Add ability to start lecture and redirect to recorded content.

app/models/course.rb

@@ -61,6 +61,7 @@ class Course < ApplicationRecord
     end
   end
 
+  # What should this do for existing attendances?
   def renumber_lectures!
     lectures.group_by(&:kind).each do |kind, lectures|
       lectures.sort_by(&:start_time).each_with_index do |lecture, index|

app/models/lecture.rb

@@ -5,7 +5,7 @@ class Lecture < ApplicationRecord
 
   enum :kind, [
     :lecture,
-    :problem_class,
+    :problems_class,
   ], default: :lecture
 
   def week_number