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# frozen_string_literal: true
class AddUniqueConstraintToSoftwareLicenses < ActiveRecord::Migration[5.2]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
NEW_INDEX = 'index_software_licenses_on_unique_name'
OLD_INDEX = 'index_software_licenses_on_name'
disable_ddl_transaction!
# 12 software licenses will be removed on GitLab.com
# 0 software license policies will be updated on GitLab.com
def up(attempts: 100)
remove_redundant_software_licenses!
add_concurrent_index :software_licenses, :name, unique: true, name: NEW_INDEX
remove_concurrent_index :software_licenses, :name, name: OLD_INDEX
rescue ActiveRecord::RecordNotUnique
retry if (attempts -= 1) > 0
raise StandardError, <<~EOS
Failed to add an unique index to software_licenses, despite retrying the
migration 100 times.
See https://gitlab.com/gitlab-org/gitlab/merge_requests/19840.
EOS
end
def down
remove_concurrent_index :software_licenses, :name, unique: true, name: NEW_INDEX
add_concurrent_index :software_licenses, :name, name: OLD_INDEX
end
private
def remove_redundant_software_licenses!
redundant_software_licenses = execute <<~SQL
SELECT min(id) id, name
FROM software_licenses
WHERE name IN (select name from software_licenses group by name having count(name) > 1)
GROUP BY name
SQL
say "Detected #{redundant_software_licenses.count} duplicates."
redundant_software_licenses.each_row do |id, name|
say_with_time("Reassigning policies that reference software license #{name}.") do
duplicates = software_licenses.where.not(id: id).where(name: name)
software_license_policies
.where(software_license_id: duplicates)
.update_all(software_license_id: id)
duplicates.delete_all
end
end
end
def table(name)
Class.new(ActiveRecord::Base) { self.table_name = name }
end
def software_licenses
@software_licenses ||= table(:software_licenses)
end
def software_license_policies
@software_license_policies ||= table(:software_license_policies)
end
end
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