mix recompile cannot load some dependencies when in umbrella project

Questions / Help
,
1

Good evening, I created an umbrella project, and write the :amqp dependency on the top mix.exs file. Then some problems occur when I use mix clean and mix compile, here is the detais:

  • Elixir version: Elixir 1.15.7 (compiled with Erlang/OTP 26)

  • Erlang version: Erlang/OTP 26 [erts-14.1.1]

  • OS: Arch Linux x86_64

  • Current Behaviour:

mix new foo --umbrella
cd foo/apps
mix new bar

Then write amqp dependency on the root mix.exs file, and run mix deps.get:

foo/mix.exs

defp deps do
  [
    {:amqp, "~> 3.3"}
  ]
end

Then define an module use AMQP in bar:

foo/apps/bar/lib/bar2.ex

defmodule Bar2 do
  use AMQP
end

The first time run mix compile it succeeded, but when I run mix clean and mix compile after, it will report error:

==> bar
Compiling 2 files (.ex)
error: module AMQP is not loaded and could not be found
lib/bar2.ex:2: Bar2 (module)

== Compilation error in file lib/bar2.ex ==
** (CompileError) lib/bar2.ex: cannot compile module Bar2 (errors have been logged)
(elixir 1.15.7) expanding macro: Kernel.use/1
lib/bar2.ex:2: Bar2 (module)

If I put the amqp dependency on the bar’s mix.exs file there is no such errors. Is this way of writing depencencies on the top mix.exs wrong?

2

Check that your mix.exs in the bar app has the correct paths. The guide shows what it should look like:

def project do
    [
      app: :kv_server,
      version: "0.1.0",
      build_path: "../../_build",
      config_path: "../../config/config.exs",
      deps_path: "../../deps",
      lockfile: "../../mix.lock",
      elixir: "~> 1.14",
      start_permanent: Mix.env() == :prod,
      deps: deps()
    ]
  end
3

Thanks for answer. The bar app’s mix.exs file was generated by the mix command, this is the path config:

  def project do
    [
      app: :bar,
      version: "0.1.0",
      build_path: "../../_build",
      config_path: "../../config/config.exs",
      deps_path: "../../deps",
      lockfile: "../../mix.lock",
      elixir: "~> 1.15",
      start_permanent: Mix.env() == :prod,
      deps: deps()
    ]
  end

There shouldn’t be a problem with this file, right?