CHANGELOG.md

@@ -14,6 +14,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ## Added
 - Implement [FEP-67ff](https://codeberg.org/fediverse/fep/src/branch/main/fep/67ff/fep-67ff.md) (federation documentation)
 
+## Fixed
+- Meilisearch: order of results returned from our REST API now actually matches how Meilisearch ranks results
+
 ## 2024.04
 
 ## Added

lib/pleroma/activity.ex

@@ -258,6 +258,27 @@ def get_create_by_object_ap_id(ap_id) when is_binary(ap_id) do
 
   def get_create_by_object_ap_id(_), do: nil
 
+  @doc """
+  Accepts a list of `ap__id`.
+  Returns a query yielding Create activities for the given objects,
+  in the same order as they were specified in the input list.
+  """
+  @spec get_presorted_create_by_object_ap_id([String.t()]) :: Ecto.Queryable.t()
+  def get_presorted_create_by_object_ap_id(ap_ids) do
+    from(
+      a in Activity,
+      join:
+        ids in fragment(
+          "SELECT * FROM UNNEST(?::text[]) WITH ORDINALITY AS ids(ap_id, ord)",
+          ^ap_ids
+        ),
+      on:
+        ids.ap_id == fragment("?->>'object'", a.data) and
+          fragment("?->>'type'", a.data) == "Create",
+      order_by: [asc: ids.ord]
+    )
+  end
+
   @doc """
   Accepts `ap_id` or list of `ap_id`.
   Returns a query.

lib/pleroma/search/meilisearch.ex

@@ -5,7 +5,6 @@ defmodule Pleroma.Search.Meilisearch do
   alias Pleroma.Activity
 
   import Pleroma.Search.DatabaseSearch
-  import Ecto.Query
 
   @behaviour Pleroma.Search.SearchBackend
 
@@ -91,14 +90,13 @@ def search(user, query, options \\ []) do
 
       try do
         hits
-        |> Activity.create_by_object_ap_id()
+        |> Activity.get_presorted_create_by_object_ap_id()
         |> Activity.with_preloaded_object()
         |> Activity.restrict_deactivated_users()
         |> maybe_restrict_local(user)
         |> maybe_restrict_author(author)
         |> maybe_restrict_blocked(user)
         |> maybe_fetch(user, query)
-        |> order_by([object: obj], desc: obj.data["published"])
         |> Pleroma.Repo.all()
       rescue
         _ -> maybe_fetch([], user, query)

test/pleroma/activity_test.exs

@@ -41,6 +41,26 @@ test "returns the activity that created an object" do
     assert activity == found_activity
   end
 
+  test "returns activities by object's AP id in requested presorted order" do
+    a1 = insert(:note_activity)
+    o1 = Object.normalize(a1, fetch: false).data["id"]
+
+    a2 = insert(:note_activity)
+    o2 = Object.normalize(a2, fetch: false).data["id"]
+
+    a3 = insert(:note_activity)
+    o3 = Object.normalize(a3, fetch: false).data["id"]
+
+    a4 = insert(:note_activity)
+    o4 = Object.normalize(a4, fetch: false).data["id"]
+
+    found_activities =
+      Activity.get_presorted_create_by_object_ap_id([o3, o2, o4, o1])
+      |> Repo.all()
+
+    assert found_activities == [a3, a2, a4, a1]
+  end
+
   test "preloading a bookmark" do
     user = insert(:user)
     user2 = insert(:user)