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# 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.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):
if '_id' in query_dict:
query_dict['id'] = query_dict.pop('_id')
class GMGTableBase(object):
query = Session.query_property()
@classmethod
def find(cls, query_dict={}):
_fix_query_dict(query_dict)
return cls.query.filter_by(**query_dict)
@classmethod
def find_one(cls, query_dict={}):
_fix_query_dict(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 save(self, validate=True):
assert validate
sess = object_session(self)
if sess is None:
sess = Session()
sess.add(self)
sess.commit()
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