Cria o formato amigávem de postagem: "Publicado há X tempos atrás"

gistfile1.rb

  # 
  # Cria a data de publicacao no formato 'há XX YY atrás
  # 
  def created_at_tempos_atras
    agora = Time.now
    dif = (agora - self.created_at).to_i 
    
    if dif < 60
      dif = "#{dif} segundos"
    elsif dif > 59 && dif < 120 
      dif = "1 minuto"
    elsif dif > 119 && dif < 3600
      dif =  "#{dif/60} minutos"
    elsif dif > 3599 && dif < 7200
      dif = "1 hora"
    elsif dif > 7199 && dif < 86400
      dif =  "#{dif/60/60} horas"
    elsif dif > 86399 && dif < 172800
      dif = "1 dia"
    elsif dif > 172799 && dif < 5184000
      dif =  "#{dif/60/60/24} dias"
    elsif dif > 5183999 && dif < 10368000
      dif = "1 mês"
    elsif dif > 10367999 && dif < 62208000
      dif =  "#{dif/60/60/24/30/12} meses"
    elsif dif > 62207999 && dif < 124416000
      dif = "1 ano"
    elsif dif > 124415999
      dif =  "#{dif/60/60/24/30/12/12} anos"
    end
    
    "#{dif} atrás"
  end