POW: Custom controller doubts

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How do you want to verify and use the referral code during registration? You can set up a changeset as described in the Creating custom controller callbacks with Pow - #2 by danschultzer thread. It describes how to check for an association only when the user is created.

Yeah, but you only need to override that single route:

  scope "/", MyAppWeb do
    resources "/registration", RegistrationController, singleton: true, only: [:create]
  end

  scope "/" do
    pow_routes()
  end

No.

See above.

Alternatively you can set up a custom context:

defmodule MyApp.Users do
  use Pow.Ecto.Context,
    repo: MyApp.Repo,
    user: MyApp.Users.User

  def create(params) do
    case verify_referral_code(params) do
      {:ok, _any}         -> pow_create(params)
      {:error, changeset} -> {:error, changeset}
    end
  end

  # ...
end

If the referral code is also used in the PowAssent callback phase then you would need to do this for the user identities context too.

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