hooks/metadata.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Fri, 16 Sep 2011 14:43:41 +0200
branchstable
changeset 7804 814fb7f379a3
parent 7708 45be3a9debe6
child 7879 9aae456abab5
permissions -rw-r--r--
[sources management] properly set __linkto, closes #1922970 when clicking on 'add mapping part' on an external source view, one expect to have source properly selected in form
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# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""Core hooks: set generic metadata"""
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__docformat__ = "restructuredtext en"
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from datetime import datetime
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from cubicweb.selectors import is_instance
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from cubicweb.server import hook
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from cubicweb.server.edition import EditedEntity
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class MetaDataHook(hook.Hook):
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    __abstract__ = True
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    category = 'metadata'
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class InitMetaAttrsHook(MetaDataHook):
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    """before create a new entity -> set creation and modification date
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    this is a conveniency hook, you shouldn't have to disable it
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    """
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    __regid__ = 'metaattrsinit'
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    events = ('before_add_entity',)
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    def __call__(self):
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        timestamp = datetime.now()
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        edited = self.entity.cw_edited
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        if not edited.get('creation_date'):
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            edited['creation_date'] = timestamp
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        if not edited.get('modification_date'):
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            edited['modification_date'] = timestamp
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        if not self._cw.get_shared_data('do-not-insert-cwuri'):
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            cwuri = u'%s%s' % (self._cw.base_url(), self.entity.eid)
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            edited.setdefault('cwuri', cwuri)
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class UpdateMetaAttrsHook(MetaDataHook):
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    """update an entity -> set modification date"""
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    __regid__ = 'metaattrsupdate'
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    events = ('before_update_entity',)
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    def __call__(self):
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        # repairing is true during c-c upgrade/shell and similar commands. We
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        # usually don't want to update modification date in such cases.
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        #
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        # XXX to be really clean, we should turn off modification_date update
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        # explicitly on each command where we do not want that behaviour.
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        if not self._cw.vreg.config.repairing:
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            self.entity.cw_edited.setdefault('modification_date', datetime.now())
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class SetCreatorOp(hook.DataOperationMixIn, hook.Operation):
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    def precommit_event(self):
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        session = self.session
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        relations = [(eid, session.user.eid) for eid in self.get_data()
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                # don't consider entities that have been created and deleted in
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                # the same transaction, nor ones where created_by has been
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                # explicitly set
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                if not session.deleted_in_transaction(eid) and \
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                   not session.entity_from_eid(eid).created_by]
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        session.add_relations([('created_by', relations)])
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class SetOwnershipHook(MetaDataHook):
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    """create a new entity -> set owner and creator metadata"""
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    __regid__ = 'setowner'
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    events = ('after_add_entity',)
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    def __call__(self):
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        if not self._cw.is_internal_session:
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            self._cw.add_relation(self.entity.eid, 'owned_by', self._cw.user.eid)
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            SetCreatorOp.get_instance(self._cw).add_data(self.entity.eid)
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class SyncOwnersOp(hook.DataOperationMixIn, hook.Operation):
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    def precommit_event(self):
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        for compositeeid, composedeid in self.get_data():
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            self.session.execute('SET X owned_by U WHERE C owned_by U, C eid %(c)s,'
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                                 'NOT EXISTS(X owned_by U, X eid %(x)s)',
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                                 {'c': compositeeid, 'x': composedeid})
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class SyncCompositeOwner(MetaDataHook):
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    """when adding composite relation, the composed should have the same owners
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    has the composite
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    """
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    __regid__ = 'synccompositeowner'
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    events = ('after_add_relation',)
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    def __call__(self):
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        if self.rtype == 'wf_info_for':
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            # skip this special composite relation # XXX (syt) why?
