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Adding hot ranking in sql, post listing view
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6 changed files with 28 additions and 3 deletions
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@ -1,2 +1,4 @@
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drop function hot_rank;
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drop view post_listing;
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drop table post_like;
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drop table post;
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@ -14,5 +14,7 @@ create table post_like (
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post_id int references post on update cascade on delete cascade not null,
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fedi_user_id text not null,
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score smallint not null, -- -1, or 1 for dislike, like, no row for no opinion
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published timestamp not null default now()
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published timestamp not null default now(),
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unique(post_id, fedi_user_id)
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);
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@ -0,0 +1,2 @@
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drop view post_listing;
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drop function hot_rank;
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20
server/migrations/2019-03-30-212058_post_listing/up.sql
Normal file
20
server/migrations/2019-03-30-212058_post_listing/up.sql
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-- Rank = ScaleFactor * sign(Score) * log(1 + abs(Score)) / (Time + 2)^Gravity
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create or replace function hot_rank(
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score numeric,
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published timestamp without time zone)
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returns numeric as $$
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begin
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-- hours_diff:=EXTRACT(EPOCH FROM (timezone('utc',now()) - published))/3600
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return 10000*sign(score)*log(1 + abs(score)) / power(((EXTRACT(EPOCH FROM (timezone('utc',now()) - published))/3600) + 2), 1.8);
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end; $$
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LANGUAGE plpgsql;
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create view post_listing as
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select post.*,
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(select count(*) from comment where comment.post_id = post.id) as number_of_comments,
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coalesce(sum(post_like.score),0) as score,
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hot_rank(coalesce(sum(post_like.score),0), post.published) as hot_rank
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from post
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left join post_like
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on post.id = post_like.post_id
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group by post.id;
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@ -152,7 +152,7 @@ impl CommentView {
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for like in likes.iter() {
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if like.score == 1 {
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upvotes += 1
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upvotes += 1;
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} else if like.score == -1 {
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downvotes += 1;
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}
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@ -424,7 +424,6 @@ export class CommentForm extends Component<CommentFormProps, CommentFormState> {
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}
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}
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render() {
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return (
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<div>
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