34 lines
1.2 KiB
Ruby
34 lines
1.2 KiB
Ruby
class MigrateWordCounts < ActiveRecord::Migration
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disable_ddl_transaction!
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def up
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post_ids = execute("SELECT id FROM posts WHERE word_count IS NULL LIMIT 500").map {|r| r['id'].to_i }
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while post_ids.length > 0
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3.times do
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begin
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execute "UPDATE posts SET word_count = COALESCE(array_length(regexp_split_to_array(raw, ' '),1), 0) WHERE id IN (#{post_ids.join(',')})"
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break
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rescue PG::Error
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# Deadlock. Try again, up to 3 times.
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end
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end
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post_ids = execute("SELECT id FROM posts WHERE word_count IS NULL LIMIT 500").map {|r| r['id'].to_i }
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end
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topic_ids = execute("SELECT id FROM topics WHERE word_count IS NULL LIMIT 500").map {|r| r['id'].to_i }
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while topic_ids.length > 0
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3.times do
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begin
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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(',')})"
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break
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rescue PG::Error
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# Deadlock. Try again, up to 3 times.
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end
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end
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topic_ids = execute("SELECT id FROM topics WHERE word_count IS NULL LIMIT 500").map {|r| r['id'].to_i }
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end
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end
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end
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