Rename image* to cover*

lib/music_library_web/controllers/image_controller.ex

@@ -4,11 +4,11 @@ defmodule MusicLibraryWeb.ImageController do
   alias MusicLibrary.Records
 
   def show(conn, %{"record_id" => record_id}) do
-    case Records.get_image!(record_id) do
+    case Records.get_cover!(record_id) do
       nil ->
         send_resp(conn, 404, "Not found")
 
-      %{image_data: image_data, image_data_hash: etag} ->
+      %{cover_data: cover_data, cover_hash: etag} ->
         case get_req_header(conn, "if-none-match") do
           [^etag] ->
             send_resp(conn, 304, "")
@@ -17,7 +17,7 @@ defmodule MusicLibraryWeb.ImageController do
             conn
             |> put_resp_content_type("image/jpeg", "utf-8")
             |> put_resp_header("etag", etag)
-            |> send_resp(200, image_data)
+            |> send_resp(200, cover_data)
         end
     end
   end