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Howto override the enable_conversation method.
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plone.app.discussion way to decide if commenting is enabled on a content
object can be quite complex and cumbersome due to the need to be backward
compatible with the way the old commenting system in Plone (<4.1) worked.
The comments viewlet calls the enabled method of the ConversationView to
decide if the add comment form should show up:
.. literalinclude:: ../../../plone/app/discussion/browser/conversation.py
:language: python
:pyobject: ConversationView
If you want to override this behavior, you just have to create your own enabled method. To do so, we first have to register our custom
ConversationView by overriding the existing one in our configure.zcml::
<configure
xmlns="http://namespaces.zope.org/zope"
xmlns:browser="http://namespaces.zope.org/browser"
i18n_domain="mycustompackage.discussion">
<!-- Override plone.app.discussion's conversation view -->
<browser:page
name="conversation_view"
for="plone.dexterity.interfaces.IDexterityContent"
class=".conversation.ConversationView"
permission="zope2.View"
/>
</configure>
Now we implement the conversation view with a single "enable" method in
conversation.py::
from zope.component import queryUtility
from plone.registry.interfaces import IRegistry
from Acquisition import aq_inner
from Products.CMFCore.utils import getToolByName
from plone.app.discussion.interfaces import IDiscussionSettings
class ConversationView(object):
def enabled(self):
context = aq_inner(self.context)
# Fetch discussion registry
registry = queryUtility(IRegistry)
settings = registry.forInterface(IDiscussionSettings, check=False)
# Check if discussion is allowed globally
if not settings.globally_enabled:
return False
# Check if discussion is allowed on the content object
if context.allow_discussion is not None:
return context.allow_discussion
# Check if discussion is allowed on the content type
portal_types = getToolByName(self, 'portal_types')
document_fti = getattr(portal_types, context.portal_type)
return document_fti.getProperty('allow_discussion')