rails-api/active_model_serializers — pull request #630 by sachse (2014-09-03 06:49:59+00:00)
Title: README: Change :embed_key to :key

I've never used the 0.8 version of AMS but I'm guessing `:embed_key` was changed to `:key` and the README wasn't updated to reflect this everywhere? When I tried using the former it didn't work. Using `:key` worked fine.