Remove bookmarks assoc and add a fake bookmark assoc instead

lib/pleroma/activity.ex

@@ -10,6 +10,7 @@ defmodule Pleroma.Activity do
   alias Pleroma.Notification
   alias Pleroma.Object
   alias Pleroma.Repo
+  alias Pleroma.User
 
   import Ecto.Changeset
   import Ecto.Query
@@ -36,8 +37,9 @@ defmodule Pleroma.Activity do
     field(:local, :boolean, default: true)
     field(:actor, :string)
     field(:recipients, {:array, :string}, default: [])
+    # This is a fake relation, do not use outside of with_preloaded_bookmark/get_bookmark
+    has_one(:bookmark, Bookmark)
     has_many(:notifications, Notification, on_delete: :delete_all)
-    has_many(:bookmarks, Bookmark, on_delete: :delete_all)
 
     # Attention: this is a fake relation, don't try to preload it blindly and expect it to work!
     # The foreign key is embedded in a jsonb field.
@@ -73,14 +75,18 @@ defmodule Pleroma.Activity do
         )
     )
     |> preload([activity, object], object: object)
-    |> with_preloaded_bookmarks()
   end
 
-  def with_preloaded_bookmarks(query) do
-    query
-    |> preload(:bookmarks)
+  def with_preloaded_bookmark(query, %User{} = user) do
+    from([a] in query,
+      left_join: b in Bookmark,
+      on: b.user_id == ^user.id and b.activity_id == a.id,
+      preload: [bookmark: b]
+    )
   end
 
+  def with_preloaded_bookmark(query, _), do: query
+
   def get_by_ap_id(ap_id) do
     Repo.one(
       from(
@@ -90,6 +96,16 @@ defmodule Pleroma.Activity do
     )
   end
 
+  def get_bookmark(%Activity{} = activity, %User{} = user) do
+    if Ecto.assoc_loaded?(activity.bookmark) do
+      activity.bookmark
+    else
+      Bookmark.get(user.id, activity.id)
+    end
+  end
+
+  def get_bookmark(_, _), do: nil
+
   def change(struct, params \\ %{}) do
     struct
     |> cast(params, [:data])
@@ -112,7 +128,6 @@ defmodule Pleroma.Activity do
           ),
         preload: [object: o]
       )
-      |> with_preloaded_bookmarks()
     )
   end
 
@@ -133,7 +148,6 @@ defmodule Pleroma.Activity do
         ),
       preload: [object: o]
     )
-    |> with_preloaded_bookmarks()
     |> Repo.one()
   end
 
@@ -212,7 +226,6 @@ defmodule Pleroma.Activity do
         ),
       preload: [object: o]
     )
-    |> with_preloaded_bookmarks()
   end
 
   def create_by_object_ap_id_with_object(_), do: nil