Running a elixir dependency's migrations from parent app (in parent repo)

A_README.md

Goal

To pull in dependencies and have them run their migrations in the parent apps' repo.

Setup

MyChild - A mix application with ecto migrations, schemas, etc. MyParent - A phoenix application that wants to leverage the child application.

In this case MyParent has added MyChild as a mix dependency via github, eg:

{:my_child, github: "AgilionApps/my_child"}

lib.mix.tasks.migrate.ex

# In Parent app
defmodule Mix.Tasks.Migrate do
  use Mix.Task

  @shortdoc "Run migrations for this project and dependencies"
  def run(_) do
    migrate_child_app
    Mix.Task.run("ecto.migrate")
  end

  def migrate_child_app do
    {:ok, _} = Application.ensure_all_started(:my_parent)

    path = Application.app_dir(:my_child, "priv/repo/migrations")
    Ecto.Migrator.run(MyParent.Repo, path, :up, all: true)

    :init.stop()
  end
end