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127 lines
6.2 KiB
Ruby
127 lines
6.2 KiB
Ruby
class HotTopic < ActiveRecord::Base
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belongs_to :topic
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belongs_to :category
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# Here's the current idea behind the implementaiton of hot: random can produce good results!
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# Hot is currently made up of a random selection of high percentile topics. It includes mostly
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# new topics, but also some old ones for variety.
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def self.refresh!
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transaction do
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exec_sql "DELETE FROM hot_topics"
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# TODO, move these to site settings once we're sure this is how we want to figure out hot
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max_hot_topics = 200 # how many hot topics we want
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hot_percentile = 0.2 # What percentile of topics we consider good
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older_percentage = 0.2 # how many old topics we want as a percentage
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new_days = 21 # how many days old we consider old
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no_old_in_first_x_rows = 8 # don't show old results in the first x rows
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# Include all sticky uncategorized on Hot
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exec_sql("INSERT INTO hot_topics (topic_id,
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random_bias,
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random_multiplier,
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days_ago_bias,
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days_ago_multiplier,
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score,
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hot_topic_type)
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SELECT t.id,
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calc.random_bias,
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1.0,
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0,
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1.0,
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calc.random_bias,
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1
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FROM topics AS t
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INNER JOIN (SELECT id, RANDOM() as random_bias
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FROM topics) AS calc ON calc.id = t.id
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WHERE t.deleted_at IS NULL
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AND t.visible
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AND (NOT t.archived)
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AND t.pinned_at IS NOT NULL
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AND t.category_id IS NULL")
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# Include high percentile recent topics
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inserted_count = exec_sql("INSERT INTO hot_topics (topic_id,
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category_id,
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random_bias,
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random_multiplier,
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days_ago_bias,
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days_ago_multiplier,
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score,
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hot_topic_type)
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SELECT t.id,
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t.category_id,
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calc.random_bias,
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0.05,
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calc.days_ago_bias,
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0.95,
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(calc.random_bias * 0.05) + (days_ago_bias * 0.95),
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2
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FROM topics AS t
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INNER JOIN (SELECT id,
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RANDOM() as random_bias,
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((1.0 - (EXTRACT(EPOCH FROM CURRENT_TIMESTAMP-created_at)/86400) / :days_ago) * 0.95) AS days_ago_bias
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FROM topics) AS calc ON calc.id = t.id
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WHERE t.deleted_at IS NULL
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AND t.visible
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AND (NOT t.closed)
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AND (NOT t.archived)
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AND t.pinned_at IS NULL
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AND t.archetype <> :private_message
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AND created_at >= (CURRENT_TIMESTAMP - INTERVAL ':days_ago' DAY)
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AND t.percent_rank < :hot_percentile
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AND NOT EXISTS(SELECT * FROM hot_topics AS ht2 WHERE ht2.topic_id = t.id)
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LIMIT :limit",
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hot_percentile: hot_percentile,
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limit: ((1.0 - older_percentage) * max_hot_topics).round,
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private_message: Archetype::private_message,
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days_ago: new_days)
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max_old_score = 1.0
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# Finding the highest score in the first x rows
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if HotTopic.count > no_old_in_first_x_rows
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max_old_score = HotTopic.order('score desc').limit(no_old_in_first_x_rows).last.score
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end
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# Add a sprinkling of random older topics
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exec_sql("INSERT INTO hot_topics (topic_id,
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category_id,
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random_bias,
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random_multiplier,
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days_ago_bias,
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days_ago_multiplier,
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score,
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hot_topic_type)
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SELECT t.id,
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t.category_id,
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calc.random_bias,
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:max_old_score,
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0,
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1.0,
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calc.random_bias * :max_old_score,
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3
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FROM topics AS t
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INNER JOIN (SELECT id, RANDOM() as random_bias
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FROM topics) AS calc ON calc.id = t.id
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WHERE t.deleted_at IS NULL
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AND t.visible
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AND (NOT t.closed)
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AND (NOT t.archived)
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AND t.pinned_at IS NULL
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AND t.archetype <> :private_message
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AND created_at < (CURRENT_TIMESTAMP - INTERVAL ':days_ago' DAY)
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AND t.percent_rank < :hot_percentile
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AND NOT EXISTS(SELECT * FROM hot_topics AS ht2 WHERE ht2.topic_id = t.id)
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LIMIT :limit",
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hot_percentile: hot_percentile,
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limit: (older_percentage * max_hot_topics).round,
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private_message: Archetype::private_message,
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days_ago: new_days,
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max_old_score: max_old_score)
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end
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end
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end
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