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