From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Thu, 7 Jun 2007 03:02:03 +0000 (+0000)
Subject: extra test for corresponding column fix
X-Git-Tag: rel_0_3_9~88
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bf8d8436ec81a1aa5ad35b849285966753cfe629;p=thirdparty%2Fsqlalchemy%2Fsqlalchemy.git

extra test for corresponding column fix
---

diff --git a/lib/sqlalchemy/sql.py b/lib/sqlalchemy/sql.py
index 3a8a27d67e..41b61d4afb 100644
--- a/lib/sqlalchemy/sql.py
+++ b/lib/sqlalchemy/sql.py
@@ -1734,6 +1734,8 @@ class FromClause(Selectable):
         for co in self._adjusted_exportable_columns():
             cp = self._proxy_column(co)
             for ci in cp.orig_set:
+                # note that some ambiguity is raised here, whereby a selectable might have more than 
+                # one column that maps to an "original" column.  examples include unions and joins
                 self._orig_cols[ci] = cp
         if self.oid_column is not None:
             for ci in self.oid_column.orig_set:
diff --git a/test/sql/selectable.py b/test/sql/selectable.py
index 221d8430c4..57ad998860 100755
--- a/test/sql/selectable.py
+++ b/test/sql/selectable.py
@@ -27,6 +27,11 @@ table2 = Table('table2', db,
 )
 
 class SelectableTest(testbase.AssertMixin):
+    def testjoinagainstself(self):
+        jj = select([table.c.col1.label('bar_col1')])
+        jjj = join(table, jj, table.c.col1==jj.c.bar_col1)
+        assert jjj.corresponding_column(jjj.c.table1_col1) is jjj.c.table1_col1
+
     def testjoinagainstjoin(self):
         j  = outerjoin(table, table2, table.c.col1==table2.c.col2)
         jj = select([ table.c.col1.label('bar_col1')],from_obj=[j]).alias('foo')