Mv db.sql.base to db.base

This concludes the db.sql.* -> db.* move. Our db abstraction layer is
sqlalchemy, so there is no need to a separate db.sql.* hierarchy.

All tests have been run for each of the commit series to make sure
everything works at every step.

1 files changed, 91 insertions, 0 deletions

diff --git a/mediagoblin/db/base.py b/mediagoblin/db/base.py
new file mode 100644
index 00000000..3530011e
--- /dev/null
+++ b/mediagoblin/db/base.py
@@ -0,0 +1,91 @@
+# GNU MediaGoblin -- federated, autonomous media hosting
+# Copyright (C) 2011, 2012 MediaGoblin contributors.  See AUTHORS.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import scoped_session, sessionmaker, object_session
+from sqlalchemy.orm.query import Query
+
+def _get_query_model(query):
+    cols = query.column_descriptions
+    assert len(cols) == 1, "These functions work only on simple queries"
+    return cols[0]["type"]
+
+
+class GMGQuery(Query):
+    def sort(self, key):
+        key_col = getattr(_get_query_model(self), key)
+        return self.order_by(key_col)
+
+
+Session = scoped_session(sessionmaker(query_cls=GMGQuery))
+
+
+class GMGTableBase(object):
+    query = Session.query_property()
+
+    @classmethod
+    def find(cls, query_dict):
+        return cls.query.filter_by(**query_dict)
+
+    @classmethod
+    def find_one(cls, query_dict):
+        return cls.query.filter_by(**query_dict).first()
+
+    @classmethod
+    def one(cls, query_dict):
+        return cls.find(query_dict).one()
+
+    def get(self, key):
+        return getattr(self, key)
+
+    def setdefault(self, key, defaultvalue):
+        # The key *has* to exist on sql.
+        return getattr(self, key)
+
+    def save(self):
+        sess = object_session(self)
+        if sess is None:
+            sess = Session()
+        sess.add(self)
+        sess.commit()
+
+    def delete(self, commit=True):
+        """Delete the object and commit the change immediately by default"""
+        sess = object_session(self)
+        assert sess is not None, "Not going to delete detached %r" % self
+        sess.delete(self)
+        if commit:
+            sess.commit()
+
+
+Base = declarative_base(cls=GMGTableBase)
+
+
+class DictReadAttrProxy(object):
+    """
+    Maps read accesses to obj['key'] to obj.key
+    and hides all the rest of the obj
+    """
+    def __init__(self, proxied_obj):
+        self.proxied_obj = proxied_obj
+
+    def __getitem__(self, key):
+        try:
+            return getattr(self.proxied_obj, key)
+        except AttributeError:
+            raise KeyError("%r is not an attribute on %r"
+                % (key, self.proxied_obj))