Store image hashes in the db - part 2

lib/music_library/records.ex

@@ -58,7 +58,7 @@ defmodule MusicLibrary.Records do
     q =
       from r in Record,
         where: r.id == ^id,
-        select: r.image_data
+        select: %{image_data: r.image_data, image_data_hash: r.image_data_hash}
 
     Repo.one!(q)
   end

lib/music_library_web/controllers/image_controller.ex

@@ -8,10 +8,7 @@ defmodule MusicLibraryWeb.ImageController do
       nil ->
         send_resp(conn, 404, "Not found")
 
-      image_data ->
+      %{image_data: image_data, image_data_hash: etag} ->
-        # TODO: move hash result to database
-        etag = :crypto.hash(:sha256, image_data) |> Base.encode16()
-
         case get_req_header(conn, "if-none-match") do
           [^etag] ->
             send_resp(conn, 304, "")