# File lib/i18n/backend/active_record/translation.rb, line 63
          def lookup(keys, *separator)
            column_name = connection.quote_column_name('key')
            keys = Array(keys).map! { |key| key.to_s }

            unless separator.empty?
              warn "[DEPRECATION] Giving a separator to Translation.lookup is deprecated. " <<
                "You can change the internal separator by overwriting FLATTEN_SEPARATOR."
            end

            namespace = "#{keys.last}#{I18n::Backend::Flatten::FLATTEN_SEPARATOR}%"
            scoped(:conditions => ["#{column_name} IN (?) OR #{column_name} LIKE ?", keys, namespace])
          end