GAE Go — How to use GetMulti with non-existent entity keys?

Question

I\'ve found myself needing to do a GetMulti operation with an array of keys for which some entities exist, but some do not.

My current code, below, returns

Answer 1

I know this topic is up for more than a few days, but I like to post an alternative, using type switch.

if err := datastore.GetMulti(c, keys, dst); err != nil {
  switch errt := err.(type) {
  case appengine.MultiError:
    for ix, e := range errt {
      if e == datastore.ErrNoSuchEntity {
        // keys[ix] not found
      } else if e != nil {
        // keys[ix] have error "e"
      }
    }
  default:
    // datastore returned an error that is not a multi-error
  }
}