Rails - May 2008 - Replacing ActiveRecordStore::Session with a custom model

Has anyone managed to replace ActiveRecordStore::Session with their
own model?

In the source (http://dev.rubyonrails.org/browser/trunk/actionpack/lib/
action_controller/session/active_record_store.rb)  it says you can
override the default by setting
CGI::Session::ActiveRecordStore.session_class = MySessionClass

I have tried doing this in a number of ways but I get all kinds of
weird errors, as varied as the methods I''ve tried.

Before you shoot me down for trying to do something I shouldn''t let me
explain why I want to do this.

I''d like a session model that looks something like:

class Session < ActiveRecord::Base
  has_many    :product_viewings, :dependent => :destroy
  has_many    :products, :through => :product_viewings, :limit =>
10, :include => :image

  belongs_to  :order
  belongs_to  :user
end

In my controller I would like to do something like

session.model.user = @user

and

@recently_viewed_products = session.model.products


Because I cannot replace ActiveRecordStore::Session with my session
class above I have to do instead:

session.model.user_id = @user.id

and

@recently_viewed_products
Session.find_by_session_id(session.session_id).products


I don''t think it''s unreasonable to want to treat session.model
as a
first class ActiveRecord model, anything else just seems a bit half-
baked.

Any ideas on how I could make this happen would be greatly
appreciated.

Paul Odeon


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Ok I finally nailed it...

I found that using CGI::Session::ActiveRecordStore.session_class Session worked
in production mode but not in dev, I could also make it
work in dev but only by setting config.cache_classes = true

In dev it would work on the first page load but crash with a stack too
deep error on the second and subsequent attempt.

Definitely a dependencies issue then...

All the classes are reloaded on every request, including our custom
Session class. However, CGI::Session::ActiveRecordStore.session_class
is only set on application initialization, and  the session_class
variable is left holding a stale version of the Session class. What we
need is a way to update ActiveRecordStore with a fresh Session class
after every request, the magic line of code to do that is at the end
of this post.


So to create your own session model with all the ActiveRecord goodness
follow these steps:

1. config/initializers/session.rb
CGI::Session::ActiveRecordStore.session_class = Session


2. app/models/session.rb
class Session < CGI::Session::ActiveRecordStore::Session
  has_many        :product_viewings, :dependent => :destroy
  has_many        :products, :through => :product_viewings, :limit =>
10, :include => :image
  #Or whatever ActiveRecord stuff you like
end

3. config/environment.rb
Rails::Initializer.run do |config|
  config.action_controller.session_store = :active_record_store
  config.to_prepare { CGI::Session::ActiveRecordStore.session_class Session if
ENV[''RAILS_ENV''] == ''development'' } # This
is the one
end

config.to_prepare executes the block it is passed before each request
in rails. In it, we pass the freshly reloaded  class to the Session
store but only in dev.


I hope this helps someone struggling with the same problem...

Cheers




On May 21, 12:27 pm,
"paulod...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org"
<paulod...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
wrote:
> Has anyone managed to replace ActiveRecordStore::Session with their
> own model?
>
> In the source (http://dev.rubyonrails.org/browser/trunk/actionpack/lib/
> action_controller/session/active_record_store.rb)  it says you can
> override the default by setting
> CGI::Session::ActiveRecordStore.session_class = MySessionClass
>
> I have tried doing this in a number of ways but I get all kinds of
> weird errors, as varied as the methods I''ve tried.
>
> Before you shoot me down for trying to do something I shouldn''t
let me
> explain why I want to do this.
>
> I''d like a session model that looks something like:
>
> class Session < ActiveRecord::Base
>   has_many    :product_viewings, :dependent => :destroy
>   has_many    :products, :through => :product_viewings, :limit =>
> 10, :include => :image
>
>   belongs_to  :order
>   belongs_to  :user
> end
>
> In my controller I would like to do something like
>
> session.model.user = @user
>
> and
>
> @recently_viewed_products = session.model.products
>
> Because I cannot replace ActiveRecordStore::Session with my session
> class above I have to do instead:
>
> session.model.user_id = @user.id
>
> and
>
> @recently_viewed_products >
Session.find_by_session_id(session.session_id).products
>
> I don''t think it''s unreasonable to want to treat
session.model as a
> first class ActiveRecord model, anything else just seems a bit half-
> baked.
>
> Any ideas on how I could make this happen would be greatly
> appreciated.
>
> Paul Odeon
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One small glitch with the above solution

Any of the script/* and rake scripts seem to fail with some sort of
dependency error

This is a bug (http://dev.rubyonrails.org/ticket/10520) and is
apparently fixed in 2.0.2, although that''s what I am using and I still
get the error.

