# HG changeset patch
# User Julien Cristau <julien.cristau@logilab.fr>
# Date 1381322736 -7200
# Node ID 49a7392bb5b5aaffdf899c268b168a19f7c2a90f
# Parent  bae0caa8477a64a285aef1f381f1919e6e1b044a
[rset] make sure rset.description is always a list

It's more consistent, and avoids pylint warning
"Instance of 'tuple' has no 'append' member"

diff -r bae0caa8477a -r 49a7392bb5b5 rset.py
--- a/rset.py	Wed Oct 09 16:30:27 2013 +0200
+++ b/rset.py	Wed Oct 09 14:45:36 2013 +0200
@@ -45,7 +45,7 @@
     :param rql: the original RQL query string
     """
 
-    def __init__(self, results, rql, args=None, description=(), rqlst=None):
+    def __init__(self, results, rql, args=None, description=None, rqlst=None):
         self.rows = results
         self.rowcount = results and len(results) or 0
         # original query and arguments
@@ -53,7 +53,7 @@
         self.args = args
         # entity types for each cell (same shape as rows)
         # maybe discarded if specified when the query has been executed
-        self.description = description
+        self.description = description or []
         # parsed syntax tree
         if rqlst is not None:
             rqlst.schema = None # reset schema in case of pyro transfert
diff -r bae0caa8477a -r 49a7392bb5b5 server/test/unittest_querier.py
--- a/server/test/unittest_querier.py	Wed Oct 09 16:30:27 2013 +0200
+++ b/server/test/unittest_querier.py	Wed Oct 09 14:45:36 2013 +0200
@@ -702,7 +702,7 @@
         rset = self.execute('Any X WHERE X is CWGroup', build_descr=0)
         rset.rows.sort()
         self.assertEqual(tuplify(rset.rows), [(2,), (3,), (4,), (5,)])
-        self.assertEqual(rset.description, ())
+        self.assertEqual(rset.description, [])
 
     def test_select_limit_offset(self):
         rset = self.execute('CWGroup X ORDERBY N LIMIT 2 WHERE X name N')