I think I'm going to have to make a custom operator for this, but I figured I might as well ask in case I'm missing something obvious.
Let's say I have (in D7) three nodes tagged with colours:
The user selects red, blue, and green from the exposed filter in a view. This view should return Node 1, Node 3, and Node 4, but not Node 2 (as it is tagged with yellow). Using the "has taxonomy term" filter, the operators "is all of" and "is one of" don't work here, as the first one returns nothing, and the second returns Node 2.
To make things even more complex, I'll need to do this with two different filters in the view (with different sets of taxonomy terms), as well as have a standard "is one of" filter on a third taxonomy term set.
Am I missing a simple solution with this, or do I need to write a custom operator/filter? Thanks!