CMFACtivity: Add invalid_only parameter

Thanks to using invalid_only the caller can check if there is any
invalid activity on the context.

This might be used by hasErrorActivity in ActiveObject and
ActiveProcess.

product/CMFActivity/Activity/SQLBase.py

@@ -210,7 +210,8 @@ class SQLBase(Queue):
     return result[0].uid_count
 
   def hasActivity(self, activity_tool, object, method_id=None, only_valid=None,
-                  active_process_uid=None):
+                  active_process_uid=None,
+                  only_invalid=False):
     hasMessage = getattr(activity_tool, 'SQLBase_hasMessage', None)
     if hasMessage is not None:
       if object is None:
@@ -219,7 +220,8 @@ class SQLBase(Queue):
         path = '/'.join(object.getPhysicalPath())
       try:
         result = hasMessage(table=self.sql_table, path=path, method_id=method_id,
-          only_valid=only_valid, active_process_uid=active_process_uid)
+          only_valid=only_valid, active_process_uid=active_process_uid,
+          only_invalid=only_invalid)
       except DatabaseError:
         LOG(
           'SQLBase',

product/CMFActivity/skins/activity/SQLBase_hasMessage.zsql

@@ -11,11 +11,13 @@ class_file:
 path
 method_id
 active_process_uid
-only_valid</params>
+only_valid
+only_invalid</params>
 SELECT count(path) as message_count FROM
   <dtml-var table>
 WHERE 1 = 1
 <dtml-if expr="path is not None">AND path = <dtml-sqlvar path type="string"> </dtml-if>
 <dtml-if expr="method_id is not None">AND method_id = <dtml-sqlvar method_id type="string"></dtml-if>
 <dtml-if expr="only_valid">AND processing_node > -2</dtml-if>
+<dtml-if expr="only_invalid">AND processing_node < -1</dtml-if>
 <dtml-if expr="active_process_uid is not None"> AND active_process_uid = <dtml-sqlvar active_process_uid type="int"> </dtml-if>