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
    if rounded.is_a? Integer
      num_stars = rounded
      show_n_stars(num_stars)
    else
      num_stars = rounded.to_i
      show_n_stars(num_stars)
      image_tag("star-half.png")
    end
  end

  def show_n_stars(n)
    images = ""
    
    n.times do
      images += image_tag("star-on.png")
    end
    
    images
  end
end