class PresentationsController < AssetsController

  def show
    @presentation = @content
    render :layout => "slide"
  end
  def index
    @presentation = @content
    render :layout => "slide"
  end
  def content_model
    return Presentation
  end
end

class PresentationsController < AssetsController

  def show
    @presentation = @content
    render :layout => "slide"
  end
  def content_model
    return Presentation
  end
end

Remove the index action from the presentations controller
Remove the index action from the presentations controller
