David Taylor 913db5d546
PERF: Only load the current user's topic_user for bookmarks list (#17873)
Previously, for every bookmarked topic, all topic_user records were being preloaded. Only the current user's record is actually required.

This commit introduces a new `perform_custom_preload!` API which bookmarkables can use to add custom preloading logic. We use this in topic_bookmarkable to load just the topic_user data we need (in the same way as `topic_list.rb`).

Co-authored-by: Blake Erickson <o.blakeerickson@gmail.com>
2022-08-17 09:40:24 +08:00
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