How to add new content on top of a folder

Here we use event handlers to push newly-created NewsItems to the top of the page. Usefull for blog-style folders. It doesn't apply when editing existing content.

Add a new subscriber to your configure.zcml (you might want to use your site-policy- or theme-product):

<subscriber 
   for="Products.ATContentTypes.interface.news.IATNewsItem
   zope.app.container.interfaces.IObjectAddedEvent"
   handler=".newsitemmover.moveToTop" />

Create the new file newsitemmover.py containing

def moveToTop(obj, event):
   """
   Moves Items to the top of its folder
   """
   folder = obj.getParentNode()
   if folder != None:
       folder.moveObjectsToTop(obj.id)

Restart Zope.

The tricky part is to choose the correct Interfaces for the subscriber. Keep in mind that IObjectAddedEvent is called several times during adding a NewsItem. It doen't matter in this case since the item can't be any more on top than on top :-)