Make sur we do not chain a portal type to the same workflow twice

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@5496 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/BusinessTemplate.py

@@ -1177,7 +1177,14 @@ class PortalTypeWorkflowChainTemplateItem(BaseTemplateItem):
           old_chain_dict = chain_dict['chain_%s' % portal_type]
           # XXX we don't use the chain (Default) in erp5 so don't keep it
           if old_chain_dict != '(Default)' and old_chain_dict != '':
-            chain_dict['chain_%s' % portal_type] = old_chain_dict +', '+self._objects[path]
+            # unique workflow chains
+            old_chain_workflow_id_set = {}
+            for wf_id in old_chain_dict.split(', '):
+              old_chain_workflow_id_set[wf_id] = 1
+            for wf_id in self._objects[path].split(', '):
+              old_chain_workflow_id_set[wf_id] = 1
+            chain_dict['chain_%s' % portal_type] = ', '.join(
+                                              old_chain_workflow_id_set.keys())
           else:
             chain_dict['chain_%s' % portal_type] = self._objects[path]
         else: