I’m trying to use Commanded with Phoenix to create an eventsourced application. I’ve pieced things together from the conduit repo and the commanded docs but I’m getting a failure and stacktrace when I try to run my tests against my aggregate.

There is quite a bit of configuration, support code, and application code so I’m not sure which of that would be helpful to post here. Once my tests start, I’m getting error message:

** (UndefinedFunctionError) function Ecto.Adapters.SQL.Sandbox.child_spec/1 is undefined or private
     stacktrace:
       Ecto.Adapters.SQL.Sandbox.child_spec({Postgrex.Protocol, [types: Postgrex.DefaultTypes, username: "postgres", password: "password", database: "accounts_test", hostname: "localhost", pool: Ecto.Adapters.SQL.Sandbox, pool_size: 2]})
       (db_connection) lib/db_connection.ex:389: DBConnection.start_link/2
       (accounts) test/support/storage.ex:24: Accounts.Storage.reset_readstore/0
       (accounts) test/support/storage.ex:7: Accounts.Storage.reset!/0
       (ex_unit) lib/ex_unit/on_exit_handler.ex:142: ExUnit.OnExitHandler.exec_callback/1
       (ex_unit) lib/ex_unit/on_exit_handler.ex:128: ExUnit.OnExitHandler.on_exit_runner_loop/0

I’ve looked at db_connection.ex:389 and it’s not calling child_spec/1 so I’m very confused why this is happening. I’ve been trying to debug this for about 4 hours now and I’m at a loss.

The last bit of my code from the stacktrace above:

  defp reset_readstore do
    config = Application.get_env(:accounts, Accounts.Repo)
    {:ok, conn} = Postgrex.start_link(config)

    Postgrex.query!(conn, truncate_readstore_tables(), [])
  end