blog.westarete.com

One thing that bothered me when I started using rails was that there wasn’t a built-in way to verify that your actions are getting the correct arguments. For example, in this typical action:

  def show
    @dog = Dog.find(params[:id])
  end

an exception is raised if the “id” parameter is omitted (e.g. /dog/show rather than /dog/show/5), and you get a rails application error by default. It seemed like there should be a way to declare that this action requires an “id” parameter of type integer, and provide a graceful way to recover if that constraint isn’t met.

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