Ruby on Rails display half a star for a decimal rating, e.g. 4.5

Question

I am able to view 5 asterisks for a rating of 5 for a product, and 4 asterisks for a rating of 4 etc. But what I would like to do is replace the asterisks with an image of a

Answer 1

You can try with something like this:

module ApplicationHelper

  def render_stars(value)
    i_value = value.floor
    f_value = value - i_value

    output = '*' * i_value
    output << image_tag('half_star.jpg') if f_value > 0

    output
  end

end

You might have to use .html_safe in the view.

Your html.erb snippet looks wrong, however. It won't render correctly, and it will raise an error if you don't close the first if somewhere down the file. What do you want to achieve?

Answer 2

Let's assume you want to use star.gif as a star image and half-star.gif as the 1/2 star image:

module ApplicationHelper
  def render_stars(value)
    output = ''
    if (1..5).include?(value.floor)
      value.floor.times { output += image_tag('star.gif')}
    end
    if value == (value.floor + 0.5) && value.to_i != 5
      output += image_tag('half-star.gif')
    end
    output.html_safe
  end
end