[schema] fix unique together index handling
We now provide a more compact indexname, using the schema constraint
entity type and the position of the columns set in the entity type
unique constraints list.
This avoids a nasty name truncation issue.
The UniqueTogetherError object is made smarter: it computes the
rtypes, abstracting the underlying backend (pg/sqlserver vs sqlite).
The `user friendly` adapter is much simplified since there is no
longer any truncation issue.
Uses a new logilab.database version (ticket #151507) and a new yams
version (ticket #189299)
Closes #2514939
[jcr: disable hooks when temporarily dropping CWUniqueTogetherConstraint entities]
# 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/>.
""" CW - nevow/twisted client
"""