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Rails - json.erb template
<% @items.each do |item| %>
<%= { :item => { :id => item.id, :name => item.name }.to_json.html_safe  %>
<% end %>

<%= params[:callback]+"(" if params[:callback]  %>
<% @items.each do |item| %>
    <%= { :item => { :id => item.id, :name => item.name }.to_json.html_safe  %>
<% end %>
<%= ")" if params[:callback]  %>

items = Item.all
render :json => items.to_json(:only => [:id, :name]), :callback => params[:callback]

class Item

  def date
    return "1 year and 8 months" #obviously use logic here
  end

  def as_json(args={})
    super(:methods=>[:date], :only=>[:id=>:name])
  end
end