75 lines
2.2 KiB
Ruby
75 lines
2.2 KiB
Ruby
class ScoreCalculator
|
|
|
|
def self.default_score_weights
|
|
{
|
|
reply_count: 5,
|
|
like_score: 15,
|
|
incoming_link_count: 5,
|
|
bookmark_count: 2,
|
|
avg_time: 0.05,
|
|
reads: 0.2
|
|
}
|
|
end
|
|
|
|
def initialize(weightings=nil)
|
|
@weightings = weightings || ScoreCalculator.default_score_weights
|
|
end
|
|
|
|
# Calculate the score for all posts based on the weightings
|
|
def calculate
|
|
|
|
# First update the scores of the posts
|
|
exec_sql(post_score_sql, @weightings)
|
|
|
|
# Update the percent rankings of the posts
|
|
|
|
exec_sql("UPDATE posts SET percent_rank = x.percent_rank
|
|
FROM (SELECT id, percent_rank()
|
|
OVER (PARTITION BY topic_id ORDER BY SCORE DESC) as percent_rank
|
|
FROM posts) AS x
|
|
WHERE x.id = posts.id")
|
|
|
|
|
|
# Update the topics
|
|
exec_sql "UPDATE topics AS t
|
|
SET has_best_of = (t.like_count >= :likes_required AND
|
|
t.posts_count >= :posts_required AND
|
|
x.max_score >= :score_required),
|
|
score = x.avg_score
|
|
FROM (SELECT p.topic_id,
|
|
MAX(p.score) AS max_score,
|
|
AVG(p.score) AS avg_score
|
|
FROM posts AS p
|
|
GROUP BY p.topic_id) AS x
|
|
WHERE x.topic_id = t.id",
|
|
likes_required: SiteSetting.best_of_likes_required,
|
|
posts_required: SiteSetting.best_of_posts_required,
|
|
score_required: SiteSetting.best_of_score_threshold
|
|
|
|
# Update percentage rank of topics
|
|
exec_sql("UPDATE topics SET percent_rank = x.percent_rank
|
|
FROM (SELECT id, percent_rank()
|
|
OVER (ORDER BY SCORE DESC) as percent_rank
|
|
FROM topics) AS x
|
|
WHERE x.id = topics.id")
|
|
end
|
|
|
|
|
|
private
|
|
|
|
def exec_sql(sql, params=nil)
|
|
ActiveRecord::Base.exec_sql(sql, params)
|
|
end
|
|
|
|
# Generate a SQL statement to update the scores of all posts
|
|
def post_score_sql
|
|
"UPDATE posts SET score = ".tap do |sql|
|
|
components = []
|
|
@weightings.keys.each do |k|
|
|
components << "COALESCE(#{k.to_s}, 0) * :#{k.to_s}"
|
|
end
|
|
sql << components.join(" + ")
|
|
end
|
|
end
|
|
end
|