no _dump_data is defined for class Proc

[International]

I have the following in development.rb:

config.cache_store = :null_store

and the following in a User class:

def cached_profile
  Rails.cache.fetch("user_#{self.id}_profile") { self.profile }
end

Whenever the code reaches this point, I get the following error:

no _dump_data is defined for class Proc

The error goes away if I'm starting a memcached server and I change the cache_store. Why is this appearing on a dev environment? Shouldn't a cache miss be performed all the time if we specify that we're using a null_store?

[tenderlove]

The null store just backs the cache with a storage system that has no storage (memory, disk, or otherwise). That doesn't prevent it from attempting to encode the particular object that needs to be cached.

Can you provide a full backtrace for the exception? Also, would it be possible to provide a demo app that reproduces the problem? Thanks.

[zakwanhaj]

I got same exception, this is full backtrace:

activesupport (3.2.8) lib/active_support/cache.rb:561:in `dump'
  activesupport (3.2.8) lib/active_support/cache.rb:561:in `initialize'
  activesupport (3.2.8) lib/active_support/cache.rb:363:in `new'
  activesupport (3.2.8) lib/active_support/cache.rb:363:in `block in write'
  activesupport (3.2.8) lib/active_support/cache.rb:520:in `instrument'
  activesupport (3.2.8) lib/active_support/cache.rb:362:in `write'
  activesupport (3.2.8) lib/active_support/cache.rb:299:in `fetch'
  app/controllers/phrases_controller.rb:25:in `index'
  actionpack (3.2.8) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
  actionpack (3.2.8) lib/abstract_controller/base.rb:167:in `process_action'
  actionpack (3.2.8) lib/action_controller/metal/rendering.rb:10:in `process_action'
  actionpack (3.2.8) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
  activesupport (3.2.8) lib/active_support/callbacks.rb:480:in `_run__3329517920698679481__process_action__2526911234739366892__callbacks'
  activesupport (3.2.8) lib/active_support/callbacks.rb:405:in `__run_callback'
  activesupport (3.2.8) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
  activesupport (3.2.8) lib/active_support/callbacks.rb:81:in `run_callbacks'
  actionpack (3.2.8) lib/abstract_controller/callbacks.rb:17:in `process_action'
  actionpack (3.2.8) lib/action_controller/metal/rescue.rb:29:in `process_action'
  actionpack (3.2.8) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
  activesupport (3.2.8) lib/active_support/notifications.rb:123:in `block in instrument'
  activesupport (3.2.8) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
  activesupport (3.2.8) lib/active_support/notifications.rb:123:in `instrument'
  actionpack (3.2.8) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
  actionpack (3.2.8) lib/action_controller/metal/params_wrapper.rb:207:in `process_action'
  actionpack (3.2.8) lib/abstract_controller/base.rb:121:in `process'
  actionpack (3.2.8) lib/abstract_controller/rendering.rb:45:in `process'
  actionpack (3.2.8) lib/action_controller/metal.rb:203:in `dispatch'
  actionpack (3.2.8) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
  actionpack (3.2.8) lib/action_controller/metal.rb:246:in `block in action'
  actionpack (3.2.8) lib/action_dispatch/routing/route_set.rb:73:in `call'
  actionpack (3.2.8) lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
  actionpack (3.2.8) lib/action_dispatch/routing/route_set.rb:36:in `call'
  journey (1.0.4) lib/journey/router.rb:68:in `block in call'
  journey (1.0.4) lib/journey/router.rb:56:in `each'
  journey (1.0.4) lib/journey/router.rb:56:in `call'
  actionpack (3.2.8) lib/action_dispatch/routing/route_set.rb:600:in `call'
  omniauth (1.1.0) lib/omniauth/strategy.rb:177:in `call!'
  omniauth (1.1.0) lib/omniauth/strategy.rb:157:in `call'
