user = User.first

result = user.user_books.in_order_of(:status, %w[to_read currently_reading read])

=> #<ActiveRecord::Relation [#<UserBook id: 3, user_id: 1, status: "to_read">, #<UserBook id: 4, user_id: 1, status: "to_read">, #<UserBook id: 5, user_id: 1, status: "currently_reading">, #<UserBook id: 6, user_id: 1, status: "read">]>