How does Reddit sort query their database for “what's hot”?
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14-11-2019 - |
Вопрос
I want to implement something similar on my site.
Submissions have up_votes and down_votes. I'd imagine reddit does some sort of database query that takes into account the up_votes vs. total_votes and maybe factors in # of views and # of comments and limits it all by a specified time period.
What sort of query do you imagine they use to determine this?
Thanks!
Решение
- For links, they use a formula based on upvotes minus downvotes combined with age of the post.
- For comments, they use a confidence sort based on a Wilson score interval.
This blog post describes both formulas in greater detail.
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