  omniauth (1.1.0) lib/omniauth/strategy.rb:177:in `call!'
  omniauth (1.1.0) lib/omniauth/strategy.rb:157:in `call'
  mongoid (3.0.4) lib/rack/mongoid/middleware/identity_map.rb:33:in `block in call'
  mongoid (3.0.4) lib/mongoid/unit_of_work.rb:39:in `unit_of_work'
  mongoid (3.0.4) lib/rack/mongoid/middleware/identity_map.rb:33:in `call'
  exception_notification (2.6.1) lib/exception_notifier.rb:34:in `call'
  warden (1.1.1) lib/warden/manager.rb:35:in `block in call'
  warden (1.1.1) lib/warden/manager.rb:34:in `catch'
  warden (1.1.1) lib/warden/manager.rb:34:in `call'
  actionpack (3.2.8) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
  rack (1.4.1) lib/rack/etag.rb:23:in `call'
  rack (1.4.1) lib/rack/conditionalget.rb:25:in `call'
  actionpack (3.2.8) lib/action_dispatch/middleware/head.rb:14:in `call'
  actionpack (3.2.8) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
  actionpack (3.2.8) lib/action_dispatch/middleware/flash.rb:242:in `call'
  rack (1.4.1) lib/rack/session/abstract/id.rb:205:in `context'
  rack (1.4.1) lib/rack/session/abstract/id.rb:200:in `call'
  actionpack (3.2.8) lib/action_dispatch/middleware/cookies.rb:339:in `call'
  actionpack (3.2.8) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
  activesupport (3.2.8) lib/active_support/callbacks.rb:405:in `_run__1116681118314120984__call__2651634670845041881__callbacks'
  activesupport (3.2.8) lib/active_support/callbacks.rb:405:in `__run_callback'
  activesupport (3.2.8) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
  activesupport (3.2.8) lib/active_support/callbacks.rb:81:in `run_callbacks'
  actionpack (3.2.8) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
  actionpack (3.2.8) lib/action_dispatch/middleware/reloader.rb:65:in `call'
  actionpack (3.2.8) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
  actionpack (3.2.8) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
  actionpack (3.2.8) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
  railties (3.2.8) lib/rails/rack/logger.rb:26:in `call_app'
  railties (3.2.8) lib/rails/rack/logger.rb:16:in `call'
  config/initializers/quiet_assets.rb:7:in `call_with_quiet_assets'
  actionpack (3.2.8) lib/action_dispatch/middleware/request_id.rb:22:in `call'
  rack (1.4.1) lib/rack/methodoverride.rb:21:in `call'
  rack (1.4.1) lib/rack/runtime.rb:17:in `call'
  activesupport (3.2.8) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
  rack (1.4.1) lib/rack/lock.rb:15:in `call'
  actionpack (3.2.8) lib/action_dispatch/middleware/static.rb:62:in `call'
  railties (3.2.8) lib/rails/engine.rb:479:in `call'
  railties (3.2.8) lib/rails/application.rb:223:in `call'
  rack (1.4.1) lib/rack/content_length.rb:14:in `call'
  railties (3.2.8) lib/rails/rack/log_tailer.rb:17:in `call'
  thin (1.4.1) lib/thin/connection.rb:80:in `block in pre_process'
  thin (1.4.1) lib/thin/connection.rb:78:in `catch'
  thin (1.4.1) lib/thin/connection.rb:78:in `pre_process'
  thin (1.4.1) lib/thin/connection.rb:53:in `process'
  thin (1.4.1) lib/thin/connection.rb:38:in `receive_data'
  eventmachine (0.12.10) lib/eventmachine.rb:256:in `run_machine'
  eventmachine (0.12.10) lib/eventmachine.rb:256:in `run'
  thin (1.4.1) lib/thin/backends/base.rb:63:in `start'
  thin (1.4.1) lib/thin/server.rb:159:in `start'
  rack (1.4.1) lib/rack/handler/thin.rb:13:in `run'
  rack (1.4.1) lib/rack/server.rb:265:in `start'
  railties (3.2.8) lib/rails/commands/server.rb:70:in `start'
  railties (3.2.8) lib/rails/commands.rb:55:in `block in <top (required)>'
  railties (3.2.8) lib/rails/commands.rb:50:in `tap'
  railties (3.2.8) lib/rails/commands.rb:50:in `<top (required)>'
  script/rails:6:in `require'
  script/rails:6:in `<main>'

[ccocchi]

It's odd because it seems to fail before trying to write the entry into the backend, on Marshal.dump(value). So it should also fail with mem_cache_store.

