To get a Gravatar you need to hash an email address with the MD5 algorithm. MD5 is a part of the Ruby standard library. Rails loads it by default, but otherwise you will have to require it yourself. This is a simple implementation. Gravatar su...

This query and pattern will return urls in text all within a single SQL query. select substring(column_name from '.*://([^/]*)') as domain_name from table_name; And here it is in a larger query, say for retrieving page view counts for referrers. ...

You can use string interpolation in combination with a dictionary for simple formatting. print "My name is %(name)s and I have $%(change)0.2f in change in my pocket!" % { 'name': 'Sean', 'change': 00.23 } # My name is Sean and I have $0.23 in chang...

You might have to append the path of the Postgres.app bin directory to your path in order to install the Python driver for Posgres. export PATH=$PATH:/Applications/Postgres.app/Contents/MacOS/bin To find the location of the application try this ...

r = /https?:\/\/[\S]+/i you_string.gsub(r, '') Here's the rubular regex to play around with yourself http://rubular.com/r/SRKkYrW4IJ

If you get this error message ActiveRecord::ConnectionTimeoutError could not obtain a database connection within 5.000 seconds (waited 5.001 seconds) Try closing the connection after each request using "after" in Sintara. # app.rb after { A...

find path/ -name *.txt

To open files with a single click from the file browser inside of TextMate 2 run this command from the terminal defaults write com.macromates.TextMate.preview fileBrowserSingleClickToOpen -bool true And to turn it off defaults write com.macro...

It's a little convoluted. Seeing as it's a pretty common thing you use when programming computers one might think that there would be a quick and easy method for it. But from what I can tell there isn't. So here is a snippet that will give you a *nix Epoc...

Session based flash messages are fairly common in web apps. They work well when you have a temporary status to report back to the user, such as successfully saving a form. If you use Rails it comes with the Framework. If you are using Sinatra there ar...