[Bug]: Wrong request url and params empty

[gmarziou]

Bug Description

I have an index view with a search form with 6 fields that are mapped to url params.
For testing purpose, I added a condition on name param to raise an error in the controller:

def index
   return if validate_search_params!

    if params[:name] == "XXX"
      raise ActionDispatch::InvalidParameterError.new("Test RED")
    end

So, when I search with name=XXX it triggers an error and RED records it but it does not record the URL params which makes it difficult to debug.
Also, I don't understand why the user_agent is "Rails Application" and request_url is "application.action_dispatch"?

So far, I did not test in production, could it be something specific to development mode?

See the server log below..

Steps to Reproduce

1. Create an exception upon search form processing
2. Review error in dashboard

Expected Behavior

I expect correct values for request_url, params and user agent:

• request_url: http://127.0.0.1:3000/fr/profiles
• request params: {"player_id" => "", "name" => "XXX", "gender" => "", "country_id" => "", "classification" => "", "classification_status" => "", "button" => "", "locale" => "fr"}
• user agent: Firefox...

Ideally, a clickable link in dashboard to reproduce the error.

Actual Behavior

empty params, wrong url and user agent.

Relevant Logs/Screenshots

Started GET "/fr/profiles?player_id=&name=XXX&gender=&country_id=&classification=&classification_status=&button=" for 127.0.0.1 at 2026-04-09 14:38:01 +0200
Processing by ProfilesController#index as HTML
Parameters: {"player_id" => "", "name" => "XXX", "gender" => "", "country_id" => "", "classification" => "", "classification_status" => "", "button" => "", "locale" => "fr"}
Completed 500 Internal Server Error in 2ms (ActiveRecord: 0.0ms (0 queries, 0 cached) | GC: 0.0ms)


[ActiveJob] Enqueued RailsErrorDashboard::AsyncErrorLoggingJob (Job ID: a6fda7b8-d291-4dce-bb16-05909040d252) to Async(default) with arguments: {class_name: "ActionDispatch::InvalidParameterError", message: "Test RED", backtrace: ["/home/gael/Work/parastats/app/controllers/profiles_controller.rb:30:in 'ProfilesController#index'", "/home/gael/.local/share/mise/installs/ruby/4.0.2/lib/ruby/gems/4.0.0/gems/actionpack-8.1.3/lib/action_controller/metal/basic_implicit_render.rb:8:in 'ActionController::BasicImplicitRender#send_action'"], cause_chain: nil}, {user_id: nil, request_url: "application.action_dispatch", request_params: "{}", user_agent: "Rails Application", ip_address: "application_layer", platform: "API", controller_name: "ProfilesController", action_name: nil, http_method: nil, hostname: nil, content_type: nil, request_duration_ms: nil, source: "application.action_dispatch"}

ActionDispatch::InvalidParameterError (Test RED):

app/controllers/profiles_controller.rb:30:in 'ProfilesController#index'
[ActiveJob] [RailsErrorDashboard::AsyncErrorLoggingJob] [a6fda7b8-d291-4dce-bb16-05909040d252] Performing RailsErrorDashboard::AsyncErrorLoggingJob (Job ID: a6fda7b8-d291-4dce-bb16-05909040d252) from Async(default) enqueued at 2026-04-09T12:38:01.842038677Z with arguments: {class_name: "ActionDispatch::InvalidParameterError", message: "Test RED", backtrace: ["/home/gael/Work/parastats/app/controllers/profiles_controller.rb:30:in 'ProfilesController#index'", "/home/gael/.local/share/mise/installs/ruby/4.0.2/lib/ruby/gems/4.0.0/gems/actionpack-8.1.3/lib/action_controller/metal/basic_implicit_render.rb:8:in 'ActionController::BasicImplicitRender#send_action'", "/home/gael/.local/share/mise/installs/ruby/4.0.2/lib/ruby/gems/4.0.0/gems/actionpack-8.1.3/lib/abstract_controller/base.rb:221:in 'AbstractController::Base#process_action'", "/home/gael/.local/share/mise/installs/ruby/4.0.2/lib/ruby/gems/4.0.0/gems/actionpack-8.1.3/lib/action_controller/metal/rendering.rb:199:in 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"ProfilesController", action_name: nil, http_method: nil, hostname: nil, content_type: nil, request_duration_ms: nil, source: "application.action_dispatch"}
[ActiveJob] [RailsErrorDashboard::AsyncErrorLoggingJob] [a6fda7b8-d291-4dce-bb16-05909040d252]   RailsErrorDashboard::Application Load (0.3ms)  SELECT `rails_error_dashboard_applications`.* FROM `rails_error_dashboard_applications` ORDER BY `rails_error_dashboard_applications`.`id` ASC LIMIT 1 /*application='Parastats',job='RailsErrorDashboard%3A%3AAsyncErrorLoggingJob'*/
[ActiveJob] [RailsErrorDashboard::AsyncErrorLoggingJob] [a6fda7b8-d291-4dce-bb16-05909040d252] Performed RailsErrorDashboard::AsyncErrorLoggingJob (Job ID: a6fda7b8-d291-4dce-bb16-05909040d252) from Async(default) in 13.06ms

Gem Version

0.5.11

Rails Version

8.1.3

Ruby Version

4.0.2

Database

MySQL

Additional Context

No response

Pre-submission Checklist

• I have searched existing issues to ensure this is not a duplicate
• I have read the documentation and troubleshooting guide
• I can reliably reproduce this issue

[gmarziou]

I also tested in production and the behavior is the same which is rather reassuring in a way.

