Make it a little generic, time to step away for now

app/models/course.rb

@@ -6,6 +6,10 @@ class Course < ApplicationRecord
   # we them independently to avoid re-importing lectures.
   has_many :recordings, dependent: :destroy
 
+  def lectures_and_work_items
+    (lectures + work_items).sort_by(&:start_time)
+  end
+
   def import_from_calendar!
     ics_file = HTTParty.get("https://mytimetable.bath.ac.uk/ical?6519757b&group=false&timetable=!MjAyMyFzdHVkZW50c2V0ITRDRjQ5MjlGRTg1M0Q4N0MyMDZENTVDNUQ3QTJFNzk0&eu=amMzMDkxQGJhdGguYWMudWs=&h=MiuDbRiudE_Yf7B25v2SfEuFCtmYGkFb5sAUI3yGmtY=")
     calendars = Icalendar::Calendar.parse(ics_file)

app/models/work_item.rb

@@ -1,4 +1,8 @@
 class WorkItem < ApplicationRecord
   belongs_to :course
   has_many :tracked_time_entries, dependent: :destroy, as: :subject
+
+  def week_number
+    ((start_time.beginning_of_week - course.semester_start_date.to_time) / 1.week).floor + 1
+  end
 end