Activity

A helper method that calls another action's helper method by name can get another helper's. Rails mixes every helper into every view, so calling index from ItemsHelper#create runs whichever helper's index Rails included last, such as PagesHelper#index:

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module ItemsHelper
  def index
    [:ul, @items.map { |i| [:li, i.name] }]
  end

  def create
    index # PagesHelper#index, not ItemsHelper#index
  end
end

Action names like index, show and edit are in many helpers, and the Readme encourages helper methods calling one another.