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PERF: new table used for title similarity search

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This commit is contained in:
Sam
2014-08-08 15:50:26 +10:00
parent cd20c8e55f
commit c1cbf1b269
5 changed files with 45 additions and 4 deletions
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6
app/models/topic.rb
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@@ -358,12 +358,13 @@ class Topic < ActiveRecord::Base
archetype == Archetype.private_message
end
MAX_SIMILAR_BODY_LENGTH = 200
# Search for similar topics
def self.similar_to(title, raw, user=nil)
return [] unless title.present?
return [] unless raw.present?
filter_words = Search.prepare_data(title + " " + raw[0...200]);
filter_words = Search.prepare_data(title + " " + raw[0...MAX_SIMILAR_BODY_LENGTH]);
ts_query = Search.ts_query(filter_words, nil, "|")
# Exclude category definitions from similar topic suggestions
@@ -371,8 +372,7 @@ class Topic < ActiveRecord::Base
candidates = Topic.visible
.secured(Guardian.new(user))
.listable_topics
.joins('JOIN posts p ON p.topic_id = topics.id AND p.post_number = 1')
.joins('JOIN post_search_data s ON p.id = s.post_id')
.joins('JOIN topic_search_data s ON topics.id = s.topic_id')
.where("search_data @@ #{ts_query}")
.order("ts_rank(search_data, #{ts_query}) DESC")
.limit(SiteSetting.max_similar_results * 3)