using_with_2_user.ex

defmodule User do

  defstruct [:name, :email]
  
  def create(params) do
    with {:ok, name} <- validate_name(params["Name"]),
         {:ok, email} <- validate_email(params["Email"])
    do
      {:ok, %__MODULE__{name: name, email: email}} # create user model with validated params
    else
      {:error, message} ->
        {:error, message} # pass the error back to the caller
    end
  end
  
  # basic validation, which should be added too
  defp validate_name(nil), do: {:error, "Tell me your name!"}
  defp validate_name(name), do: {:ok, name}
  
  # basic validation, which should be added too
  defp validate_email(nil), do: {:error, "Tell me you email address!"}
  defp validate_email(email), do: {:ok, email}

end