Quick and dirty way to get a struct to a map.

deepmap.ex

defmodule DeepMap do
  def deep_to_map(%DateTime{} = struct), do: DateTime.to_iso8601(struct)
  def deep_to_map(%Date{} = struct), do: Date.to_iso8601(struct)
  def deep_to_map(%NaiveDateTime{} = struct), do: NaiveDateTime.to_iso8601(struct)

  def deep_to_map(%_{} = struct) do
    struct
    |> Map.from_struct()
    |> deep_to_map()
  end

  def deep_to_map(map) when is_map(map) do
    for {key, val} <- map, into: %{}, do: {key, deep_to_map(val)}
  end
  
  def deep_to_map(list) when is_list(list) do
    Enum.map(list, &(deep_to_map(&1)))
  end
 
  def deep_to_map(not_a_map_or_a_struct) when is_binary(not_a_map_or_a_struct),
    do: not_a_map_or_a_struct

  def deep_to_map(not_a_map_or_a_struct) do
    not_a_map_or_a_struct
  end
end