From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Mon, 3 Apr 2006 05:22:42 +0000 (+0000)
Subject: added to_selectable() onto ColumnClause to simplify _get_col_by_original
X-Git-Tag: rel_0_1_6~30
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ea275e8d383ca0111fd4b1dc535421fe810a3dab;p=thirdparty%2Fsqlalchemy%2Fsqlalchemy.git

added to_selectable() onto ColumnClause to simplify _get_col_by_original
---

diff --git a/lib/sqlalchemy/sql.py b/lib/sqlalchemy/sql.py
index 45a95795fe..34f59fd9cc 100644
--- a/lib/sqlalchemy/sql.py
+++ b/lib/sqlalchemy/sql.py
@@ -1033,6 +1033,12 @@ class ColumnClause(ColumnElement):
     _label = property(_get_label)
     def accept_visitor(self, visitor): 
         visitor.visit_column(self)
+    def to_selectable(self, selectable):
+        """given a Selectable, returns this column's equivalent in that Selectable, if any.
+        
+        for example, this could translate the column "name" from a Table object
+        to an Alias of a Select off of that Table object."""
+        return selectable._get_col_by_original(self.original, False)
     def _get_from_objects(self):
         if self.table is not None:
             return [self.table]