Return the corresponding object id in attachment view

lib/pleroma/web/common_api/utils.ex

@@ -37,7 +37,7 @@ defmodule Pleroma.Web.CommonAPI.Utils do
 
   def attachments_from_ids_no_descs(ids) do
     Enum.map(ids, fn media_id ->
-      case Repo.get(Object, media_id) do
+      case get_attachment(media_id) do
         %Object{data: data} -> data
         _ -> nil
       end
@@ -51,13 +51,17 @@ defmodule Pleroma.Web.CommonAPI.Utils do
     {_, descs} = Jason.decode(descs_str)
 
     Enum.map(ids, fn media_id ->
-      with %Object{data: data} <- Repo.get(Object, media_id) do
+      with %Object{data: data} <- get_attachment(media_id) do
         Map.put(data, "name", descs[media_id])
       end
     end)
     |> Enum.reject(&is_nil/1)
   end
 
+  defp get_attachment(media_id) do
+    Repo.get(Object, media_id)
+  end
+
   @spec get_to_and_cc(ActivityDraft.t()) :: {list(String.t()), list(String.t())}
 
   def get_to_and_cc(%{in_reply_to_conversation: %Participation{} = participation}) do

lib/pleroma/web/mastodon_api/views/status_view.ex

@@ -523,10 +523,19 @@ defmodule Pleroma.Web.MastodonAPI.StatusView do
         true -> "unknown"
       end
 
-    <<hash_id::signed-32, _rest::binary>> = :crypto.hash(:md5, href)
+    attachment_id =
+      with {_, ap_id} when is_binary(ap_id) <- {:ap_id, attachment["id"]},
+           {_, %Object{data: _object_data, id: object_id}} <-
+             {:object, Object.get_by_ap_id(ap_id)} do
+        to_string(object_id)
+      else
+        _ ->
+          <<hash_id::signed-32, _rest::binary>> = :crypto.hash(:md5, href)
+          to_string(attachment["id"] || hash_id)
+      end
 
     %{
-      id: to_string(attachment["id"] || hash_id),
+      id: attachment_id,
       url: href,
       remote_url: href,
       preview_url: href_preview,