Towards a working XML export

histories/models.py

@@ -115,17 +115,25 @@ class History(models.Model):
         runnner.run()
         self.save()
 
-    def to_xml(self, xml_root):
+    def to_xml(self, xml_root=None):
         ''' Exports the current history to xml '''
+        standalone = False
+        if xml_root is None:
+            standalone = True
+            xml_root = ET.Element('root')
+
         hist_node = ET.Element("history", attrib={
             'start-ts': self.start_ts,
             'played': 1 if self.played else 0,
             'user': self.user.pk,
         })
         xml_root.append(hist_node)
-        for entry in self.historyentry_set:
+        for entry in self.historyentry_set.all():
             entry.to_xml(hist_node)
 
+        if standalone:
+            return xml_root
+
     @staticmethod
     def from_xml(xml_root):
         ''' Loads an history from an XML file '''