# HG changeset patch
# User Sylvain Thénault <sylvain.thenault@logilab.fr>
# Date 1284471181 -7200
# Node ID d992176d17b7761cedb48ce2f583936c020eaa83
# Parent  fd8fb9661c57b44d0c5e1c4334fcab4eed21ccce
[schema] ensure DISTINCT is displayed for constraint using it, this ease debugging

diff -r fd8fb9661c57 -r d992176d17b7 schema.py
--- a/schema.py	Tue Sep 14 08:49:29 2010 +0200
+++ b/schema.py	Tue Sep 14 15:33:01 2010 +0200
@@ -613,6 +613,7 @@
 class BaseRQLConstraint(BaseConstraint):
     """base class for rql constraints
     """
+    distinct_query = None
 
     def __init__(self, restriction, mainvars=None):
         self.restriction = normalize_expression(restriction)
@@ -652,8 +653,12 @@
         pass # this is a vocabulary constraint, not enforce XXX why?
 
     def __str__(self):
-        return '%s(Any %s WHERE %s)' % (self.__class__.__name__, self.mainvars,
-                                        self.restriction)
+        if self.distinct_query:
+            selop = 'Any'
+        else:
+            selop = 'DISTINCT Any'
+        return '%s(%s %s WHERE %s)' % (self.__class__.__name__, selop,
+                                       self.mainvars, self.restriction)
 
     def __repr__(self):
         return '<%s @%#x>' % (self.__str__(), id(self))