presença de suporte ativo

object.presence</code>is equivalent toobject.present? ? object : nil</code>

Usar
region = params[:state].presence || params[:country].presence || 'US'</code>

em vez de

state   = params[:state]   if params[:state].present?
country = params[:country] if params[:country].present?
region  = state || country || 'US'</code></pre>