anchor.diff:      # We're already displaying all items
       return
     clear_items()
  -  for category_id of items_by_category
  -    append_items_by_category category_id
  +  append_items all_items
     activate btn
     return
   
  
positive.code: Append all items from the given category to the items picker.
  ###
  append_items_by_category = (category_id) ->
    items_by_category[category_id].forEach (item) ->
      $('#items').append create_button(item.name)
  
  ###
  
negative.code: # Include routes helpers
  <% environment.context_class.instance_eval { include Rails.application.routes.url_helpers } %>
  
  all_items = JSON.parse('<%= raw Item.order(:name).select(:name).to_json %>')
  
  items_by_category = JSON.parse(
    '<%= raw Category.order(:name).map { |category|
  