats regarding class...
Sometimes you might want to know if an attribute is an associated object or a simple string, integer etc. You...
If you want to get a deep understanding of how closures, blocks, procs & lambdas in Ruby work, check out the...
MySQL's MIN and MAX functions are for aggregations only. This will not work and produce an error:
My T410 has a NVIDIA graphics card (NVS 3100M). My BIOS configuration looks like this: NVIDIA Optimus is disabled in...
If you use a form (or form fields) multiple times inside one view, Rails will generate the same id attributes...
Flash movies (.swf files) can talk with Javascript code embedded in the same HTML page. There are two ways to...
Although you can access many symbols using the AltGr key you may be missing some, like the en-dash (–) or...
A while ago we were working on an application that had an entire version specially created for mobiles, such as...
Note: For PostgreSQL you should use advisory locks. For MySQL we still recommend the solution in this card.
There is no good equivalent for the Unix sudo command in Windows. Below are a few workarounds that are all...
This note is a reminder that there is something called AppArmor that could cause weird errors ("File not found", "Can...
To open a terminal quickly navigate to System → Preferences → Keyboard Shortcuts. There, click the "Run a terminal" row (It should...
On 32bit systems, the maximum representable Time is 2038-01-19 03:14:07 in UTC or 2038-01-19...
What are Google’s plans for turning WebM into a genuinely open standard, one that is based on consensus like...
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...
See our new comprehensive guide for upgrading every Rails 2 version ever.