class method self.db_warnings_action=

# File activerecord/lib/active_record.rb, line 220
  def self.db_warnings_action=(action)
    @db_warnings_action =
      case action
      when :ignore
        nil
      when :log
        ->(warning) do
          warning_message = "[#{warning.class}] #{warning.message}"
          warning_message += " (#{warning.code})" if warning.code
          ActiveRecord::Base.logger.warn(warning_message)
        end
      when :raise
        ->(warning) { raise warning }
      when :report
        ->(warning) { Rails.error.report(warning, handled: true) }
      when Proc
        action
      else
        raise ArgumentError, "db_warnings_action must be one of :ignore, :log, :raise, :report, or a custom proc."
      end
  end