gitlab-org--gitlab-foss/db/migrate/20190830140240_add_duplicated_to_to_issue.rb

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# frozen_string_literal: true
class AddDuplicatedToToIssue < ActiveRecord::Migration[5.2]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
disable_ddl_transaction!
def up
add_column :issues, :duplicated_to_id, :integer unless duplicated_to_id_exists?
add_concurrent_foreign_key :issues, :issues, column: :duplicated_to_id, on_delete: :nullify
add_concurrent_index :issues, :duplicated_to_id, where: 'duplicated_to_id IS NOT NULL'
end
def down
remove_foreign_key_without_error(:issues, column: :duplicated_to_id)
remove_concurrent_index(:issues, :duplicated_to_id)
remove_column(:issues, :duplicated_to_id) if duplicated_to_id_exists?
end
private
def duplicated_to_id_exists?
column_exists?(:issues, :duplicated_to_id)
end
end