Rails Tricks

Do you know what the command below would do?

post.select(&:activated?).collect(&:title)

Do you want to get maximums, minimums, averages, or sums for data in your tables? Did you know ActiveRecord has a .to_xml() method?
These and many other tips are on an interesting post at Ruby Inside called "19 Rails Tricks Most Rails Coders Don’t Know". It is quite old, but if you are coming to Ruby and Rails from other languages those tips could be quite handy.
Have Fun!