What does your method self.profile return ? (because it seems that's where the problem comes from)

[International]

In my case, profile was just the association, defined as:

  belongs_to :profile,:polymorphic => true,:dependent => :destroy

[zakwanhaj]

it's resolved at my side. Actually it's strange solution, I just changed the following code:

translations = Rails.cache.fetch("{phrase.id}_translations") { phrase.translations }

to

translations = Rails.cache.fetch("{phrase.id}_translations") { Translation.where(:phrase_id => phrase.id) }

[carlosantoniodasilva]

@zakwanhaj I think that phrase.translations will return a proxy rather than an array of records, and that's what is being cached. You have to call all or to_a at the end to cache the resulting array, not the proxy or relation object:

translations = Rails.cache.fetch("{phrase.id}_translations") { phrase.translations.all }

I don't know if the profile problem is the same, but if it's returning the AR object, it might be.

[International]

Why is it a problem if it's returning the AR object? It's not actually a proxy, but a single object instance.

[schneems]

Can you please close, or leave steps to reproduce this in a new project?

[International]

I will try to post the minimal steps to reproduce this problem.

[senny]

Is this still an issue? If so, please put a sample app with the problem on github otherwise please close the issue.

[steveklabnik]

Yep! It's been four months, I'm gonna close unless there's a reproduction posted.

[andrewhubbs]

I am seeing a bug very similar to this using the RABL gem (which just passes through to the Rails cache). It may be worth reopening. Check out the referenced issue above for a code sample.

[brchristian]

I'm getting the same exception and have no idea what might be going on...

The line
@response = Rails.cache.fetch("remote_footer_information", :expires_in => 5.minutes) do

Is triggering the following error:

no _dump_data is defined for class Proc

Here's the stack trace:

