10f1f2f56b
sqlalchemy supports slice() or [n:m] just fine. Right now, it seems we cannot distinguish beween "empty" results and out-of bound slices. It would be nice if we could distinguish these somehow. Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
98 lines
2.9 KiB
Python
98 lines
2.9 KiB
Python
# GNU MediaGoblin -- federated, autonomous media hosting
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# Copyright (C) 2011, 2012 MediaGoblin contributors. See AUTHORS.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from sqlalchemy.ext.declarative import declarative_base
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from sqlalchemy.orm import scoped_session, sessionmaker, object_session
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from sqlalchemy.orm.query import Query
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from sqlalchemy.sql.expression import desc
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from mediagoblin.db.sql.fake import DESCENDING
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def _get_query_model(query):
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cols = query.column_descriptions
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assert len(cols) == 1, "These functions work only on simple queries"
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return cols[0]["type"]
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class GMGQuery(Query):
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def sort(self, key, direction):
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key_col = getattr(_get_query_model(self), key)
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if direction is DESCENDING:
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key_col = desc(key_col)
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return self.order_by(key_col)
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Session = scoped_session(sessionmaker(query_cls=GMGQuery))
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class GMGTableBase(object):
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query = Session.query_property()
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@classmethod
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def find(cls, query_dict):
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return cls.query.filter_by(**query_dict)
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@classmethod
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def find_one(cls, query_dict):
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return cls.query.filter_by(**query_dict).first()
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@classmethod
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def one(cls, query_dict):
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return cls.find(query_dict).one()
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def get(self, key):
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return getattr(self, key)
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def setdefault(self, key, defaultvalue):
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# The key *has* to exist on sql.
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return getattr(self, key)
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def save(self, validate=True):
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assert validate
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sess = object_session(self)
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if sess is None:
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sess = Session()
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sess.add(self)
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sess.commit()
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def delete(self, commit=True):
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"""Delete the object and commit the change immediately by default"""
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sess = object_session(self)
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assert sess is not None, "Not going to delete detached %r" % self
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sess.delete(self)
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if commit:
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sess.commit()
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Base = declarative_base(cls=GMGTableBase)
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class DictReadAttrProxy(object):
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"""
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Maps read accesses to obj['key'] to obj.key
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and hides all the rest of the obj
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"""
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def __init__(self, proxied_obj):
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self.proxied_obj = proxied_obj
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def __getitem__(self, key):
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try:
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return getattr(self.proxied_obj, key)
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except AttributeError:
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raise KeyError("%r is not an attribute on %r"
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% (key, self.proxied_obj))
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