el1['id'] = self.id.to_s
el1['from'] = self.node_a.to_s
el1['to'] = self.node_b.to_s
+
+ user_display_name_cache = {} if user_display_name_cache.nil?
if user_display_name_cache and user_display_name_cache[self.user_id]
# use the cache if available
else