Person.ex changeset

person.ex

def changeset(person, attrs) do
  attrs = if attrs["birthday"] do
    bday = attrs["birthday"]
    {year, _} = Integer.parse(bday["year"])
    {month, _} = Integer.parse(bday["month"])
    {day, _} = Integer.parse(bday["day"])
    case Timex.parse("#{year}/#{month}/#{day}", "{YYYY}/{M}/{D}") do
      {:ok, date} ->
        age = Timex.diff(Timex.now, date, :years)
        Map.put(attrs, "age", age)
      {:error, msg} -> IO.puts msg
    end
  else
    attrs
  end
  person
    |> cast(attrs, [:name, :age, :birthday, :address])
    |> validate_required([:name, :age, :birthday, :address])
end