Nested query in Arel

nested_query_in_arel.rb

limit = 200
post_table = Post.arel_table
visibility_ids = PostVisibility.select(:post_id).where(user_id: 1).order(id: :desc).limit(limit).arel.as('t')
inner_query = Arel::Table.new(:tmp).project(:post_id).from(visibility_ids.to_sql)
Post.where(post_table[:is_public].eq(true).or(post_table[:id].in(inner_query))).limit(limit)

original.sql

select `posts`.* from `posts`
 where `posts`.is_public = true or `posts`.id in
 (select post_id from (select `post_visibilities`.post_id from `post_visibilities` where `post_visibilities`.user_id = 1
 order by `post_visibilities`.id desc LIMIT 200) as t) order by `posts`.id desc LIMIT 200;