title: How to provide defaults value for partial parameters in Rails?
body: <p>I need to render a shared partial which can receive a few parameters from several views, but I don't want to pass all parameters everytime. If I call the template without all parameters, I get an error.</p>
  
  <p>Is there a way to define default values for parameters, only if they haven't been defined when calling <code>render 'name_of_partial</code>?</p>