Better message for missing fields

Happens in projections, when trying to use a field that does not exist.
2016-03-31 21:28:23 +07:00 · 2016-03-31 21:28:23 +07:00 · 7661d21da2
parent 72318bb0e8
commit 7661d21da2
1 changed files with 4 additions and 1 deletions
--- a/relational/relation.py
+++ b/relational/relation.py
@ -531,7 +531,10 @@ class Header(tuple):

    def getAttributesId(self, param):
        '''Returns a list with numeric index corresponding to field's name'''
-        return [self.index(i) for i in param]
+        try:
+            return [self.index(i) for i in param]
+        except ValueError as e:
+            raise Exception('One of the fields is not in the relation: %s' % ','.join(param))

 # Backwards compatibility
 relation = Relation