Migrate marks to ratings on feedbacks

lib/tasks/2018_08_27_migrate_feedbacks.rake

@@ -0,0 +1,19 @@
+require Rails.root.join("lib", "tasks", "task_helper")
+
+namespace :'2018_08_27_migrate_feedbacks' do
+  task run: :environment do
+    MAPPING = {
+      0 => Feedback.ratings.fetch(:unhappy),
+      1 => Feedback.ratings.fetch(:neutral),
+      2 => Feedback.ratings.fetch(:happy)
+    }
+
+    MAPPING.keys.each do |mark|
+      rating = MAPPING[mark]
+
+      Feedback
+        .where(mark: mark)
+        .update_all(rating: rating)
+    end
+  end
+end