Index: roundup/backends/blobfiles.py
===================================================================
--- roundup/backends/blobfiles.py	(revision 4128)
+++ roundup/backends/blobfiles.py	(working copy)
@@ -15,7 +15,6 @@
 # BASIS, AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,
 # SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
 #
-#$Id: blobfiles.py,v 1.24 2008-02-07 00:57:59 richard Exp $
 '''This module exports file storage for roundup backends.
 Files are stored into a directory hierarchy.
 '''
@@ -232,6 +231,20 @@
 
         return filename + self.tempext
 
+    def _editInProgress(self, classname, nodeid, property):
+        """Return true if the file indicated is being edited.
+
+        returns -- True if the current transaction includes an edit to
+        the file indicated."""
+
+        for method, args in self.transactions:
+            if (method == self.doStoreFile and
+                args == (classname, nodeid, property)):
+                return True
+
+        return False
+    
+
     def filename(self, classname, nodeid, property=None, create=0):
         '''Determine what the filename for the given node and optionally
         property is.
@@ -252,13 +265,10 @@
 
         # If an edit to this file is in progress, then return the name
         # of the temporary file containing the edited content.
-        for method, args in self.transactions:
-            if (method == self.doStoreFile and
-                    args == (classname, nodeid, property)):
-                # There is an edit in progress for this file.
-                if not os.path.exists(tempfile):
-                    raise IOError('content file for %s not found'%tempfile)
-                return tempfile
+        if self._editInProgress(classname, nodeid, property):
+            if not os.path.exists(tempfile):
+                raise IOError('content file for %s not found'%tempfile)
+            return tempfile
 
         if os.path.exists(filename):
             return filename
@@ -310,7 +320,7 @@
         name = self._tempfile(name)
 
         # make sure we don't register the rename action more than once
-        if not os.path.exists(name):
+        if not self._editInProgress(classname, nodeid, property):
             # save off the rename action
             self.transactions.append((self.doStoreFile, (classname, nodeid,
                 property)))