activesupport (3.2.13) lib/active_support/cache.rb:561:in `dump'
activesupport (3.2.13) lib/active_support/cache.rb:561:in `initialize'
activesupport (3.2.13) lib/active_support/cache.rb:363:in `new'
activesupport (3.2.13) lib/active_support/cache.rb:363:in `block in write'
activesupport (3.2.13) lib/active_support/cache.rb:520:in `instrument'
activesupport (3.2.13) lib/active_support/cache.rb:362:in `write'
activesupport (3.2.13) lib/active_support/cache.rb:299:in `fetch'
lib/myappname/footer.rb:10:in `initialize'
/Users/brianchristian/.rvm/gems/ruby-1.9.3-p392@myappname/bundler/gems/spree-70457a28bcc6/core/app/views/spree/shared/_footer.html.erb:8:in `new'
/Users/brianchristian/.rvm/gems/ruby-1.9.3-p392@myappname/bundler/gems/spree-70457a28bcc6/core/app/views/spree/shared/_footer.html.erb:8:in `_cdf7b3c573d148f73a2e131dfa97ce53'
actionpack (3.2.13) lib/action_view/template.rb:145:in `block in render'
activesupport (3.2.13) lib/active_support/notifications.rb:125:in `instrument'
actionpack (3.2.13) lib/action_view/template.rb:143:in `render'
deface (0.9.1) lib/deface/action_view_extensions.rb:37:in `render'
actionpack (3.2.13) lib/action_view/renderer/partial_renderer.rb:265:in `render_partial'
actionpack (3.2.13) lib/action_view/renderer/partial_renderer.rb:238:in `block in render'
actionpack (3.2.13) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
activesupport (3.2.13) lib/active_support/notifications.rb:123:in `block in instrument'
activesupport (3.2.13) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.13) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.13) lib/action_view/renderer/abstract_renderer.rb:38:in `instrument'
actionpack (3.2.13) lib/action_view/renderer/partial_renderer.rb:237:in `render'
newrelic_rpm (3.6.2.96) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:176:in `block in render_with_newrelic'
newrelic_rpm (3.6.2.96) lib/new_relic/agent/method_tracer.rb:273:in `trace_execution_scoped'
newrelic_rpm (3.6.2.96) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:175:in `render_with_newrelic'
actionpack (3.2.13) lib/action_view/renderer/renderer.rb:41:in `render_partial'
actionpack (3.2.13) lib/action_view/renderer/renderer.rb:15:in `render'
actionpack (3.2.13) lib/action_view/helpers/rendering_helper.rb:24:in `render'
/Users/brianchristian/.rvm/gems/ruby-1.9.3-p392@myappname/bundler/gems/spree-70457a28bcc6/core/app/views/spree/layouts/spree_application.html.erb:42:in `_f73dea6c36d4628744b3dd228f801922'
actionpack (3.2.13) lib/action_view/template.rb:145:in `block in render'
activesupport (3.2.13) lib/active_support/notifications.rb:125:in `instrument'
actionpack (3.2.13) lib/action_view/template.rb:143:in `render'
deface (0.9.1) lib/deface/action_view_extensions.rb:37:in `render'
actionpack (3.2.13) lib/action_view/renderer/template_renderer.rb:59:in `render_with_layout'
actionpack (3.2.13) lib/action_view/renderer/template_renderer.rb:45:in `render_template'
actionpack (3.2.13) lib/action_view/renderer/template_renderer.rb:18:in `render'
newrelic_rpm (3.6.2.96) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:160:in `block in render_with_newrelic'
newrelic_rpm (3.6.2.96) lib/new_relic/agent/method_tracer.rb:273:in `trace_execution_scoped'
newrelic_rpm (3.6.2.96) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:159:in `render_with_newrelic'
actionpack (3.2.13) lib/action_view/renderer/renderer.rb:36:in `render_template'
actionpack (3.2.13) lib/action_view/renderer/renderer.rb:17:in `render'
actionpack (3.2.13) lib/abstract_controller/rendering.rb:110:in `_render_template'
actionpack (3.2.13) lib/action_controller/metal/streaming.rb:225:in `_render_template'
actionpack (3.2.13) lib/abstract_controller/rendering.rb:103:in `render_to_body'
actionpack (3.2.13) lib/action_controller/metal/renderers.rb:28:in `render_to_body'
actionpack (3.2.13) lib/action_controller/metal/compatibility.rb:50:in `render_to_body'
actionpack (3.2.13) lib/abstract_controller/rendering.rb:88:in `render'
actionpack (3.2.13) lib/action_controller/metal/rendering.rb:16:in `render'
actionpack (3.2.13) lib/action_controller/metal/instrumentation.rb:40:in `block (2 levels) in render'
activesupport (3.2.13) lib/active_support/core_ext/benchmark.rb:5:in `block in ms'
/Users/brianchristian/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/benchmark.rb:295:in `realtime'
activesupport (3.2.13) lib/active_support/core_ext/benchmark.rb:5:in `ms'
actionpack (3.2.13) lib/action_controller/metal/instrumentation.rb:40:in `block in render'
actionpack (3.2.13) lib/action_controller/metal/instrumentation.rb:83:in `cleanup_view_runtime'
activerecord (3.2.13) lib/active_record/railties/controller_runtime.rb:24:in `cleanup_view_runtime'
actionpack (3.2.13) lib/action_controller/metal/instrumentation.rb:39:in `render'
actionpack (3.2.13) lib/action_controller/metal/implicit_render.rb:10:in `default_render'
