| 1 | # GNU MediaGoblin -- federated, autonomous media hosting |
| 2 | # Copyright (C) 2011, 2012 MediaGoblin contributors. See AUTHORS. |
| 3 | # |
| 4 | # This program is free software: you can redistribute it and/or modify |
| 5 | # it under the terms of the GNU Affero General Public License as published by |
| 6 | # the Free Software Foundation, either version 3 of the License, or |
| 7 | # (at your option) any later version. |
| 8 | # |
| 9 | # This program is distributed in the hope that it will be useful, |
| 10 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | # GNU Affero General Public License for more details. |
| 13 | # |
| 14 | # You should have received a copy of the GNU Affero General Public License |
| 15 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | |
| 17 | |
| 18 | from sqlalchemy.ext.declarative import declarative_base |
| 19 | from sqlalchemy.orm import scoped_session, sessionmaker, object_session |
| 20 | |
| 21 | Session = scoped_session(sessionmaker()) |
| 22 | |
| 23 | |
| 24 | class GMGTableBase(object): |
| 25 | query = Session.query_property() |
| 26 | |
| 27 | def get(self, key): |
| 28 | return getattr(self, key) |
| 29 | |
| 30 | def setdefault(self, key, defaultvalue): |
| 31 | # The key *has* to exist on sql. |
| 32 | return getattr(self, key) |
| 33 | |
| 34 | def save(self): |
| 35 | sess = object_session(self) |
| 36 | if sess is None: |
| 37 | sess = Session() |
| 38 | sess.add(self) |
| 39 | sess.commit() |
| 40 | |
| 41 | def delete(self, commit=True): |
| 42 | """Delete the object and commit the change immediately by default""" |
| 43 | sess = object_session(self) |
| 44 | assert sess is not None, "Not going to delete detached %r" % self |
| 45 | sess.delete(self) |
| 46 | if commit: |
| 47 | sess.commit() |
| 48 | |
| 49 | |
| 50 | Base = declarative_base(cls=GMGTableBase) |
| 51 | |
| 52 | |
| 53 | class DictReadAttrProxy(object): |
| 54 | """ |
| 55 | Maps read accesses to obj['key'] to obj.key |
| 56 | and hides all the rest of the obj |
| 57 | """ |
| 58 | def __init__(self, proxied_obj): |
| 59 | self.proxied_obj = proxied_obj |
| 60 | |
| 61 | def __getitem__(self, key): |
| 62 | try: |
| 63 | return getattr(self.proxied_obj, key) |
| 64 | except AttributeError: |
| 65 | raise KeyError("%r is not an attribute on %r" |
| 66 | % (key, self.proxied_obj)) |