demo.ex

defmodule DemoApp.User do
  def get_user() do
    with {:ok, user} <- Repo.query(%User{}),
         {:ok, ^user} <- is_user_email_verified(user),
         {:ok, ^user} <- is_user_subscribed(user) do
      {:ok, user}
    else
      {:error, reason} -> {:err, reason}
      _ -> {:error, "Something went wrong"}
    end
  end

  defp is_user_email_verified(%User{} = user) do
    case true do
      true -> {:ok, user}
      false -> {:error, "User email is not verified"}
      _ -> {:error, "Something went wrong"}
    end
  end

  defp is_user_subscribed(%User{} = user) do
    case true do
      true -> {:ok, user}
      false -> {:err, "User is not subscribed"}
      _ -> {:error, "Something went wrong"}
    end
  end
end