Rails - Jul 2012 - uninitialized constant ActionController::Flash::FlashHash [NameError])

My application, a very simple general ledger, that worked very well until 
June 26 does not work any longer. It is used under Ubuntu 12.04 and I 
believe there was a Ruby update after that.

What happens?

When I try to start the appIication I get the following output in my web 
browser:

ActionDispatch::Session::SessionRestoreError 

Session contains objects whose class definition isn''t available.
Remember to require the classes for all objects kept in the session.
(Original exception: uninitialized constant ActionController::Flash::FlashHash
[NameError])

The environment is  
Rails 3.2.1
=> Booting WEBrick
=> Rails 3.2.1 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
[2012-07-23 22:24:03] INFO  WEBrick 1.3.1
[2012-07-23 22:24:03] INFO  ruby 1.9.3 (2011-10-30) [i686-linux]
and the console contains
Started GET "/" for 127.0.0.1 at 2012-07-23 22:24:07 +0200

ActionDispatch::Session::SessionRestoreError (Session contains objects whose
class definition isn''t available.
Remember to require the classes for all objects kept in the session.
(Original exception: uninitialized constant ActionController::Flash::FlashHash
[NameError])
):
  actionpack (3.2.1)
lib/action_dispatch/middleware/session/abstract_store.rb:62:in `rescue in rescue
in stale_session_check!''
  actionpack (3.2.1)
lib/action_dispatch/middleware/session/abstract_store.rb:58:in `rescue in
stale_session_check!''
  actionpack (3.2.1)
lib/action_dispatch/middleware/session/abstract_store.rb:55:in
`stale_session_check!''
  actionpack (3.2.1)
lib/action_dispatch/middleware/session/cookie_store.rb:51:in
`unpacked_cookie_data''
  rack (1.4.1) lib/rack/session/cookie.rb:98:in `extract_session_id''
  actionpack (3.2.1)
lib/action_dispatch/middleware/session/abstract_store.rb:51:in `block in
extract_session_id''
  actionpack (3.2.1)
lib/action_dispatch/middleware/session/abstract_store.rb:55:in
`stale_session_check!''
  actionpack (3.2.1)
lib/action_dispatch/middleware/session/abstract_store.rb:51:in
`extract_session_id''
  rack (1.4.1) lib/rack/session/abstract/id.rb:43:in `load_session_id!''
  rack (1.4.1) lib/rack/session/abstract/id.rb:32:in `[]''
  rack (1.4.1) lib/rack/session/abstract/id.rb:262:in
`current_session_id''
  rack (1.4.1) lib/rack/session/abstract/id.rb:268:in `session_exists?''
  rack (1.4.1) lib/rack/session/abstract/id.rb:107:in `exists?''
  rack (1.4.1) lib/rack/session/abstract/id.rb:122:in `load_for_read!''
  rack (1.4.1) lib/rack/session/abstract/id.rb:64:in `has_key?''
  actionpack (3.2.1) lib/action_dispatch/middleware/flash.rb:258:in `ensure in
call''
  actionpack (3.2.1) lib/action_dispatch/middleware/flash.rb:259: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 (3.2.1) lib/action_dispatch/middleware/cookies.rb:338:in
`call''
  activerecord (3.2.1) lib/active_record/query_cache.rb:64:in `call''
  activerecord (3.2.1)
lib/active_record/connection_adapters/abstract/connection_pool.rb:443:in
`call''
  actionpack (3.2.1) lib/action_dispatch/middleware/callbacks.rb:28:in `block in
call''
  activesupport (3.2.1) lib/active_support/callbacks.rb:405:in
`_run__967158296__call__1011983202__callbacks''
  activesupport (3.2.1) lib/active_support/callbacks.rb:405:in
`__run_callback''
  activesupport (3.2.1) lib/active_support/callbacks.rb:385:in
`_run_call_callbacks''
  activesupport (3.2.1) lib/active_support/callbacks.rb:81:in
`run_callbacks''
  actionpack (3.2.1) lib/action_dispatch/middleware/callbacks.rb:27:in
`call''
  actionpack (3.2.1) lib/action_dispatch/middleware/reloader.rb:65:in
`call''
  actionpack (3.2.1) lib/action_dispatch/middleware/remote_ip.rb:31:in
`call''
  actionpack (3.2.1) lib/action_dispatch/middleware/debug_exceptions.rb:16:in
`call''
  actionpack (3.2.1) lib/action_dispatch/middleware/show_exceptions.rb:56:in
`call''
  railties (3.2.1) lib/rails/rack/logger.rb:26:in `call_app''
  railties (3.2.1) lib/rails/rack/logger.rb:16:in `call''
  actionpack (3.2.1) 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 (3.2.1) lib/active_support/cache/strategy/local_cache.rb:72:in
`call''
  rack (1.4.1) lib/rack/lock.rb:15:in `call''
  actionpack (3.2.1) lib/action_dispatch/middleware/static.rb:53:in
`call''
  railties (3.2.1) lib/rails/engine.rb:479:in `call''
  railties (3.2.1) lib/rails/application.rb:220:in `call''
  rack (1.4.1) lib/rack/content_length.rb:14:in `call''
  railties (3.2.1) lib/rails/rack/log_tailer.rb:14:in `call''
  rack (1.4.1) lib/rack/handler/webrick.rb:59:in `service''
 
