Added average to course

Author: dalvarez2596

app/models/course.rb

@@ -50,4 +50,12 @@ def self.levels
   def bought(user)
     self.enrollments.where(user_id: [ user.id ], course_id: [ self.id ]).empty?
   end
+
+  def update_rating
+    if enrollments.any? && enrollments.where.not(rating: nil).any?
+      update_column :average_rating, (enrollments.average(:rating).round(2).to_f)
+    else
+      update_column :average_rating, (0)
+    end
+  end
 end

app/models/enrollment.rb

@@ -30,6 +30,14 @@ def to_s
     user.to_s + " " + course.to_s
   end
 
+  after_save do
+    course.update_rating unless rating.nil? || rating.zero?
+  end
+
+  after_destroy do
+    course.update_rating
+  end
+
   protected
   def cant_subscribe_to_own_course
     if self.new_record?

app/views/courses/_course.html.haml

@@ -9,6 +9,9 @@
       = enrollment_button(course)
       .row
       = review_button(course)
+  .card-footer
+    .text-warning.fa.fa-star
+    = course.average_rating
   .card-footer
     .fa.fa-list-check
       = course.lessons.count

db/migrate/20241111030829_add_average_rating_to_courses.rb

@@ -0,0 +1,5 @@
+class AddAverageRatingToCourses < ActiveRecord::Migration[7.2]
+  def change
+    add_column :courses, :average_rating, :float, default: 0.0, null: false
+  end
+end