user_session_controller.ex

defmodule ProjectWeb.UserSessionController do
  use ProjectWeb, :controller

  alias Project.Accounts
  alias ProjectWeb.UserAuth

  def create(
        conn,
        %{
          "user" => %{"email" => email, "code" => code} = user_params
        }
      ) do
    if user = Accounts.verify_code_and_email(email, code) do
      conn
      |> put_session(
        :user_return_to,
        "/home"
      )
      |> UserAuth.log_in_user(user, user_params)
    else
      conn
      |> put_flash(:error, "Invalid credentials")
      |> redirect(to: "/login")
    end
  end
end