"undefined function use/3" on `use Ash.Resource, data_layer: AshPostgres.DataLayer`

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1

Please help :frowning: … I know this must be a stupid mistake, but the error I’m getting has nothing to do with the root problem. Probably. Maybe.

error: undefined function use/3 (there is no such import)
  lib/boss_site/walk/resources/activity.ex:11: BossSite.Walk.Activity (module)
== Compilation error in file lib/boss_site/walk/resources/activity.ex ==
** (CompileError) lib/boss_site/walk/resources/activity.ex: cannot compile module BossSite.Walk.Activity (errors have been logged)

The code it’s pointing at:

defmodule BossSite.Walk.Activity do
  use Ash.Resource,  # << – error points here
    data_layer: AshPostgres.DataLayer

  do postgres
    table "activities"
    repo BossSite.Repo
  end
  ...

I’m thinking it must be something like an incompatible version dependency or…?

# mix.exs // deps
  defp deps do
    [
      {:phoenix, "~> 1.7"},
      {:phoenix_ecto, "~> 4.4"},
      {:ecto_sql, "~> 3.11"},
      {:postgrex, ">= 0.0.0"},
      {:phoenix_html, "~> 3.3"},
      {:phoenix_live_reload, "~> 1.4", only: :dev},
      {:phoenix_live_view, "~> 0.2"},
      {:floki, ">= 0.35.0", only: :test},
      {:phoenix_live_dashboard, "~> 0.8"},
      {:esbuild, "~> 0.5", runtime: Mix.env() == :dev},
      {:tailwind, "~> 0.2", runtime: Mix.env() == :dev},
      {:swoosh, "~> 1.14"},
      {:finch, "~> 0.16"},
      {:telemetry_metrics, "~> 0.6"},
      {:telemetry_poller, "~> 1.0"},
      {:gettext, "~> 0.24"},
      {:jason, "~> 1.4"},
      {:plug_cowboy, "~> 2.6"},

      # My stuff - some supporting dependencies I really like:

      {:mix_test_interactive, "~> 1.2", only: :dev, runtime: false}, # mix test.interactive package
      {:dialyxir, "~> 1.3", only: [:dev], runtime: false}, # catch the naughty stuff
      {:lettuce, "~> 0.3", only: :dev}, # background iex recompile package (see config: for proper setup!)
      {:credo, "~> 1.7", only: [:dev, :test], runtime: false}, # catch more naughty stuff
      {:propcheck, "~> 1.4", only: [:test, :dev]}, # property based testing and generator magiks

      # My stuff - dependencies and frameworks this project uses:application

      {:ash, "~> 2.17"},
      {:ash_postgres, "~> 1.3"},
      {:ash_phoenix, "~> 1.2"},
    ]
  end

Relevant config.exs:

import Config

config :boss_site,
  ecto_repos: [BossSite.Repo]

config :boss_site,
  :ash_apis, [BossSite.Walk]

This is an early iteration, with 3 resources. It was working fine using ETS. Now I’m trying to upgrade it to “real” persistence with Postgres. I’ve been through the Ash Postgres tutorials a dozen times looking for something out of place, and just can’t find it.

2 
defmodule BossSite.Walk.Activity do
  use Ash.Resource,  # << – error points here
    data_layer: AshPostgres.DataLayer

  do postgres # <- its treating this as a `do` block for `use Ash.Resource`, which looks like a third argument.
  postgres do # <- do goes after postgres, not before it

    table "activities"
    repo BossSite.Repo
  end
3

Thanks @zachdaniel. I feel like I pasted that from somewhere – but, who knows at this point. :blush: Probably just my brain getting muddled.