Incorrect number of subscribers

[fosterfarrell9]

Apparently, the count of people who have subscribed a lecture is occasionally displayed incorrectly in the lecture view for editors. The reason is that the view in which this happens (app/views/lecture/edit/_form.html.erb) is cached. If a user subscribes a lecture, the lecture database entry itself is not touched and hence, the cache is not invalidated. Only when some change in the lecture entry is made will this be the case.