Fix participation requests query

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

lib/pleroma/web/activity_pub/activity_pub.ex

@@ -1246,6 +1246,12 @@ defp restrict_filtered(query, %{blocking_user: %User{} = user}) do
 
   defp restrict_filtered(query, _), do: query
 
+  defp restrict_object(query, %{object: object}) do
+    from(activity in query, where: fragment("?->>'object' = ?", activity.data, ^object))
+  end
+
+  defp restrict_object(query, _), do: query
+
   defp restrict_quote_url(query, %{quote_url: quote_url}) do
     from([_activity, object] in query,
       where: fragment("(?)->'quoteUrl' = ?", object.data, ^quote_url)
@@ -1417,6 +1423,7 @@ def fetch_activities_query(recipients, opts \\ %{}) do
       |> restrict_instance(opts)
       |> restrict_announce_object_actor(opts)
       |> restrict_filtered(opts)
+      |> restrict_object(opts)
       |> restrict_quote_url(opts)
       |> Activity.restrict_deactivated_users()
       |> exclude_poll_votes(opts)

lib/pleroma/web/pleroma_api/controllers/event_controller.ex

@@ -129,10 +129,12 @@ def participation_requests(
     case activity do
       %Activity{actor: ^user_ap_id, data: %{"object" => ap_id}} ->
         params =
-          params
-          |> Map.put(:type, "Join")
-          |> Map.put(:object, ap_id)
-          |> Map.put(:state, "pending")
+          Map.merge(params, %{
+            type: "Join",
+            object: ap_id,
+            state: "pending",
+            skip_preload: true
+          })
 
         activities =
           []