Rails - Mar 2007 - Agile Rails - How long does the Depot application hold onto the "Cart" array?

I''m walking through the wonderful "Agile Web Development for
Rails"
and in Chapter 8 on page 95 they build a Session model that has a
physical table in the database and a "Cart" array that''s
linked to the
unique Session id.
So if the session key was an integer 123 the cart array must have a
''foreign key'' value for the session_id = 123.
The session is a ''real'' database table in the MySQL database
while the
cart is an array that''s linked by it''s ''foreign
key'' named session_id.
(This is the only way I can figure that it can hold the array?)
My question is: This thing is stateless anyway...when (or does it
ever) is the Cart array DUMPED from memory?
Is it when the user logs off his browser?
Is it after a certain time defined by the program?
Is it after a certain time defined by the browser?
What mechanism eventually dumps this array?
Thank you,
David


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On Mar 7, 2007, at 12:29 PM, BraveDave wrote:
> The session is a ''real'' database table in the MySQL
database while the
> cart is an array that''s linked by it''s ''foreign
key'' named session_id.
> (This is the only way I can figure that it can hold the array?)
> My question is: This thing is stateless anyway...when (or does it
> ever) is the Cart array DUMPED from memory?
> Is it when the user logs off his browser?
> Is it after a certain time defined by the program?
> Is it after a certain time defined by the browser?
> What mechanism eventually dumps this array?
At the end of each request, all references to it disappear, and Ruby  
will eventually garbage collect it.

A new cart object is constructed for every incoming request on the  
session.


Cheers


Dave

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