As described in the link above, I put the following above the
config.to_prepare block and everything worked perfectly.

  #fixes rails bug described here: http://dev.rubyonrails.org/ticket/10520
  #this monkey patch should be removed when problem is fixed in rails
    module Rails
      class Configuration
        def to_prepare(&callback)
          after_initialize do
            require ''dispatcher'' unless defined?(::Dispatcher)
            Dispatcher.to_prepare(&callback)
          end
        end
      end
    end

On May 22, 12:18 am,
"paulod...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org"
<paulod...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
wrote:
> Ok I finally nailed it...
>
> I found that using CGI::Session::ActiveRecordStore.session_class >
Session worked in production mode but not in dev, I could also make it
> work in dev but only by setting config.cache_classes = true
>
> In dev it would work on the first page load but crash with a stack too
> deep error on the second and subsequent attempt.
>
> Definitely a dependencies issue then...
>
> All the classes are reloaded on every request, including our custom
> Session class. However, CGI::Session::ActiveRecordStore.session_class
> is only set on application initialization, and  the session_class
> variable is left holding a stale version of the Session class. What we
> need is a way to update ActiveRecordStore with a fresh Session class
> after every request, the magic line of code to do that is at the end
> of this post.
>
> So to create your own session model with all the ActiveRecord goodness
> follow these steps:
>
> 1. config/initializers/session.rb
> CGI::Session::ActiveRecordStore.session_class = Session
>
> 2. app/models/session.rb
> class Session < CGI::Session::ActiveRecordStore::Session
>   has_many        :product_viewings, :dependent => :destroy
>   has_many        :products, :through => :product_viewings, :limit =>
> 10, :include => :image
>   #Or whatever ActiveRecord stuff you like
> end
>
> 3. config/environment.rb
> Rails::Initializer.run do |config|
>   config.action_controller.session_store = :active_record_store
>   config.to_prepare { CGI::Session::ActiveRecordStore.session_class >
Session if ENV[''RAILS_ENV''] == ''development''
} # This is the one
> end
>
> config.to_prepare executes the block it is passed before each request
> in rails. In it, we pass the freshly reloaded  class to the Session
> store but only in dev.
>
> I hope this helps someone struggling with the same problem...
>
> Cheers
>
> On May 21, 12:27 pm,
"paulod...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org"
>
> <paulod...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> wrote:
> > Has anyone managed to replace ActiveRecordStore::Session with their
> > own model?
>
> > In the source
(http://dev.rubyonrails.org/browser/trunk/actionpack/lib/
> > action_controller/session/active_record_store.rb)  it says you can
> > override the default by setting
> > CGI::Session::ActiveRecordStore.session_class = MySessionClass
>
> > I have tried doing this in a number of ways but I get all kinds of
> > weird errors, as varied as the methods I''ve tried.
>
> > Before you shoot me down for trying to do something I
shouldn''t let me
> > explain why I want to do this.
>
> > I''d like a session model that looks something like:
>
> > class Session < ActiveRecord::Base
> >   has_many    :product_viewings, :dependent => :destroy
> >   has_many    :products, :through => :product_viewings, :limit
=>
> > 10, :include => :image
>
> >   belongs_to  :order
> >   belongs_to  :user
> > end
>
> > In my controller I would like to do something like
>
> > session.model.user = @user
>
> > and
>
> > @recently_viewed_products = session.model.products
>
> > Because I cannot replace ActiveRecordStore::Session with my session
> > class above I have to do instead:
>
> > session.model.user_id = @user.id
>
> > and
>
> > @recently_viewed_products > >
Session.find_by_session_id(session.session_id).products
>
> > I don''t think it''s unreasonable to want to treat
session.model as a
> > first class ActiveRecord model, anything else just seems a bit half-
> > baked.
>
> > Any ideas on how I could make this happen would be greatly
> > appreciated.
>
> > Paul Odeon
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