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Exclude older topics from the first x rows in "Hot"

This commit is contained in:
Robin Ward 2013-04-02 11:15:04 -04:00
parent 9e269fbc7c
commit 422dbbd25a
1 changed files with 39 additions and 26 deletions
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23
app/models/hot_topic.rb
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@ -15,7 +15,7 @@ class HotTopic < ActiveRecord::Base
hot_percentile = 0.2 # What percentile of topics we consider good
older_percentage = 0.2 # how many old topics we want as a percentage
new_days = 21 # how many days old we consider old
no_old_in_first_x_rows = 8 # don't show old results in the first x rows
# Include all sticky uncategorized on Hot
exec_sql("INSERT INTO hot_topics (topic_id, score)
@ -28,10 +28,11 @@ class HotTopic < ActiveRecord::Base
AND t.category_id IS NULL")
# Include high percentile recent topics
exec_sql("INSERT INTO hot_topics (topic_id, category_id, score)
inserted_count = exec_sql("INSERT INTO hot_topics (topic_id, category_id, score)
SELECT t.id,
t.category_id,
((1.0 - (EXTRACT(EPOCH FROM CURRENT_TIMESTAMP-t.created_at)/86400) / :days_ago) * 0.95) + (RANDOM() * 0.05)
((1.0 - (EXTRACT(EPOCH FROM CURRENT_TIMESTAMP-t.created_at)/86400) / :days_ago) * 0.95) +
(RANDOM() * 0.05)
FROM topics AS t
WHERE t.deleted_at IS NULL
AND t.visible
@ -48,11 +49,22 @@ class HotTopic < ActiveRecord::Base
private_message: Archetype::private_message,
days_ago: new_days)
max_old_score = 1.0
# Finding the highest score in the first x rows
if HotTopic.count > no_old_in_first_x_rows
max_old_score = HotTopic.order('score desc').limit(no_old_in_first_x_rows).last.score
end
# Add a sprinkling of random older topics
exec_sql("INSERT INTO hot_topics (topic_id, category_id, score)
SELECT t.id,
t.category_id,
RANDOM()
RANDOM() * :max_old_score
FROM topics AS t
WHERE t.deleted_at IS NULL
AND t.visible
@ -67,7 +79,8 @@ class HotTopic < ActiveRecord::Base
hot_percentile: hot_percentile,
limit: (older_percentage * max_hot_topics).round,
private_message: Archetype::private_message,
days_ago: new_days)
days_ago: new_days,
max_old_score: max_old_score)
end
end