rails: uninitialized constant ActiveRecord::Associations::HasManyThroughAssociation

It’s unclear what caused the issue, but we got a one-off error when loading a page in our application:

NameError: uninitialized constant ActiveRecord::Associations::HasManyThroughAssociation

The line of code that triggered the error:

Campaign.includes(steps: :alphabetized_recipients).find(params[:campaign_id])

Stack trace:

[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/reflection.rb:457 :in `association_class`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/reflection.rb:889 :in `association_class`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/associations.rb:162 :in `association`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/associations/preloader.rb:156 :in `block in grouped_records`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/associations/preloader.rb:154 :in `each`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/associations/preloader.rb:154 :in `grouped_records`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/associations/preloader.rb:143 :in `preloaders_for_one`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/associations/preloader.rb:115 :in `preloaders_on`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/associations/preloader.rb:129 :in `block (2 levels) in preloaders_for_hash`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/associations/preloader.rb:128 :in `each`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/associations/preloader.rb:128 :in `flat_map`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/associations/preloader.rb:128 :in `block in preloaders_for_hash`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/associations/preloader.rb:124 :in `each`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/associations/preloader.rb:124 :in `flat_map`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/associations/preloader.rb:124 :in `preloaders_for_hash`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/associations/preloader.rb:113 :in `preloaders_on`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/associations/preloader.rb:103 :in `block in preload`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/associations/preloader.rb:102 :in `each`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/associations/preloader.rb:102 :in `flat_map`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/associations/preloader.rb:102 :in `preload`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/relation.rb:645 :in `block in exec_queries`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/relation.rb:644 :in `each`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/relation.rb:644 :in `exec_queries`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/relation.rb:515 :in `load`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/relation.rb:243 :in `to_a`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/relation/finder_methods.rb:475 :in `find_take`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/relation/finder_methods.rb:105 :in `take`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/relation/finder_methods.rb:442 :in `find_one`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/relation/finder_methods.rb:423 :in `find_with_ids`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/relation/finder_methods.rb:71 :in `find`
[PROJECT_ROOT]/app/controllers/steps_controller.rb:24 :in `campaign`
[PROJECT_ROOT]/app/controllers/steps_controller.rb:7 :in `block (2 levels) in index`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_controller/metal/mime_responds.rb:217 :in `respond_to`
[PROJECT_ROOT]/app/controllers/steps_controller.rb:4 :in `index`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_controller/metal/implicit_render.rb:4 :in `send_action`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/abstract_controller/base.rb:198 :in `process_action`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_controller/metal/rendering.rb:10 :in `process_action`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/abstract_controller/callbacks.rb:20 :in `block in process_action`
[GEM_ROOT]/gems/activesupport-4.2.7.1/lib/active_support/callbacks.rb:117 :in `call`
[GEM_ROOT]/gems/activesupport-4.2.7.1/lib/active_support/callbacks.rb:555 :in `block (2 levels) in compile`
[GEM_ROOT]/gems/activesupport-4.2.7.1/lib/active_support/callbacks.rb:505 :in `call`
[GEM_ROOT]/gems/activesupport-4.2.7.1/lib/active_support/callbacks.rb:92 :in `__run_callbacks__`
[GEM_ROOT]/gems/activesupport-4.2.7.1/lib/active_support/callbacks.rb:778 :in `_run_process_action_callbacks`
[GEM_ROOT]/gems/activesupport-4.2.7.1/lib/active_support/callbacks.rb:81 :in `run_callbacks`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/abstract_controller/callbacks.rb:19 :in `process_action`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_controller/metal/rescue.rb:29 :in `process_action`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_controller/metal/instrumentation.rb:32 :in `block in process_action`
[GEM_ROOT]/gems/activesupport-4.2.7.1/lib/active_support/notifications.rb:164 :in `block in instrument`
[GEM_ROOT]/gems/activesupport-4.2.7.1/lib/active_support/notifications/instrumenter.rb:20 :in `instrument`
[GEM_ROOT]/gems/activesupport-4.2.7.1/lib/active_support/notifications.rb:164 :in `instrument`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_controller/metal/instrumentation.rb:30 :in `process_action`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_controller/metal/params_wrapper.rb:250 :in `process_action`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/railties/controller_runtime.rb:18 :in `process_action`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/abstract_controller/base.rb:137 :in `process`
[GEM_ROOT]/gems/actionview-4.2.7.1/lib/action_view/rendering.rb:30 :in `process`
