evazion b283281e5e comments: minimize sql queries. ...

Certain parts of comment rendering triggered sql queries that we didn't
really need to do. Rework things to avoid this.

* Preload comment creators in order to display commenter names with link_to_user.

* Preload comment votes in order to display "undo vote" links. Only preload
  votes for members since anonymous users can't vote and don't have "undo
  vote" links.

* Rework various conditionals to do the filtering in Ruby so that we
  avoid issuing any extra queries in sql.

* Avoid issuing any queries at all when the post doesn't have any
  comments (when last_commented_at is blank).

2019-08-20 21:55:25 -05:00

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