[gmarziou]

Here is the log file with internal logging set to debug, synchronous logging and only 10 lines of backtrace

Started GET "/fr/profiles?player_id=&name=XXX&gender=&country_id=&classification=&classification_status=&button=" for 127.0.0.1 at 2026-04-10 01:33:43 +0200
Processing by ProfilesController#index as HTML
  Parameters: {"player_id" => "", "name" => "XXX", "gender" => "", "country_id" => "", "classification" => "", "classification_status" => "", "button" => "", "locale" => "fr"}
Completed 500 Internal Server Error in 2ms (ActiveRecord: 0.0ms (0 queries, 0 cached) | GC: 0.0ms)


  RailsErrorDashboard::Application Load (0.5ms)  SELECT `rails_error_dashboard_applications`.* FROM `rails_error_dashboard_applications` WHERE `rails_error_dashboard_applications`.`name` = 'Parastats' LIMIT 1 /*action='index',application='Parastats',controller='profiles'*/
  RailsErrorDashboard::ErrorLog Load (0.9ms)  SELECT `rails_error_dashboard_error_logs`.* FROM `rails_error_dashboard_error_logs` WHERE `rails_error_dashboard_error_logs`.`resolved` = FALSE AND `rails_error_dashboard_error_logs`.`error_hash` = 'e328e78b601b5717' AND `rails_error_dashboard_error_logs`.`application_id` = 1 AND (occurred_at >= '2026-04-08 23:33:43.675707') ORDER BY `rails_error_dashboard_error_logs`.`last_seen_at` DESC LIMIT 1 FOR UPDATE /*action='index',application='Parastats',controller='profiles'*/
  TRANSACTION (0.5ms)  BEGIN /*action='index',application='Parastats',controller='profiles'*/
  RailsErrorDashboard::ErrorLog Update (1.9ms)  UPDATE `rails_error_dashboard_error_logs` SET `rails_error_dashboard_error_logs`.`last_seen_at` = '2026-04-09 23:33:43.688412', `rails_error_dashboard_error_logs`.`occurrence_count` = 9, `rails_error_dashboard_error_logs`.`updated_at` = '2026-04-09 23:33:43.690851' WHERE `rails_error_dashboard_error_logs`.`id` = 4 /*action='index',application='Parastats',controller='profiles'*/
  TRANSACTION (15.2ms)  COMMIT /*action='index',application='Parastats',controller='profiles'*/
  RailsErrorDashboard::ErrorLog Pluck (0.4ms)  SELECT DISTINCT `rails_error_dashboard_error_logs`.`platform` FROM `rails_error_dashboard_error_logs` /*action='index',application='Parastats',controller='profiles'*/
  Rendered /home/gael/.local/share/mise/installs/ruby/4.0.2/lib/ruby/gems/4.0.0/gems/rails_error_dashboard-0.5.11/app/views/rails_error_dashboard/errors/_error_row.html.erb (Duration: 3.4ms | GC: 0.0ms)
[RailsErrorDashboard] Failed to broadcast error update: ActionView::Template::Error - undefined method 'error_path' for an instance of #<Class:0x00007fe30825e6b0>
[RailsErrorDashboard] Backtrace: /home/gael/.local/share/mise/installs/ruby/4.0.2/lib/ruby/gems/4.0.0/gems/railties-8.1.3/lib/rails/engine/lazy_route_set.rb:96:in 'method_missing'
/home/gael/.local/share/mise/installs/ruby/4.0.2/lib/ruby/gems/4.0.0/gems/rails_error_dashboard-0.5.11/app/views/rails_error_dashboard/errors/_error_row.html.erb:6:in '__home_gael__local_share_mise_installs_ruby_______lib_ruby_gems_______gems_rails_error_dashboard________app_views_rails_error_dashboard_errors__error_row_html_erb___2302825920994865627_24656'
/home/gael/.local/share/mise/installs/ruby/4.0.2/lib/ruby/gems/4.0.0/gems/actionview-8.1.3/lib/action_view/base.rb:281:in 'Kernel#public_send'
  TRANSACTION (0.3ms)  BEGIN /*action='index',application='Parastats',controller='profiles'*/
  RailsErrorDashboard::ErrorOccurrence Create (1.7ms)  INSERT INTO `rails_error_dashboard_error_occurrences` (`error_log_id`, `occurred_at`, `user_id`, `request_id`, `session_id`, `created_at`, `updated_at`) VALUES (4, '2026-04-09 23:33:43.662073', NULL, NULL, NULL, '2026-04-09 23:33:43.725198', '2026-04-09 23:33:43.725198') /*action='index',application='Parastats',controller='profiles'*/
  TRANSACTION (10.3ms)  COMMIT /*action='index',application='Parastats',controller='profiles'*/
  RailsErrorDashboard::ErrorLog Count (0.6ms)  SELECT COUNT(*) FROM `rails_error_dashboard_error_logs` WHERE `rails_error_dashboard_error_logs`.`error_type` = 'ActionDispatch::InvalidParameterError' AND `rails_error_dashboard_error_logs`.`platform` = 'API' AND (occurred_at >= '2026-04-09 00:00:00') /*action='index',application='Parastats',controller='profiles'*/
  RailsErrorDashboard::ErrorBaseline Load (2.5ms)  SELECT `rails_error_dashboard_error_baselines`.* FROM `rails_error_dashboard_error_baselines` WHERE `rails_error_dashboard_error_baselines`.`error_type` = 'ActionDispatch::InvalidParameterError' AND `rails_error_dashboard_error_baselines`.`platform` = 'API' AND `rails_error_dashboard_error_baselines`.`baseline_type` = 'hourly' ORDER BY `rails_error_dashboard_error_baselines`.`period_start` DESC LIMIT 1 /*action='index',application='Parastats',controller='profiles'*/
  RailsErrorDashboard::ErrorBaseline Load (0.4ms)  SELECT `rails_error_dashboard_error_baselines`.* FROM `rails_error_dashboard_error_baselines` WHERE `rails_error_dashboard_error_baselines`.`error_type` = 'ActionDispatch::InvalidParameterError' AND `rails_error_dashboard_error_baselines`.`platform` = 'API' AND `rails_error_dashboard_error_baselines`.`baseline_type` = 'daily' ORDER BY `rails_error_dashboard_error_baselines`.`period_start` DESC LIMIT 1 /*action='index',application='Parastats',controller='profiles'*/
  RailsErrorDashboard::ErrorBaseline Load (0.3ms)  SELECT `rails_error_dashboard_error_baselines`.* FROM `rails_error_dashboard_error_baselines` WHERE `rails_error_dashboard_error_baselines`.`error_type` = 'ActionDispatch::InvalidParameterError' AND `rails_error_dashboard_error_baselines`.`platform` = 'API' AND `rails_error_dashboard_error_baselines`.`baseline_type` = 'weekly' ORDER BY `rails_error_dashboard_error_baselines`.`period_start` DESC LIMIT 1 /*action='index',application='Parastats',controller='profiles'*/
  
