tddphoenix_first_invite_user.ex

defmodule MyApp.Users.Invite do

  alias MyApp.User
  alias MyApp.Repo

  @create_params [:email]

  def call(%{email: email}) do
    email
    |> build_changeset
    |> create_user
  end

  defp build_changeset(email) do
    params = %{email: email}

    %User{}
    |> Ecto.Changeset.cast(params, @create_params)
    |> Ecto.Changeset.unique_constraint(:email)
  end

  defp create_user(changeset) do
    changeset
    |> Repo.insert
  end
end