[GEM_ROOT]/gems/rack-mini-profiler-0.10.1/lib/mini_profiler/profiling_methods.rb:76 :in `block in profile_method`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_controller/metal.rb:196 :in `dispatch`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_controller/metal/rack_delegation.rb:13 :in `dispatch`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_controller/metal.rb:237 :in `block in action`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_dispatch/routing/route_set.rb:74 :in `dispatch`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_dispatch/routing/route_set.rb:43 :in `serve`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_dispatch/journey/router.rb:43 :in `block in serve`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_dispatch/journey/router.rb:30 :in `each`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_dispatch/journey/router.rb:30 :in `serve`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_dispatch/routing/route_set.rb:817 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/rack/agent_hooks.rb:30 :in `traced_call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/rack/browser_monitoring.rb:32 :in `traced_call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/rack-1.6.4/lib/rack/etag.rb:24 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/rack-1.6.4/lib/rack/conditionalget.rb:25 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/rack-1.6.4/lib/rack/head.rb:13 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_dispatch/middleware/params_parser.rb:27 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/rack-attack-5.0.1/lib/rack/attack.rb:147 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_dispatch/middleware/flash.rb:260 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/rack-1.6.4/lib/rack/session/abstract/id.rb:225 :in `context`
[GEM_ROOT]/gems/rack-1.6.4/lib/rack/session/abstract/id.rb:220 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_dispatch/middleware/cookies.rb:560 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/query_cache.rb:36 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/activerecord-4.2.7.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:653 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_dispatch/middleware/callbacks.rb:29 :in `block in call`
[GEM_ROOT]/gems/activesupport-4.2.7.1/lib/active_support/callbacks.rb:88 :in `__run_callbacks__`
[GEM_ROOT]/gems/activesupport-4.2.7.1/lib/active_support/callbacks.rb:778 :in `_run_call_callbacks`
[GEM_ROOT]/gems/activesupport-4.2.7.1/lib/active_support/callbacks.rb:81 :in `run_callbacks`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_dispatch/middleware/callbacks.rb:27 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_dispatch/middleware/remote_ip.rb:78 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_dispatch/middleware/debug_exceptions.rb:17 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_dispatch/middleware/show_exceptions.rb:30 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/railties-4.2.7.1/lib/rails/rack/logger.rb:38 :in `call_app`
[GEM_ROOT]/gems/railties-4.2.7.1/lib/rails/rack/logger.rb:20 :in `block in call`
[GEM_ROOT]/gems/activesupport-4.2.7.1/lib/active_support/tagged_logging.rb:68 :in `block in tagged`
[GEM_ROOT]/gems/activesupport-4.2.7.1/lib/active_support/tagged_logging.rb:26 :in `tagged`
[GEM_ROOT]/gems/activesupport-4.2.7.1/lib/active_support/tagged_logging.rb:68 :in `tagged`
[GEM_ROOT]/gems/railties-4.2.7.1/lib/rails/rack/logger.rb:20 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/request_store-1.3.1/lib/request_store/middleware.rb:9 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_dispatch/middleware/request_id.rb:21 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/rack-1.6.4/lib/rack/methodoverride.rb:22 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/rack-1.6.4/lib/rack/runtime.rb:18 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/rack-timeout-0.4.2/lib/rack/timeout/core.rb:122 :in `block in call`
[GEM_ROOT]/gems/rack-timeout-0.4.2/lib/rack/timeout/support/timeout.rb:19 :in `timeout`
[GEM_ROOT]/gems/rack-timeout-0.4.2/lib/rack/timeout/core.rb:121 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/activesupport-4.2.7.1/lib/active_support/cache/strategy/local_cache_middleware.rb:28 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_dispatch/middleware/static.rb:120 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/font_assets-0.1.12/lib/font_assets/middleware.rb:29 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/rack-1.6.4/lib/rack/sendfile.rb:113 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/actionpack-4.2.7.1/lib/action_dispatch/middleware/ssl.rb:24 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/rack-utf8_sanitizer-1.3.2/lib/rack/utf8_sanitizer.rb:19 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/rack-mini-profiler-0.10.1/lib/mini_profiler/profiler.rb:171 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/railties-4.2.7.1/lib/rails/engine.rb:518 :in `call`
[GEM_ROOT]/gems/railties-4.2.7.1/lib/rails/application.rb:165 :in `call`
[GEM_ROOT]/gems/railties-4.2.7.1/lib/rails/railtie.rb:194 :in `public_send`
[GEM_ROOT]/gems/railties-4.2.7.1/lib/rails/railtie.rb:194 :in `method_missing`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/rack-1.6.4/lib/rack/static.rb:124 :in `call`
[GEM_ROOT]/gems/newrelic_rpm-3.16.2.321/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96 :in `call`
[GEM_ROOT]/gems/puma-3.6.0/lib/puma/configuration.rb:225 :in `call`
[GEM_ROOT]/gems/puma-3.6.0/lib/puma/server.rb:578 :in `handle_request`
[GEM_ROOT]/gems/puma-3.6.0/lib/puma/server.rb:415 :in `process_client`
[GEM_ROOT]/gems/puma-3.6.0/lib/puma/server.rb:275 :in `block in run`
[GEM_ROOT]/gems/puma-3.6.0/lib/puma/thread_pool.rb:116 :in `block in spawn_thread`