actionpack (3.2.13) lib/action_controller/metal/responder.rb:232:in `default_render'
actionpack (3.2.13) lib/action_controller/metal/responder.rb:160:in `to_html'
/Users/brianchristian/.rvm/gems/ruby-1.9.3-p392@myappname/bundler/gems/spree-70457a28bcc6/core/lib/spree/core/responder.rb:19:in `to_html'
actionpack (3.2.13) lib/action_controller/metal/responder.rb:153:in `respond'
actionpack (3.2.13) lib/action_controller/metal/responder.rb:146:in `call'
/Users/brianchristian/.rvm/gems/ruby-1.9.3-p392@myappname/bundler/gems/spree-70457a28bcc6/core/lib/spree/core/controller_helpers/respond_with.rb:20:in `respond_with'
app/controllers/home_controller_decorator.rb:27:in `index'
actionpack (3.2.13) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (3.2.13) lib/abstract_controller/base.rb:167:in `process_action'
actionpack (3.2.13) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (3.2.13) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
activesupport (3.2.13) lib/active_support/callbacks.rb:469:in `_run__2631897532891773803__process_action__3240282829590883043__callbacks'
activesupport (3.2.13) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.13) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
activesupport (3.2.13) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.13) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (3.2.13) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (3.2.13) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
activesupport (3.2.13) lib/active_support/notifications.rb:123:in `block in instrument'
activesupport (3.2.13) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.13) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.13) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
actionpack (3.2.13) lib/action_controller/metal/params_wrapper.rb:207:in `process_action'
activerecord (3.2.13) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
newrelic_rpm (3.6.2.96) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:38:in `block in process_action'
newrelic_rpm (3.6.2.96) lib/new_relic/agent/instrumentation/controller_instrumentation.rb:318:in `perform_action_with_newrelic_trace'
newrelic_rpm (3.6.2.96) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:37:in `process_action'
actionpack (3.2.13) lib/abstract_controller/base.rb:121:in `process'
actionpack (3.2.13) lib/abstract_controller/rendering.rb:45:in `process'
actionpack (3.2.13) lib/action_controller/metal.rb:203:in `dispatch'
actionpack (3.2.13) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
actionpack (3.2.13) lib/action_controller/metal.rb:246:in `block in action'
actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:73:in `call'
actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:36:in `call'
journey (1.0.4) lib/journey/router.rb:68:in `block in call'
journey (1.0.4) lib/journey/router.rb:56:in `each'
journey (1.0.4) lib/journey/router.rb:56:in `call'
actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:612:in `call'
/Users/brianchristian/.rvm/gems/ruby-1.9.3-p392@myappname/bundler/gems/spree-70457a28bcc6/core/lib/spree/core/middleware/redirect_legacy_product_url.rb:13:in `call'
/Users/brianchristian/.rvm/gems/ruby-1.9.3-p392@myappname/bundler/gems/spree-70457a28bcc6/core/lib/spree/core/middleware/seo_assist.rb:27:in `call'
railties (3.2.13) lib/rails/engine.rb:479:in `call'
railties (3.2.13) lib/rails/railtie/configurable.rb:30:in `method_missing'
journey (1.0.4) lib/journey/router.rb:68:in `block in call'
journey (1.0.4) lib/journey/router.rb:56:in `each'
journey (1.0.4) lib/journey/router.rb:56:in `call'
actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:612:in `call'
omniauth (1.0.3) lib/omniauth/strategy.rb:168:in `call!'
omniauth (1.0.3) lib/omniauth/strategy.rb:148:in `call'
newrelic_rpm (3.6.2.96) lib/new_relic/rack/error_collector.rb:12:in `call'
newrelic_rpm (3.6.2.96) lib/new_relic/rack/agent_hooks.rb:18:in `call'
newrelic_rpm (3.6.2.96) lib/new_relic/rack/browser_monitoring.rb:16:in `call'
warden (1.2.1) lib/warden/manager.rb:35:in `block in call'
warden (1.2.1) lib/warden/manager.rb:34:in `catch'
warden (1.2.1) lib/warden/manager.rb:34:in `call'
actionpack (3.2.13) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
rack (1.4.5) lib/rack/etag.rb:23:in `call'
rack (1.4.5) lib/rack/conditionalget.rb:25:in `call'
actionpack (3.2.13) lib/action_dispatch/middleware/head.rb:14:in `call'
actionpack (3.2.13) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.2.13) lib/action_dispatch/middleware/flash.rb:242:in `call'
rack (1.4.5) lib/rack/session/abstract/id.rb:210:in `context'
rack (1.4.5) lib/rack/session/abstract/id.rb:205:in `call'
actionpack (3.2.13) lib/action_dispatch/middleware/cookies.rb:341:in `call'
activerecord (3.2.13) lib/active_record/query_cache.rb:64:in `call'
activerecord (3.2.13) lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call'
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