ActionDispatch::InvalidParameterError (Test RED):
  
app/controllers/profiles_controller.rb:30:in 'ProfilesController#index'

[gmarziou]

Is this log meaningful?

[RailsErrorDashboard] Failed to broadcast error update: ActionView::Template::Error - undefined method 'error_path' for an instance of #<Class:0x00007fe30825e6b0>

[AnjanJ]

Hey @gmarziou, thank you for the detailed bug report with logs — that made diagnosing this much easier.

This is fixed in v0.5.12 (just released). All three issues you reported are resolved:

1. Wrong request_url, empty params, wrong user_agent

Root cause: Rails' ActionDispatch::Executor middleware calls Rails.error.report() with source: "application.action_dispatch" but passes no request object in the context. Our error subscriber received this report and logged placeholder values (request_url: "application.action_dispatch", user_agent: "Rails Application", request_params: {}).

With async logging enabled, this created a race condition — two jobs were enqueued for the same exception (one from the subscriber, one from our Rack middleware), and non-deterministic job ordering meant the subscriber's placeholder values could overwrite the middleware's correct data.

Fix: Our middleware now stores the Rack env in Thread.current so the subscriber can build a proper ActionDispatch::Request and capture the real URL, params, user agent, IP, controller, and action. We also deduplicate reports so only one job is enqueued per exception — no more occurrence_count inflation.

2. request_params always {}

We found a second bug: even with the request context fix, params were lost in async mode. The ErrorContext value object was created twice (once in the subscriber, once in the async job), and the second creation didn't preserve the already-extracted params. Fixed.

3. undefined method 'error_path' broadcast error

Yes — that log you posted was meaningful! The Turbo Stream broadcast rendered the _error_row partial outside the engine's routing context, where error_path isn't available. Fixed by using rails_error_dashboard.error_path() (engine-prefixed helper).

Upgrade

gem "rails_error_dashboard", "~> 0.5.12"

No migration needed. The fix is purely in the error capture and display logic.

Could you verify the fix on your end and close this issue if everything looks correct? If the issue persists, please reopen and we'll dig deeper.

[gmarziou]

Hey @AnjanJ the fix works perfectly, thanks.