Compiling Umbrella Fails; Individual Apps Compile Fine

Questions / Help
,
1

I hit a bit of an unexpected snag while working on an umbrella app. Each of my apps compiles individually just fine, but when I try to run mix deps.compile from the root of the umbrella, I get an error with one of my apps (named “countries”):

== Compilation error in file lib/resource.ex ==
** (CompileError) lib/resource.ex:2: module Ecto.Query is not loaded and could not be found

The file in question has this at its top:

defmodule Countries.Resource do
    import Ecto.Query, warn: false

I do have {:ecto, "~> 3.0"} in the country app’s mix file. And if I go into the app, I can compile it fine:

cd apps/countries
mix deps.compile

Can anyone shed some light on why this is problematic?

Thanks!

2

:wave:

Can you compile the country app with

cd apps/countries
mix compile

?

If some other app in your project depends on the country app then running mix deps.compile from the umbrella root would call “compile” in it.

3

Yes, He can. He said in his very last paragraph.

4

:wave:

Unlike mix compile, mix deps.compile does not compile the app – only its dependencies.

2 Likes
5

Yes, both mix compile and mix deps.compile work in my “countries” app.

6

Oh, wow, I haven’t seen the deps on that line.

7

I have no explanation for this, but now when I run the command, it works. Maybe something was stuck in cache and the “countries” app finally started seeing the ecto dependency.

8

I was having this exact issue yesterday with a new phoenix umbrella project. I tried everything but in the end deleting the _build directory was what fixed it for me.