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30990006a9
This reduces chances of errors where consumers of strings mutate inputs and reduces memory usage of the app. Test suite passes now, but there may be some stuff left, so we will run a few sites on a branch prior to merging
31 lines
586 B
Ruby
31 lines
586 B
Ruby
# frozen_string_literal: true
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class MakePostNumberDistinct < ActiveRecord::Migration[4.2]
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def up
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DB.exec('update posts p
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set post_number = calc
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from
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(
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select
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id,
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post_number,
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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 (
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select topic_id from posts
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group by topic_id, post_number
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having count(*)>1
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)
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) as X
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where calc <> p.post_number and X.id = p.id')
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end
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def down
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# don't want to mess with the index ... its annoying
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raise ActiveRecord::IrreversibleMigration
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end
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end
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