elixir embedding step 7

address.ex

defmodule App.Models.Address do
  defstruct [:address, :address2, :city, :region, :postal, :country]

  defmodule Type do
    @behaviour Ecto.Type
    alias App.Models.Address

    def type, do: :json

    def cast(addrs) when is_list(addrs) do
      {:ok, Enum.map(addrs, &do_cast/1)}
    end
    def cast(_other), do: :error
    
    defp do_cast(%Address{} = addr), do: addr
    defp do_cast(%{} = addr), do: struct(Address, addr)

    def load(value), do: Poison.decode(value, as: [App.Models.Address])
    
    def dump(value), do: Poison.encode(value)
  end
end