I have two pods. One for Trainers and one for Classes. There are several trainers in the trainers pod and several classes in the Classes pod.
I have created a "multi-select pick" column for Trainers that is related to classes. So when adding a new trainer you can select which classes they teach.
What I need to do is filter and display all trainers that teach say for example "puppy classes".
When someone selects a class, they are taken to a single class page. The single class page sidebar uses conditional tags to determine which class is being viewed.
So if for instance, if Puppy Classes is being viewed I would like all the trainers that teach Puppy Classes listed in the sidebar. As mentioned before I use multi-select PICK relationship to relate classes to trainers.