I didn't know this, but because of a linking problem using custom taxonomies in Wordpress, I was forced to find out. If you create a new taxonomy, it will not work immediately on the front facing end. Your users will be greeted by a 404, page not found in...

How to validate uniqueness in a :has_many :through relationship with Ruby on Rails. You'll need three models in this example List, Subscriber and ListSubscriber. A list has many subscribers and a subscriber has many lists. Simple enough. Running the follo...

If you want to take a look at the SQL being generated by active record while your using the console, you can either type this into the console when it loads ActiveRecord::Base.logger = Logger.new(STDOUT) Or you can add it to your environment so that it'...

In the example below, I'm going to zip up a directory that includes images in both PNG and PSD file formats. However, I want to exclude the PSDs because they are huge! zip -r my-compressed-dir-without-psd.zip directory-to-zip -x '*.psd'

I assumed that rand would take a range as an argument. Something like rand(10..20), generating a random number between 10 and 20. Seems like you'd do this fairly often when working with random numbers and therefore, included. However, it doesn't work. But...