Complete Lesson 25

app/helpers/reviews_helper.rb

@@ -1,2 +1,9 @@
 module ReviewsHelper
+  def average_stars(movie)
+    if movie.average_stars.zero?
+      content_tag(:strong, "No reviews")
+    else
+      pluralize(number_with_precision(movie.average_stars, precision: 1) , "star")
+    end
+  end
 end

app/models/movie.rb

@@ -17,4 +17,7 @@ class Movie < ApplicationRecord
   def self.released
     where("released_on < ?", Time.now).order(released_on: :desc)
   end
+  def average_stars
+    reviews.average(:stars) || 0.0
+  end
 end

app/views/movies/index.html.erb

@@ -12,6 +12,9 @@
         <h3>
           <%= total_gross(movie) %>
         </h3>
+        <span class="stars">
+          <%= average_stars(movie) %>
+        </span>
         <p>
           <%= truncate(movie.description, length: 150, separator: ' ') %>
         </p>

app/views/movies/show.html.erb

@@ -8,6 +8,7 @@
       <%= year_of(@movie) %> &bull; <%= @movie.rating %>
     </h2>
     <div class="reviews">
+      <%= average_stars(@movie) %>
       <%= link_to pluralize(@movie.reviews.size, "review"), movie_reviews_path(@movie) %>
     </div>
     <p>