Added some utility functions

CHANGES.rst

@@ -4,7 +4,14 @@ Changelog
 Here you can see the full list of changes between each SQLAlchemy-Utils release.
 
 
-0.12.0 (2013-05-08)
+0.12.1 (2013-05-18)
+^^^^^^^^^^^^^^^^^^^
+
+- Added utility functions remove_property and primary_keys
+
+
+
+0.12.0 (2013-05-17)
 ^^^^^^^^^^^^^^^^^^^
 
 - Added ProxyDict

setup.py

@@ -24,7 +24,7 @@ class PyTest(Command):
 
 setup(
     name='SQLAlchemy-Utils',
-    version='0.12.0',
+    version='0.12.1',
     url='https://github.com/kvesteri/sqlalchemy-utils',
     license='BSD',
     author='Konsta Vesterinen',

sqlalchemy_utils/functions.py

@@ -174,3 +174,30 @@ def escape_like(string, escape_char='*'):
         .replace('%', escape_char + '%')
         .replace('_', escape_char + '_')
     )
+
+
+def remove_property(class_, name):
+    """
+    **Experimental function**
+
+    Remove property from declarative class
+    """
+    mapper = class_.mapper
+    table = class_.__table__
+    columns = class_.mapper.c
+    column = columns[name]
+    del columns._data[name]
+    del mapper.columns[name]
+    columns._all_cols.remove(column)
+    mapper._cols_by_table[table].remove(column)
+    mapper.class_manager.uninstrument_attribute(name)
+    del mapper._props[name]
+
+
+def primary_keys(class_):
+    """
+    Returns all primary keys for given declarative class.
+    """
+    for column in class_.__table__.c:
+        if column.primary_key:
+            yield column