636     events = ('after_add_relation',)

   636     events = ('after_add_relation',)

   637 

   637 

   638     # to set in concrete class (mandatory)

   638     # to set in concrete class (mandatory)

   639     subject_relations = None

   639     subject_relations = None

   640     object_relations = None

   640     object_relations = None

   642     skip_subject_relations = ()

   642     skip_subject_relations = ()

   643     skip_object_relations = ()

   643     skip_object_relations = ()

   644 

   644 

   645     def __call__(self):

   645     def __call__(self):

   646         eschema = self._cw.vreg.schema.eschema(self._cw.entity_metas(self.eidfrom)['type'])

   646         eschema = self._cw.vreg.schema.eschema(self._cw.entity_metas(self.eidfrom)['type'])

   713 

   713 

   714     * `rollback`:

   714     * `rollback`:

   715 

   715 

   716       the transaction has been either rolled back either:

   716       the transaction has been either rolled back either:

   717 

   717 

   719        * a 'precommit' event failed, in which case all operations are rolled back

   719        * a 'precommit' event failed, in which case all operations are rolled back

   720          once 'revertprecommit'' has been called

   720          once 'revertprecommit'' has been called

   721 

   721 

   722     * `postcommit`:

   722     * `postcommit`:

   723 

   723