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class FillPagesDomainVerificationCode < ActiveRecord::Migration
DOWNTIME = false
class PagesDomain < ActiveRecord::Base
include EachBatch
end
# Allow this migration to resume if it fails partway through
disable_ddl_transaction!
def up
PagesDomain.where(verification_code: [nil, '']).each_batch do |relation|
connection.execute(set_codes_sql(relation))
# Sleep 2 minutes between batches to not overload the DB with dead tuples
sleep(2.minutes) unless relation.reorder(:id).last == PagesDomain.reorder(:id).last
end
change_column_null(:pages_domains, :verification_code, false)
end
def down
change_column_null(:pages_domains, :verification_code, true)
end
private
def set_codes_sql(relation)
ids = relation.pluck(:id)
whens = ids.map { |id| "WHEN #{id} THEN '#{SecureRandom.hex(16)}'" }
<<~SQL
UPDATE pages_domains
SET verification_code =
CASE id
#{whens.join("\n")}
END
WHERE id IN(#{ids.join(',')})
SQL
end
end
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