gistfile1.rb

I don't do:
<%= javascript_tag do %>
  window.posts = <%= @posts.to_json %>
<% end %>

I do:
<div id="posts" data-url="<%= @posts %>">
And the view is smart enough to know to call to_json on it, works for collections

Also:
def as_json
  {} # returns a hash of filtered attributes of model
end