1module ApplicationHelper
2  def gravatar_for(user, options = { size: 40 })
3    gravatar_id = Digest::MD5::hexdigest(user.email.downcase)
4    image_tag("https://secure.gravatar.com/avatar/#{gravatar_id}?s=#{options[:size]}&d=mm", alt: user.name, class: 'gravatar')
5  end
6end