Method of the Day: Array()

Another oldy but a goodie... Array() wraps its parameter in an array. If it's already an array, it just returns it. If it's nil, it returns an empty array. It's super useful when you want to write a method that can take a single instance of an object or an array of objects.

Array(nil) => []
Array([]) => []
Array(1) => [1]
Array([1]) => [1]

def do_stuff(model_or_models)
  models = Array(model_or_models)
  models.each do |model|
    # do stuff...
  end
end