discourse/db/migrate/20210311070755_add_image_up...

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# frozen_string_literal: true
class AddImageUploadIdToBadges < ActiveRecord::Migration[6.0]
def change
add_column :badges, :image_upload_id, :integer
reversible do |dir|
dir.up do
DB.exec <<~SQL
UPDATE badges b1
SET image_upload_id = u.id
FROM (
SELECT id, (regexp_matches(b.image, '[a-f0-9]{40}'))[1] as sha1
FROM badges b
WHERE
b.image IS NOT NULL AND
b.image ~ '[a-f0-9]{40}'
) b2
JOIN uploads u ON u.sha1 = b2.sha1
WHERE
b1.id = b2.id
SQL
end
end
end
end