Phoenix: how to run Ecto in Mix custom task?

my_task.ex

defmodule Mix.Tasks.MyTask do
  use Mix.Task
  import Ecto.Query
  alias MyApp.Repo

  @start_apps [
    :postgrex,
    :ecto,
    :ecto_sql
  ]

  @repos Application.get_env(:my_app, :ecto_repos, [])

  def run(args) do
    start_services()

    # Run Ecto...

    stop_services()
  end

  defp start_services do
    Enum.each(@start_apps, &Application.ensure_all_started/1)
    Enum.each(@repos, & &1.start_link(pool_size: 2))
  end

  defp stop_services do
    :init.stop()
  end
end

Or just use this:

defmodule Mix.Tasks.MyTask do
  use Mix.Task
  import Ecto.Query
  alias MyApp.Repo

  def run(args) do
    Mix.Task.run("app.start")
    # Run Ecto...
  end
end

Helped a lot!

Thanks @hipertracker!