This week, I was sick so did not have a lot of time for work. 

However, I did play around with the new API for the Coiterate that we needed to get working. Specifically, I realized that if we pass in a tuple of PKs and IKs into Coiterate, then we need to adapt various other parts of the API, which assumed the PK was a single element. This may present some challenges that I will aim to finish as the last sprint of my GSoC.