From: Sebastian Bank <sebastian.bank@uni-leipzig.de>
Date: Fri, 19 Jun 2015 15:37:21 +0000 (+0200)
Subject: add ClauseElement.cast() shortcut-method
X-Git-Tag: rel_1_0_7~2^2
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=84e813aee4b47edb5220bc76083525d1ac4e45ba;p=thirdparty%2Fsqlalchemy%2Fsqlalchemy.git

add ClauseElement.cast() shortcut-method
---

diff --git a/lib/sqlalchemy/sql/elements.py b/lib/sqlalchemy/sql/elements.py
index 27ecce2b0b..5df736ac7c 100644
--- a/lib/sqlalchemy/sql/elements.py
+++ b/lib/sqlalchemy/sql/elements.py
@@ -837,6 +837,13 @@ class ColumnElement(operators.ColumnOperators, ClauseElement):
         else:
             return False
 
+    def cast(self, type_):
+        """Produce a type cast, i.e. ``CAST(<expression> AS <type>)``.
+
+        This is a shortcut to the :func:`.cast` function.
+        """
+        return Cast(self, type_)
+
     def label(self, name):
         """Produce a column label, i.e. ``<columnname> AS <name>``.
 
diff --git a/test/sql/test_type_expressions.py b/test/sql/test_type_expressions.py
index 574edfe9e8..c35e9ff538 100644
--- a/test/sql/test_type_expressions.py
+++ b/test/sql/test_type_expressions.py
@@ -40,6 +40,13 @@ class SelectTest(_ExprFixture, fixtures.TestBase, AssertsCompiledSQL):
             "SELECT CAST(test_table.y AS VARCHAR) AS anon_1 FROM test_table"
         )
 
+    def test_cast_method(self):
+        table = self._fixture()
+        self.assert_compile(
+            select([table.c.y.cast(String)]),
+            "SELECT CAST(test_table.y AS VARCHAR) AS anon_1 FROM test_table"
+        )
+
     def test_select_cols_use_labels(self):
         table = self._fixture()