elixir - Cross DB Ecto config failing

Question

In config/dev.exs:

config :drupex, Drupex.Repo,
  adapter: Ecto.Adapters.Postgres,
  -- username, password, database, hostname, pool_size omitted --

config :drupex, Drupex.DrupalRepo,
  adapter: Ecto.Adapters.Mysql,
  -- username, password, database, hostname omitted --

In mix.exs under defp deps do I added {:mariaex, "~> 0.8.2"}, just after {:postgrex, ">= 0.0.0"}. Finally in lib/drupex/repo.ex I added

defmodule Drupex.DrupalRepo do
  use Ecto.Repo, otp_app: :drupex
end

I ran mix deps.get , mix deps.compile now running mix I get

** (ArgumentError) adapter Ecto.Adapters.Mysql was not compiled, ensure it is correct and it is included as a project dependency

Answer 1

Turns out the adapter is called MySQL and it is case sensitive. Changing to adapter: Ecto.Adapters.MySQL, solved the problem.