Add TranslationUnitsMap as content type for Translations

lib/outlook/translations/translation_units_map.ex

@@ -0,0 +1,33 @@
+defmodule Outlook.Translations.TranslationUnitsMap do
+  use Ecto.Type
+
+  alias Outlook.InternalTree.TranslationUnit
+
+  def type, do: :map
+
+  def cast(tumap) when is_map(tumap) do
+    {:ok, tumap}
+  end
+
+  def cast(_), do: :error
+
+  def load(serialized_map) when is_map(serialized_map) do
+    tumap = for {key, val_str} <- serialized_map do
+      val_map = Jason.decode!(val_str, keys: :atoms!)
+      val_tu = struct(TranslationUnit, %{val_map | status: String.to_atom(val_map.status)})
+      {key, val_tu}
+    end
+    |> Enum.into(%{})
+    {:ok, tumap}
+  end
+
+  def dump(tumap) when is_map(tumap) do
+    serialized_map = for {key, val} <- tumap do
+      {key, Jason.encode!(val)}
+    end
+    |> Enum.into(%{})
+   {:ok, serialized_map}
+  end
+
+  def dump(_), do: :error
+end