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# Every controller-level exception (the 500s) in one lean file,
# independent of the base log level -- log/production.log can stay
# quiet without losing error visibility.
if Rails.env.production?
error_logger = ActiveSupport::Logger.new(Rails.root.join("log", "errors.log"))
ActiveSupport::Notifications.subscribe("process_action.action_controller") do |*, payload|
if (exception = payload[:exception_object])
status = ActionDispatch::ExceptionWrapper.status_code_for_exception(exception.class.name)
next if status < 500
error_logger.error(
"#{Time.now.iso8601} [#{status}] #{payload[:controller]}##{payload[:action]} #{payload[:path]} " \
"-- #{exception.class}: #{exception.message}\n " +
Array(exception.backtrace).first(5).join("\n ")
)
end
end
end
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