/home/tpollak/.rbenv/versions/1.9.3-p0/lib/ruby/1.9.1/webrick/httpserver.rb:138:in
`service''
 
/home/tpollak/.rbenv/versions/1.9.3-p0/lib/ruby/1.9.1/webrick/httpserver.rb:94:in
`run''
  /home/tpollak/.rbenv/versions/1.9.3-p0/lib/ruby/1.9.1/webrick/server.rb:191:in
`block in start_thread''


  Rendered
/home/tpollak/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/actionpack-3.2.1/lib/action_dispatch/middleware/templates/rescues/_trace.erb
(1.5ms)
  Rendered
/home/tpollak/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/actionpack-3.2.1/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb
(1.6ms)
  Rendered
/home/tpollak/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/actionpack-3.2.1/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb
within rescues/layout (5.4ms)
I have installed RubyGems 1.8.24 and use rbenv to control versions.

How do I avoid the crash?

 

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On 23 July 2012 21:43, Tommy Pollák
<kassor-hQAhlroVPTjped5Vm0LI4NXl3P/j4wiQ@public.gmane.org>
wrote:
> My application, a very simple general ledger, that worked very well until
> June 26 does not work any longer. It is used under Ubuntu 12.04 and I
> believe there was a Ruby update after that.
>
> What happens?
>
> When I try to start the appIication I get the following output in my web
> browser:
>
> ActionDispatch::Session::SessionRestoreError
>
> Session contains objects whose class definition isn''t available.
> Remember to require the classes for all objects kept in the session.
> (Original exception: uninitialized constant
> ActionController::Flash::FlashHash [NameError])
Have you tried clearing the cookies in your browser?  Or try it with a
different browser or from a different machine.

Colin

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On Monday, July 23, 2012 9:43:49 PM UTC+1, Tommy Pollák wrote:


The clue is this


ActionDispatch::Session::SessionRestoreError 
Session contains objects whose class definition isn''t available.
Remember
to require the classes for all objects kept in the session.
(Original exception: uninitialized constant 
ActionController::Flash::FlashHash [NameError])


The session contains serialised ruby objects and in this instance contains 
an object that rails couldn''t deserialize. If my memory is correct, 
ActionController::Flash::FlashHash was the name of the class that held the 
session values in older versions of rails - it looks like you might have 
accidentally upgraded rails. Clearing out sessions should fix this, 
although the upgrade might of course cause problems elsewhere.

Fred

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Thanks! Works perfectly!

Den onsdagen den 25:e juli 2012 kl. 09:19:02 UTC+2 skrev Colin
Law:
>
> On 23 July 2012 21:43, Tommy Pollák
<kassor-hQAhlroVPTjped5Vm0LI4NXl3P/j4wiQ@public.gmane.org> wrote:
> > My application, a very simple general ledger, that worked very well 
> until 
> > June 26 does not work any longer. It is used under Ubuntu 12.04 and I 
> > believe there was a Ruby update after that. 
> > 
> > What happens? 
> > 
> > When I try to start the appIication I get the following output in my
web
> > browser: 
> > 
> > ActionDispatch::Session::SessionRestoreError 
> > 
> > Session contains objects whose class definition isn''t
available.
> > Remember to require the classes for all objects kept in the session. 
> > (Original exception: uninitialized constant 
> > ActionController::Flash::FlashHash [NameError]) 
>
> Have you tried clearing the cookies in your browser?  Or try it with a 
> different browser or from a different machine. 
>
> Colin 
>
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Thanks!
Seems your description is relevant, see answer to previous advice.

Den onsdagen den 25:e juli 2012 kl. 11:22:14 UTC+2 skrev Frederick
Cheung:
>
>
> On Monday, July 23, 2012 9:43:49 PM UTC+1, Tommy Pollák wrote:
>
>
> The clue is this
>
>
> ActionDispatch::Session::SessionRestoreError 
> Session contains objects whose class definition isn''t available.
Remember
> to require the classes for all objects kept in the session.
> (Original exception: uninitialized constant 
> ActionController::Flash::FlashHash [NameError])
>
>
> The session contains serialised ruby objects and in this instance contains 
> an object that rails couldn''t deserialize. If my memory is
correct,
> ActionController::Flash::FlashHash was the name of the class that held the 
> session values in older versions of rails - it looks like you might have 
> accidentally upgraded rails. Clearing out sessions should fix this, 
> although the upgrade might of course cause problems elsewhere.
>
> Fred
>
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