Slick left/right/outer joins with Option

Question

In the Slick examples there are a few examples of joining where one of the resulting columns can be nulls, as it can be the case when doing left, right, or outer joins. For

Answer 1

In Slick 3.1.1, the correct answer would be simply (as mentioned in some comments):

for {
  (c, s) <- coffees joinLeft suppliers on (_.supID === _.id)
} yield (c, s)