-from sqlalchemy.orm import scoped_session, sessionmaker
+# 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/>.
-Session = scoped_session(sessionmaker())
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import scoped_session, sessionmaker, object_session
+from sqlalchemy.orm.query import Query
+from sqlalchemy.sql.expression import desc
+from mediagoblin.db.sql.fake import DESCENDING
+
+
+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, direction):
+ key_col = getattr(_get_query_model(self), key)
+ if direction is DESCENDING:
+ key_col = desc(key_col)
+ return self.order_by(key_col)
+
+ def skip(self, amount):
+ return self.offset(amount)
+
+
+Session = scoped_session(sessionmaker(query_cls=GMGQuery))
def _fix_query_dict(query_dict):
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, validate=True):
+ assert validate
+ sess = object_session(self)
+ if sess is None:
+ sess = Session()
+ sess.add(self)
+ sess.commit()
+
+ def delete(self):
+ sess = object_session(self)
+ assert sess is not None, "Not going to delete detached %r" % self
+ sess.delete(self)
+ 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))