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Use COALESCE in case there are no posts in a topic

This commit is contained in:
Robin Ward 2013-12-10 17:26:46 -05:00
parent 557f6ff499
commit 8fd9776e43
1 changed files with 2 additions and 2 deletions
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db/migrate/20131210181901_migrate_word_counts.rb
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@ -5,13 +5,13 @@ class MigrateWordCounts < ActiveRecord::Migration
post_ids = execute("SELECT id FROM posts WHERE word_count IS NULL LIMIT 500").map {|r| r['id'].to_i }
while post_ids.length > 0
execute "UPDATE posts SET word_count = array_length(regexp_split_to_array(raw, ' '),1) WHERE id IN (#{post_ids.join(',')})"
execute "UPDATE posts SET word_count = COALESCE(array_length(regexp_split_to_array(raw, ' '),1), 0) WHERE id IN (#{post_ids.join(',')})"
post_ids = execute("SELECT id FROM posts WHERE word_count IS NULL LIMIT 500").map {|r| r['id'].to_i }
end
topic_ids = execute("SELECT id FROM topics WHERE word_count IS NULL LIMIT 500").map {|r| r['id'].to_i }
while topic_ids.length > 0
execute "UPDATE topics SET word_count = (SELECT SUM(COALESCE(posts.word_count, 0)) FROM posts WHERE posts.topic_id = topics.id) WHERE topics.id IN (#{topic_ids.join(',')})"
execute "UPDATE topics SET word_count = COALESCE((SELECT SUM(COALESCE(posts.word_count, 0)) FROM posts WHERE posts.topic_id = topics.id), 0) WHERE topics.id IN (#{topic_ids.join(',')})"
topic_ids = execute("SELECT id FROM topics WHERE word_count IS NULL LIMIT 500").map {|r| r['id'].to_i }
end