Added sort by aliased and joined entity

CHANGES.rst

@@ -4,6 +4,12 @@ Changelog
 Here you can see the full list of changes between each SQLAlchemy-Utils release.
 
 
+0.8.4 (2013-04-08)
+^^^^^^^^^^^^^^^^^^
+
+- Added sort by aliased and joined entity
+
+
 0.8.3 (2013-04-03)
 ^^^^^^^^^^^^^^^^^^
 

setup.py

@@ -24,7 +24,7 @@ class PyTest(Command):
 
 setup(
     name='SQLAlchemy-Utils',
-    version='0.8.3',
+    version='0.8.4',
     url='https://github.com/kvesteri/sqlalchemy-utils',
     license='BSD',
     author='Konsta Vesterinen',

sqlalchemy_utils/functions.py

@@ -2,6 +2,7 @@ from sqlalchemy.orm import defer
 from sqlalchemy.orm.mapper import Mapper
 from sqlalchemy.orm.query import _ColumnEntity
 from sqlalchemy.orm.properties import ColumnProperty
+from sqlalchemy.orm.util import AliasedInsp
 from sqlalchemy.sql.expression import desc, asc
 
 
@@ -107,6 +108,16 @@ def sort_query(query, sort):
         return query.order_by(func(sort))
 
     for entity in entities:
+        if isinstance(entity, AliasedInsp):
+            if component and entity.name != component:
+                continue
+
+            selectable = entity.selectable
+
+            if sort in selectable.c:
+                attr = selectable.c[sort]
+                query = query.order_by(func(attr))
+        else:
             table = entity.__table__
             if component and table.name != component:
                 continue

sqlalchemy_utils/types.py

@@ -130,7 +130,7 @@ class NumberRangeType(types.TypeDecorator):
     impl = NumberRangeRawType
 
     def process_bind_param(self, value, dialect):
-        if value:
+        if value is not None:
             return value.normalized
         return value
 

tests/test_utility_functions.py

@@ -64,6 +64,16 @@ class TestSortQuery(TestCase):
         query = sort_query(query, '-articles')
         assert 'ORDER BY articles DESC' in str(query)
 
+    def test_sort_by_aliased_joined_entity(self):
+        alias = sa.orm.aliased(self.Category, name='categories')
+        query = self.session.query(
+            self.Article
+        ).join(
+            alias, self.Article.category
+        )
+        query = sort_query(query, '-categories-name')
+        assert 'ORDER BY categories.name DESC' in str(query)
+
     def test_sort_by_joined_table_column(self):
         query = self.session.query(self.Article).join(self.Article.category)
         sorted_query = sort_query(query, 'category-name')