Move SQLAlchemyModelFactory in its own module

2 files changed, 54 insertions, 0 deletions

diff --git a/factory/__init__.py b/factory/__init__.py
index 9eb3b7b..058fd76 100644
--- a/factory/__init__.py
+++ b/factory/__init__.py
@@ -39,6 +39,7 @@ from .base import (
 
 from .mogo import MogoFactory
 from .django import DjangoModelFactory
+from .alchemy import SQLAlchemyModelFactory
 
 from .declarations import (
     LazyAttribute,
diff --git a/factory/alchemy.py b/factory/alchemy.py
new file mode 100644
index 0000000..87a17fa
--- /dev/null
+++ b/factory/alchemy.py
@@ -0,0 +1,53 @@
+# -*- coding: utf-8 -*-
+# Copyright (c) 2013 Romain Commandé
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+from . import base
+
+try:
+    from sqlalchemy.sql.functions import max
+except ImportError:
+    def max():
+        raise ImportError('sqlalchemy is not found!')
+
+
+class SQLAlchemyModelFactory(base.Factory):
+    """Factory for SQLAlchemy models. """
+
+    ABSTRACT_FACTORY = True
+
+    @classmethod
+    def _setup_next_sequence(cls, *args, **kwargs):
+        """Compute the next available PK, based on the 'pk' database field."""
+        session = cls.FACTORY_SESSION
+        pk = cls.FACTORY_FOR.__table__.primary_key.columns.values()[0].key
+        max_pk = session.query(max(getattr(cls.FACTORY_FOR, pk))).one()
+        if isinstance(max_pk[0], int):
+            return max_pk[0] + 1 if max_pk[0] else 1
+        else:
+            return 1
+
+    @classmethod
+    def _create(cls, target_class, *args, **kwargs):
+        """Create an instance of the model, and save it to the database."""
+        session = cls.FACTORY_SESSION
+        obj = target_class(*args, **kwargs)
+        session.add(obj)
+        return obj