Lovely snippet for inclusion: overriding a portlet

Logging this here so it isn't forgotten.

On Thu, Oct 25, 2012 at 3:06 AM, Jens W. Klein jens@bluedynamics.com wrote:

> On 2012-10-24 20:56, Tarlika Elisabeth Schmitz wrote:
> I would like to display the items in the navigation portlet in reverse
> chronological order.
>
> Any advice how to achieve this would be greatly appreciated.

Best is to override navigation trees querybuilder.

The interface of this adapter is
`plone.app.layout.navigation.interfaces.INavigationQueryBuilder`

To achieve this just subclass default querybuilder, see
https://github.com/plone/plone.app.portlets/blob/master/plone/app/portlets/portlets/navigation.py#L294
and add the methods `sortAttribute` and `sortOrder`, ie.:.

```
from plone.app.portlets.portlets.navigation import QueryBuilder

class MyQuerybuilder(QueryBuilder):

def sortAttribute(self):
return 'created'

def sortOrder(self):
return 'reversed'
```

Then create and integrate (buildout -> zcml-overrides) an `overrides.zcml`
and register your adapter to replace the default one.

hth Jens
Klein & Partner KG, member of BlueDynamics Alliance