Move subtype parsing to ReleaseGroup

lib/music_brainz/release_group.ex

@@ -25,6 +25,13 @@ defmodule MusicBrainz.ReleaseGroup do
     "https://musicbrainz.org/release-group/#{id}"
   end
 
+  def parse_subtype("Album"), do: :album
+  def parse_subtype("EP"), do: :ep
+  def parse_subtype("Live"), do: :live
+  def parse_subtype("Compilation"), do: :compilation
+  def parse_subtype("Single"), do: :single
+  def parse_subtype(_), do: :other
+
   defp get_release_groups(release_group) do
     release_group
     |> Map.get("relations", [])

lib/music_brainz/release_group_search_result.ex

@@ -2,10 +2,12 @@ defmodule MusicBrainz.ReleaseGroupSearchResult do
   @enforce_keys [:id, :type, :title, :artists, :release]
   defstruct [:id, :type, :title, :artists, :release]
 
+  alias MusicBrainz.ReleaseGroup
+
   def from_api_response(rg) do
     %__MODULE__{
       id: rg["id"],
-      type: parse_subtype(rg["primary-type"]),
+      type: ReleaseGroup.parse_subtype(rg["primary-type"]),
       title: rg["title"],
       artists:
         rg["artist-credit"]
@@ -14,11 +16,4 @@ defmodule MusicBrainz.ReleaseGroupSearchResult do
       release: rg["first-release-date"]
     }
   end
-
-  defp parse_subtype("Album"), do: :album
-  defp parse_subtype("EP"), do: :ep
-  defp parse_subtype("Live"), do: :live
-  defp parse_subtype("Compilation"), do: :compilation
-  defp parse_subtype("Single"), do: :single
-  defp parse_subtype(_), do: :other
 end