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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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app/models/post.rb
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@@ -51,7 +51,7 @@ class Post < ApplicationRecord
has_many :appeals, :class_name => "PostAppeal", :dependent => :destroy
has_many :votes, :class_name => "PostVote", :dependent => :destroy
has_many :notes, :dependent => :destroy
has_many :comments, -> {includes(:creator, :updater).order("comments.id")}, :dependent => :destroy
has_many :comments, -> {order("comments.id")}, :dependent => :destroy
has_many :children, -> {order("posts.id")}, :class_name => "Post", :foreign_key => "parent_id"
has_many :approvals, :class_name => "PostApproval", :dependent => :destroy
has_many :disapprovals, :class_name => "PostDisapproval", :dependent => :destroy