fix: add make_proxy() convenience method for data model Base

tests/db/model/test_base.py

@@ -3,12 +3,34 @@
 from unittest import TestCase
 
 try:
+    import sqlalchemy as sa
+    from sqlalchemy import orm
     from wuttjamaican.db.model import base as mod
     from wuttjamaican.db.model.auth import User
 except ImportError:
     pass
 else:
 
+
+    class MockUser(mod.Base):
+        __tablename__ = 'mock_user'
+        uuid = mod.uuid_column(sa.ForeignKey('user.uuid'), default=False)
+        user = orm.relationship(
+            User,
+            backref=orm.backref('_mock', uselist=False, cascade='all, delete-orphan'))
+        favorite_color = sa.Column(sa.String(length=100), nullable=False)
+
+
+    class TestWuttaModelBase(TestCase):
+
+        def test_make_proxy(self):
+            self.assertFalse(hasattr(User, 'favorite_color'))
+            MockUser.make_proxy(User, '_mock', 'favorite_color')
+            self.assertTrue(hasattr(User, 'favorite_color'))
+            user = User(favorite_color='green')
+            self.assertEqual(user.favorite_color, 'green')
+
+
     class TestSetting(TestCase):
 
         def test_basic(self):
@@ -17,6 +39,7 @@ else:
             setting.name = 'foo'
             self.assertEqual(str(setting), "foo")
 
+
     class TestPerson(TestCase):
 
         def test_basic(self):