### Summary The endpoint for obtaining course editions which are active during a given period of time does not return the expected list of courses. ### Steps to Reproduce <!-- The steps that anyone can follow to get the bug --> 1. Use EditionControllerAPI#getAllEditionsActiveDuringPeriod to request a list of course editions active during a given period of time. 2. Receive an incomplete list of course editions. ### Possible Fix The logic for determining which courses are active contains two contradictions: Relevant code from `EditionRepository`: ```java default List<Edition> findAllActiveDuring(Period period) { return findAll((q.startDate.before(period.getStart()).and(q.endDate.after(period.getStart()))) .or(q.startDate.after(period.getStart()).and(q.startDate.before(period.getStart()))) .or(q.startDate.after(period.getEnd()).and(q.startDate.before(period.getEnd())))); } ``` This could be fixed and simplified as follows: ```java default List<Edition> findAllActiveDuring(Period period) { return findAll((q.startDate.after(period.getStart()).and(q.startDate.before(period.getEnd()))) .or(q.endDate.after(period.getStart()).and(q.endDate.before(period.getEnd())))); } ```