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comments: minimize sql queries.

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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).
This commit is contained in:
evazion
2019-08-20 20:53:40 -05:00
parent 2cf929ad6e
commit b283281e5e
9 changed files with 30 additions and 60 deletions
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2
app/views/posts/show.html.erb
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@@ -120,7 +120,7 @@
<% if !CurrentUser.user.is_builder? %>
<h2>Before commenting, read the <%= link_to "how to comment guide", wiki_pages_path(:search => {:title => "howto:comment"}) %>.</h2>
<% end %>
<%= render "comments/partials/index/list", :comments => @post.comments.visible(CurrentUser.user).includes(:creator), :post => @post, :show_header => false %>
<%= render "comments/partials/index/list", comments: @comments, post: @post, page: :post %>
</section>
<section id="notes" style="display: none;">