From b12ea8d27a506becb46b485cb4fe73ecb20bab6a Mon Sep 17 00:00:00 2001
From: Salvo 'LtWorf' Tomaselli <tiposchi@tiscali.it>
Date: Sat, 6 Jun 2015 14:15:47 +0200
Subject: [PATCH] Raise exception for duplicated attrs in projection

Rather than ignoring them, raise an exception
---
 relational/relation.py | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/relational/relation.py b/relational/relation.py
index 3e8632f..8c9cc17 100644
--- a/relational/relation.py
+++ b/relational/relation.py
@@ -153,11 +153,8 @@ class relation (object):
             attributes = attributes[0]
 
         # Avoiding duplicated attributes
-        attributes1 = []
-        for i in attributes:
-            if i not in attributes1:
-                attributes1.append(i)
-        attributes = attributes1
+        if len(set(attributes)) != len (attributes):
+            raise Exception('Duplicated attributes in projection')
 
         ids = self.header.getAttributesId(attributes)