blog.coffee

# Implementing the `comments` property in CoffeeScript.
# Note the lack of `flatten` and the heavy guarding
# against objects being undefined.

App.Blog = Ember.Object.extend
  comments: (->
    # Return all comments of all posts by flattening.
    (@get('[email protected]') ? []).reduce (a, b) ->
      # b is a lazy hasMany collection of comments, so we must cast to array.
      (a ? []).concat((b ? []).toArray())
    , []
  ).property('[email protected]')