Extend Default Content Types

Plone Support Add-on Development
3

Most of the fields of Plone default content types come from behaviors. To modify them you can make your product to override some properties.

Under the profiles/default/types add the Type.xml with the properties you want to override.

A quick example of how to make News Item folderish:

interfaces.py

# -*- coding: utf-8 -*-
from plone.app.contenttypes.interfaces import INewsItem as INewsItemOriginal

class INewsItem(INewsItemOriginal):
    """ Folderish News """

Note I subclass News Item Interface to have available the views registered to the original interface

contents.py

# -*- coding: utf-8 -*-
from plone.dexterity.content import Container
from zope.interface import implementer
from .interfaces import INewsItem

@implementer(INewsItem)
class NewsItem(Container):
    """Convenience subclass for ``News Item`` portal type
    """

profiles/default/type/News_Item.xml

<?xml version="1.0"?>
<object
    i18n:domain="plone"
    meta_type="Dexterity FTI"
    name="News Item"
    xmlns:i18n="http://xml.zope.org/namespaces/i18n">
    <!-- Hierarchy control -->
    <property name="filter_content_types">False</property>
    <property name="klass">my.product.contents.NewsItem</property>
    <property name="schema">my.product.interfaces.INewsItem</property>
</object>
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