[entity] ensure the .related(entities=False) parameter is honored all the way down (closes #2755994)
As of today, such a call will always fill the relation cache by
calling .entities() on every single related rset entry.
As a consequence, the `limit` parameter handling also had to be fixed.
It was bogus in the following ways:
* not used in the related_rql, hence potentially huge database
requests, but also actually
* foolishly used in the .entities()-calling cache routine we now
bypass (this changeset ticket's main topic)
Now:
* we set a limit on the rql expression, and
* forbid caching if given a non-None limit (as we don't want to make
the cache handling code more complicated than it is already)
With this, entity.unrelated gets a better limit implementation (so the
code in related/unrelated is nice and symmetric)
Risk:
* _cw_relation_cache disappears completely, which is good, but this is
Python, so you never know ...
# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of CubicWeb.
#
# CubicWeb is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# CubicWeb 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 Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with CubicWeb. If not, see <http://www.gnu.org/licenses/>.
"""unit tests for module cubicweb.server.sqlutils
"""
import sys
from logilab.common.testlib import TestCase, unittest_main
from cubicweb.server.sqlutils import *
BASE_CONFIG = {
'db-driver' : 'Postgres',
'db-host' : 'crater',
'db-name' : 'cubicweb2_test',
'db-user' : 'toto',
'db-upassword' : 'toto',
}
class SQLAdapterMixInTC(TestCase):
def test_init(self):
o = SQLAdapterMixIn(BASE_CONFIG)
self.assertEqual(o.dbhelper.dbencoding, 'UTF-8')
def test_init_encoding(self):
config = BASE_CONFIG.copy()
config['db-encoding'] = 'ISO-8859-1'
o = SQLAdapterMixIn(config)
self.assertEqual(o.dbhelper.dbencoding, 'ISO-8859-1')
if __name__ == '__main__':
unittest_main()