1 files changed, 20 insertions, 0 deletions

diff --git a/config/initializers/error_log.rb b/config/initializers/error_log.rb
new file mode 100644
index 0000000..74117cb
--- /dev/null
+++ b/config/initializers/error_log.rb
@@ -0,0 +1,20 @@
+# 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
+