UsersHelper.rb

module UsersHelper

  #Returns the Gravatar for the given user.
  def gravatar_for(user, options = { size: 50 })
    gravatar_id = Digest::MD5::hexdigest(user.email.downcase)
    size = options[:size]
    gravatar_url = "https://secure.gravatar.com/avatar/#{gravatar_id}?s=#{size}"
    image_tag(gravatar_url, alt: user.email, class: "img-responsive")
  end

  def show_rating_in_stars(rating)
    rounded = (rating * 2).round / 2.0
    rounded = rounded.prettify
    floored = rounded.floor
    
    stars = show_n_stars(floored)
    stars += image_tag("star-half.png") if rounded > floored
    
    stars.html_safe
  end

  def show_n_stars(n)
    images = image_tag("star-on.png") * n
    return images
  end

end