# Storing object with no "marshal\_dump is defined" in session

**URL:** <https://www.ruby-forum.com/t/storing-object-with-no-marshal-dump-is-defined-in-session/100822>\
**Category:** Rails\
**Created:** [August 1, 2006, 10:53am UTC](https://www.ruby-forum.com/t/storing-object-with-no-marshal-dump-is-defined-in-session/100822 "2006-08-01T10:53:15Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![chris](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/958977/32.png) [@chris](https://www.ruby-forum.com/u/chris)\
**Post date:** [August 1, 2006, 10:53am UTC](https://www.ruby-forum.com/t/storing-object-with-no-marshal-dump-is-defined-in-session/100822/1 "2006-08-01T10:53:15Z")

</div>

One of my classes uses the class GSL::Poly. It seems from this error  
message that rails won’t let me store it in the session. ANy ideas what  
i can do?

Rendering  
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action\_controller/templates/rescues/layout.rhtml  
(500 Internal Error)  
no marshal\_dump is defined for class GSL::Poly  
/usr/local/lib/ruby/1.8/pstore.rb:348:in `dump’

Thanks  
Chris