X-Git-Url: https://vcs.fsf.org/?a=blobdiff_plain;f=mediagoblin%2Fdb%2Fsql%2Fbase.py;h=838080b03f921c1ecafb812c1493ba2b8f44933c;hb=822d37176e51ce1d56c4ce8eed6948118ef8281a;hp=40140327de374b75595bac2768ac0742d8d811c0;hpb=d2fce291b535ab5f36c8cc6e4bd9648373e39ef8;p=mediagoblin.git

diff --git a/mediagoblin/db/sql/base.py b/mediagoblin/db/sql/base.py
index 40140327..838080b0 100644
--- a/mediagoblin/db/sql/base.py
+++ b/mediagoblin/db/sql/base.py
@@ -1,7 +1,45 @@
+# 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
+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)
 
-Session = scoped_session(sessionmaker())
+    def skip(self, amount):
+        return self.offset(amount)
+
+
+Session = scoped_session(sessionmaker(query_cls=GMGQuery))
 
 
 def _fix_query_dict(query_dict):
@@ -29,10 +67,39 @@ class GMGTableBase(object):
     def get(self, key):
         return getattr(self, key)
 
-    def save(self, validate = True):
+    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))