From 405ecc1268038ccafc908d2617bf119cb8ef7cd2 Mon Sep 17 00:00:00 2001
From: Hanno Schlichting <hanno@hannosch.eu>
Date: Thu, 28 Jan 2010 13:44:56 +0000
Subject: [PATCH] Added an optional conversationCanonicalAdapterFactory showing
 how to share comments across all translations with LinguaPlone, by storing
 and retrieving the conversation from the canonical object.

svn path=/plone.app.discussion/trunk/; revision=33546
---
 docs/HISTORY.txt                     |  4 ++++
 plone/app/discussion/conversation.py | 21 +++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/docs/HISTORY.txt b/docs/HISTORY.txt
index 5f6ece1..5bef8cb 100644
--- a/docs/HISTORY.txt
+++ b/docs/HISTORY.txt
@@ -4,6 +4,10 @@ Changelog
 1.0b3 (XXXX-XX-XX)
 ------------------
 
+* Added an optional conversationCanonicalAdapterFactory showing how to share
+  comments across all translations with LinguaPlone, by storing and retrieving
+  the conversation from the canonical object. [hannosch]
+
 * Play by the Plone 3.3+ rules and use the INavigationRoot as a base for the moderation view. [hannosch]
 * Added a commentTitle CSS class to the comment titles. [hannosch]
 * Update message ids to match their real text. [hannosch]
diff --git a/plone/app/discussion/conversation.py b/plone/app/discussion/conversation.py
index 68f8c8d..f3bb627 100644
--- a/plone/app/discussion/conversation.py
+++ b/plone/app/discussion/conversation.py
@@ -341,6 +341,7 @@ class Conversation(Traversable, Persistent, Explicit):
         for k, v in self._comments.iteritems():
             yield (k, v.__of__(self),)
 
+
 @implementer(IConversation)
 @adapter(IAnnotatable)
 def conversationAdapterFactory(content):
@@ -356,6 +357,26 @@ def conversationAdapterFactory(content):
         conversation = annotions[ANNOTATION_KEY]
     return conversation.__of__(content)
 
+
+try:
+    from Products.LinguaPlone.interfaces import ITranslatable
+except ImportError:
+    pass
+else:
+    @implementer(IConversation)
+    @adapter(IAnnotatable)
+    def conversationCanonicalAdapterFactory(content):
+        """Adapter factory to fetch the default conversation from annotations.
+        Will create the conversation if it does not exist.
+
+        This adapter will fetch and store all comments on the canonical object,
+        so that comments will be shared across all translations.
+        """
+        if ITranslatable.providedBy(content):
+            content = content.getCanonical()
+        return conversationAdapterFactory(content)
+
+
 class ConversationReplies(object):
     """An IReplies adapter for conversations.