I've been trying to order a list of newsletter objects (plone gazette) by their dateEmitted param, but I can't seem to access that value on the sort_on option.
Here's my current tal:define, with the sort_on set to Date:
tal:define="newsletters python:container.portal_catalog(portal_type='Newsletter', sort_on='Date', sort_order='normal',review_state='published');
newsletters_ord python:sequence.sort(newsletters, (('dateEmitted', 'cmp', 'asc'),));"
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