How to store ActiveRecord object in session using Rails?

Question

I'm building an Shopping Cart for my site and I having one trouble with rails session and ActiveRecord Objects:

Shopping Cart is actually one Order object with some OrderItems.

After add Order object to session, Dalli started raise this exception:

Marshalling error for key 'sessions:9e67886e826819a3213df4f4c89db6e0': can't dump hash with default proc
You are trying to cache a Ruby object which cannot be serialized to memcached.
/home/rodrigo/.rvm/gems/ruby-1.9.3-p125@netsabe-ecommerce/gems/dalli-2.1.0/lib/dalli/server.rb:277:in `dump'
    /home/rodrigo/.rvm/gems/ruby-1.9.3-p125@netsabe-ecommerce/gems/dalli-2.1.0/lib/dalli/server.rb:277:in `serialize'
    /home/rodrigo/.rvm/gems/ruby-1.9.3-p125@netsabe-ecommerce/gems/dalli-2.1.0/lib/dalli/server.rb:164:in `set'
    /home/rodrigo/.rvm/gems/ruby-1.9.3-p125@netsabe-ecommerce/gems/dalli-2.1.0/lib/dalli/server.rb:48:in `request'
    /home/rodrigo/.rvm/gems/ruby-1.9.3-p125@netsabe-ecommerce/gems/dalli-2.1.0/lib/dalli/options.rb:18:in `block in request'
    /home/rodrigo/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
    /home/rodrigo/.rvm/gems/ruby-1.9.3-p125@netsabe-ecommerce/gems/dalli-2.1.0/lib/dalli/options.rb:17:in `request'
    /home/rodrigo/.rvm/gems/ruby-1.9.3-p125@netsabe-ecommerce/gems/dalli-2.1.0/lib/dalli/client.rb:251:in `perform'
    /home/rodrigo/.rvm/gems/ruby-1.9.3-p125@netsabe-ecommerce/gems/dalli-2.1.0/lib/dalli/client.rb:120:in `set'
    /home/rodrigo/.rvm/gems/ruby-1.9.3-p125@netsabe-ecommerce/gems/dalli-2.1.0/lib/action_dispatch/middleware/session/dalli_store.rb:50:in `set_session'

Googling, I found that ActiveRecord can not be stored on session.

So, how is the best way to store this objects on session? I will have to implement serialize/deserialize methods for these classes?

Thank you!

EDIT 1:

Remembering that Order object isn't persisted yet!

Community · Accepted Answer · 2017-05-23 12:14:16Z

7

Storing objects in the session is a bad idea.
Storing Objects in a Session in Rails
Better to store the id of the object so you can always check if the object in on the latest state.

edited May 23, 2017 at 12:14

CommunityBot

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answered Sep 21, 2012 at 17:34

MurifoX

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3 Comments

Rodrigo Over a year ago

Ok, but Order object is not persisted on database yet.

mu is too short Over a year ago

@Rodrigo: It doesn't have to be persisted, you'll get a default proc pretty much as soon as you think about an AR object: stackoverflow.com/a/6392704/479863

Muflix Over a year ago

but that will always run the database query.. if i store object to session i will save that queries .. ?!

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