3 files changed, 9 insertions, 2 deletions
diff --git a/lib/pleroma/conversation.ex b/lib/pleroma/conversation.ex
index 5a2a3fc6d..d9c84cb1b 100644
--- a/lib/pleroma/conversation.ex
+++ b/lib/pleroma/conversation.ex
@@ -13,6 +13,7 @@ defmodule Pleroma.Conversation do
     # This is the context ap id.
     field(:ap_id, :string)
     has_many(:participations, Participation)
+    has_many(:users, through: [:participations, :user])
 
     timestamps()
   end
diff --git a/lib/pleroma/conversation/participation.ex b/lib/pleroma/conversation/participation.ex
index 1a2ceafeb..f200c1df5 100644
--- a/lib/pleroma/conversation/participation.ex
+++ b/lib/pleroma/conversation/participation.ex
@@ -60,6 +60,7 @@ defmodule Pleroma.Conversation.Participation do
       order_by: [desc: p.updated_at]
     )
     |> Pleroma.Pagination.fetch_paginated(params)
+    |> Repo.preload(conversation: [:users])
   end
 
   def for_user_with_last_activity_id(user, params \\ %{}) do
diff --git a/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex b/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex
index 3ffb767b9..c7166ff28 100644
--- a/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex
+++ b/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex
@@ -1594,10 +1594,15 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
 
         last_status = StatusView.render("status.json", %{activity: activity, for: user})
 
+        accounts =
+          AccountView.render("accounts.json", %{
+            users: participation.conversation.users,
+            as: :user
+          })
+
         %{
           id: participation.id |> to_string(),
-          # TODO: Add this.
-          accounts: [],
+          accounts: accounts,
           unread: !participation.read,
           last_status: last_status
         }