System configuration

Rails version: 4.2.7.1

Ruby version: 2.3.1p112

About this issue

Original URL
State: closed
Created 8 years ago
Reactions: 3
Comments: 28 (19 by maintainers)

Commits related to this issue

Eager load the association classes on boot We were expecting those classes to be loaded when an association is defined but they are not. If you add a debugger on the first line of any of those class... — committed to rails/rails by rafaelfranca 7 years ago
Eager load the association classes on boot We were expecting those classes to be loaded when an association is defined but they are not. If you add a debugger on the first line of any of those class... — committed to rails/rails by rafaelfranca 7 years ago
Eager load the association classes on boot We were expecting those classes to be loaded when an association is defined but they are not. If you add a debugger on the first line of any of those class... — committed to tgxworld/rails by rafaelfranca 7 years ago

Most upvoted comments

I’m still seeing occasional uninitialized constant errors in 5.2.1, with the following constants:

  ActiveRecord::StatementCache
  ActiveRecord::Associations::JoinDependency::JoinBase
  ActiveRecord::ConnectionAdapters::TransactionManager

For now we’ve added an initializer to force them to load:

ActiveSupport.on_load(:active_record) do
  # preload common constants to work around https://github.com/rails/rails/issues/26273
  ActiveRecord::StatementCache
  ActiveRecord::Associations::JoinDependency::JoinBase
  ActiveRecord::ConnectionAdapters::TransactionManager
end

jdelStrother on Nov 5, 2018

I think we eager load framework code that we know is going to be used to have as much framework code as possible in the master process, to be CoW-friendly. Don’t think it is related to thread-safety. At least, it shouldn’t matter if autoload works correctly. Of course, if in reality it was buggy, then eager loading would workaround that.

fxn on Jul 27, 2017

That is not what I’m seeing unfortunately. When I reproduced this error I had two threads doing the same thing and the first one finished and the second one didn’t.

rafaelfranca on Jul 27, 2017

It is because threads are also on the mix. Two threads are trying to autoload the same constant, one is succeeding, the other is not because Ruby started to loaded the constant but didn’t finish before it is being used.

rafaelfranca on Jul 27, 2017

Seeing this on my app pretty regularly (in a rake task) in production with ActiveRecord::Associations::AssociationScope::AliasTracker.

NameError: uninitialized constant ActiveRecord::Associations::AssociationScope::AliasTracker
  from lib/course_revision_updater.rb:19:in `block (2 levels) in import_new_revisions_concurrently'
  from lib/course_revision_updater.rb:26:in `import_new_revisions'
  from lib/course_revision_updater.rb:26:in `each'
  from lib/course_revision_updater.rb:27:in `block in import_new_revisions'
  from active_record/associations/collection_proxy.rb:858:in `empty?'
  from active_record/associations/has_many_association.rb:41:in `empty?'
  from active_record/associations/collection_association.rb:233:in `empty?'
  from active_record/associations/collection_association.rb:284:in `scope'
  from active_record/associations/association.rb:86:in `scope'
  from active_record/associations/association.rb:97:in `association_scope'
  from active_record/associations/association_scope.rb:5:in `scope'
  from active_record/associations/association_scope.rb:24:in `scope'

ragesoss on Jun 27, 2017

We’re seeing this in Rails 4 on Heroku, web processes.

michaeldever on Jun 27, 2017

Guys, is there a workaround for this? We also get this error all the time in production.

ankuriitk on Jun 16, 2017

We get this very occasionally in production. Only happens once if at all I think after a restart, can never reproduce, and the associated record does exist.

For us it’s uninitialized constant ActiveRecord::Associations::BelongsToAssociation. screen shot 2017-04-18 at 11 46 43

sfcgeorge on Apr 18, 2017

Still seeing this error coming up in various places, also on ActiveRecord::Associations::HasOneThroughAssociation.

mockdeep on Sep 6, 2016

@maclover7 unfortunately, I don’t think that would do much good, as we’ve only seen it once and I don’t have any way of reproducing it. We saw another constant loading error recently, but it was in the aws-sdk gem, so seems unrelated.

mockdeep on Aug 25, 2016