[Zope3-Users] Re: Checkout

David Johnson djohnson at jsatech.com
Mon Jan 22 05:49:38 EST 2007

Ah! Yes. I did not explain very clearly...again.    We use SQL  
because storing lots of data in sessions can be a bit slow (or at  
least that's what the doc says).  The use of containers is not to  
create new objects everytime someone checks out, but to define the  
checkout process in general.  We will be producing eCommerce sites  
and we want to give our clients the ability to create and customize  
the checkout process for their end consumers.

So we define a Checkout container that we add to the site.  Then we  
allow the client to add the steps they want to see in their checkout  
process.  When the end consumer checks out we just step through the  
each object in the Checkout container.  Each Step uses formlib to get  
checkout data.  In otherwords our Checkout container has a view which  
is a combination of all the steps.  This is one of the reasons why I  
miss the acquisition available in Zope 2.  It would be easier to do.

I may reconsider the use of SQL based upon your comments and instead  
use sessions.  It is a lot of extra coding to read and write from a  
SQL database.

On Jan 20, 2007, at 10:59 AM, Philipp von Weitershausen wrote:

> David Johnson wrote:
>> The best process I've come up with so far is the following:
>> 1. Create a Container that can contain only IStep (which I call  
>> IWizard)
>> 2. Create components that are derived from or provide IStep
>> 3. Add the components and sort them according to the order they  
>> should be displayed.
>> 4. Create a view on the container that guides the user through the  
>> steps.
> You don't need to create objects just for the sake of displaying a  
> form. Its also expensive to do this every time somebody puts  
> something in the shopping cart or goes to checkout.
> I'd keep the data in sessions; zope.formlib is flexible enough to  
> be customized where its initial data comes from (sessions) and  
> where to put it after form submittal (sessions, SAP, etc.).
> See my other reply.
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