diff --git a/pydal/objects.py b/pydal/objects.py
index 968888250..2bc068812 100644
--- a/pydal/objects.py
+++ b/pydal/objects.py
@@ -379,7 +379,8 @@ def fields(self):
         return self._fields
 
     def _structure(self):
-        keys = ['name','type','writable','listable','searchable','regex','options','default']        
+        keys = ['name','type','writable','listable','searchable','regex','options',
+                'default','label','unique','notnull','required']        
         def noncallable(obj): return obj if not callable(obj) else None
         return [{key: noncallable(getattr(field, key)) for key in keys} 
                 for field in self if field.readable and not field.type=='password']