discourse/db/migrate/20121123054127_make_post_nu...

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# frozen_string_literal: true
class MakePostNumberDistinct < ActiveRecord::Migration[4.2]
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def up
DB.exec('update posts p
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set post_number = calc
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from
(
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select
id,
post_number,
topic_id,
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row_number() over (partition by topic_id order by post_number, created_at) calc
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from posts
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where topic_id in (
select topic_id from posts
group by topic_id, post_number
having count(*)>1
)
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) as X
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where calc <> p.post_number and X.id = p.id')
end
def down
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# don't want to mess with the index ... its annoying
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raise ActiveRecord::IrreversibleMigration
end
end