I keep meaning to write up some of the useful gems (if you'll pardon the pun) which are hidden in the super-handy Facets gem. Today I'll cover Enumerable#mash. Let's say you have a list of Users, and you'd like to create a hash which lets you look up the Users based on their login. You might write something like: def create_login_hash_for( users ) user_login_hash = {} users.each do |user| user_login_hash[user.login] = user end user_login_hash end With Enumerable#mash, you can trim that down to:
