I have a Workout model that has and belongs to many Equipment models. I have an array of some Equipment IDs. I want to find all Workouts that don't have any Equipment assigned that matches any of the array of Equipment IDs.

So, if my array = [2,3,5] I want to find all workouts where the assigned equipment ids does not include 2, 3 or 5.

EDIT:

Workout.joins(:equipment).where("equipment.id not in(?)",[2,3,5]).uniq

Assuming five instances of Equipment, the code above returns workouts with equipment.ids 1 and 4 (good), but also returns partial matches for example Workouts with equipment.id = [1,2], [1,2,3].