module ActionView::Rendering

def _normalize_args(action = nil, options = {})

render "foo/bar" to render template: "foo/bar".
Normalize args by converting render "foo" to render action: "foo" and 
def _normalize_args(action = nil, options = {})
  options = super(action, options)
  case action
  when NilClass
  when Hash
    options = action
  when String, Symbol
    action = action.to_s
    key = action.include?(?/) ? :template : :action
    options[key] = action
  else
    if action.respond_to?(:permitted?) && action.permitted?
      options = action
    elsif action.respond_to?(:render_in)
      options[:renderable] = action
    else
      options[:partial] = action
    end
  end
  options
end