mix clean is required to see types changes take effect

[bmidgley]

Environment

• Elixir version (elixir -v): Erlang/OTP 23 [erts-11.2] [source] [64-bit] [smp:12:12] [ds:12:12:10] [async-threads:1] [hipe]
• Absinthe version (mix deps | grep absinthe): absinthe 1.6.4 / absinthe_plug 1.5.8
• Client Framework and version (Relay, Apollo, etc): graphiql

Expected behavior

First, running mix compile
Next, changing something in a types file like
field(:id, :id)
to
field(:id, :alternate_id)

testing assertions on the new behavior and using the action from a browser in dev should read from the alternate_id.

Actual behavior

id continued to produce the :id db column until running mix clean. Then it works as expected. Restarting iex on its own is not enough to break the stale cache.

[kyleboe]

I believe this is related to #1139. I have to do the same thing.