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            return
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        eidfrom, eidto = self.eidfrom, self.eidto
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        composite = self._cw.rtype_eids_rdef(self.rtype, eidfrom, eidto).composite
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        if composite == 'subject':
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            SyncOwnersOp.get_instance(self._cw).add_data( (eidfrom, eidto) )
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        elif composite == 'object':
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            SyncOwnersOp.get_instance(self._cw).add_data( (eidto, eidfrom) )
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class FixUserOwnershipHook(MetaDataHook):
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    """when a user has been created, add owned_by relation on itself"""
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    __regid__ = 'fixuserowner'
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    __select__ = MetaDataHook.__select__ & is_instance('CWUser')
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    events = ('after_add_entity',)
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    def __call__(self):
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        self._cw.add_relation(self.entity.eid, 'owned_by', self.entity.eid)
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class UpdateFTIHook(MetaDataHook):
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    """sync fulltext index text index container when a relation with
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    fulltext_container set is added / removed
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    """
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    __regid__ = 'updateftirel'
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    events = ('after_add_relation', 'after_delete_relation')
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    def __call__(self):
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        rtype = self.rtype
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        session = self._cw
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        ftcontainer = session.vreg.schema.rschema(rtype).fulltext_container
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        if ftcontainer == 'subject':
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            session.repo.system_source.index_entity(
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                session, session.entity_from_eid(self.eidfrom))
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        elif ftcontainer == 'object':
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            session.repo.system_source.index_entity(
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                session, session.entity_from_eid(self.eidto))
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# entity source handling #######################################################
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class ChangeEntityUpdateCaches(hook.Operation):
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    def postcommit_event(self):
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        self.oldsource.reset_caches()
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        repo = self.session.repo
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        entity = self.entity
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        extid = entity.cw_metainformation()['extid']
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        repo._type_source_cache[entity.eid] = (
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            entity.__regid__, self.newsource.uri, None, self.newsource.uri)
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        if self.oldsource.copy_based_source:
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            uri = 'system'
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        else:
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            uri = self.oldsource.uri
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        repo._extid_cache[(extid, uri)] = -entity.eid
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   165
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class ChangeEntitySourceDeleteHook(MetaDataHook):
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    """support for moving an entity from an external source by watching 'Any
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    cw_source CWSource' relation
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    """
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   170
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    __regid__ = 'cw.metadata.source-change'
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    __select__ = MetaDataHook.__select__ & hook.match_rtype('cw_source')
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    events = ('before_delete_relation',)
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   174
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    def __call__(self):
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        if (self._cw.deleted_in_transaction(self.eidfrom)
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            or self._cw.deleted_in_transaction(self.eidto)):
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            return
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        schange = self._cw.transaction_data.setdefault('cw_source_change', {})
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        schange[self.eidfrom] = self.eidto
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class ChangeEntitySourceAddHook(MetaDataHook):
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    __regid__ = 'cw.metadata.source-change'
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    __select__ = MetaDataHook.__select__ & hook.match_rtype('cw_source')
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    events = ('before_add_relation',)
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   187
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    def __call__(self):
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        schange = self._cw.transaction_data.get('cw_source_change')
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        if schange is not None and self.eidfrom in schange:
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            newsource = self._cw.entity_from_eid(self.eidto)
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            if newsource.name != 'system':
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                raise Exception('changing source to something else than the '
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                                'system source is unsupported')
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            syssource = newsource.repo_source
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            oldsource = self._cw.entity_from_eid(schange[self.eidfrom])
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            entity = self._cw.entity_from_eid(self.eidfrom)
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            # copy entity if necessary
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            if not oldsource.repo_source.copy_based_source:
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                entity.complete(skip_bytes=False)
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                if not entity.creation_date:
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                    entity.cw_attr_cache['creation_date'] = datetime.now()
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                if not entity.modification_date:
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                    entity.cw_attr_cache['modification_date'] = datetime.now()
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                entity.cw_attr_cache['cwuri'] = u'%s%s' % (self._cw.base_url(), entity.eid)
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                for rschema, attrschema in entity.e_schema.attribute_definitions():
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                    if attrschema == 'Password' and \
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                       rschema.rdef(entity.e_schema, attrschema).cardinality[0] == '1':
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                        from logilab.common.shellutils import generate_password
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                        entity.cw_attr_cache[rschema.type] = generate_password()
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                entity.cw_edited = EditedEntity(entity, **entity.cw_attr_cache)
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                syssource.add_entity(self._cw, entity)
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            # we don't want the moved entity to be reimported later.  To
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            # distinguish this state, the trick is to change the associated
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            # record in the 'entities' system table with eid=-eid while leaving
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            # other fields unchanged, and to add a new record with eid=eid,
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            # source='system'. External source will then have consider case
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            # where `extid2eid` return a negative eid as 'this entity was known
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            # but has been moved, ignore it'.
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            self._cw.system_sql('UPDATE entities SET eid=-eid WHERE eid=%(eid)s',
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                                {'eid': self.eidfrom})
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            attrs = {'type': entity.__regid__, 'eid': entity.eid, 'extid': None,
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                     'source': 'system', 'asource': 'system',
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                     'mtime': datetime.now()}
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            self._cw.system_sql(syssource.sqlgen.insert('entities', attrs), attrs)
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            # register an operation to update repository/sources caches
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            ChangeEntityUpdateCaches(self._cw, entity=entity,
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                                     oldsource=oldsource.repo_source,
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                                     newsource=syssource)