entities/wfobjs.py
author sylvain.thenault@logilab.fr
Thu, 26 Mar 2009 21:03:20 +0100
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"""workflow definition and history related entities
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:organization: Logilab
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:copyright: 2001-2009 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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__docformat__ = "restructuredtext en"
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from cubicweb.entities import AnyEntity, fetch_config
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class Transition(AnyEntity):
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    """customized class for Transition entities
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    provides a specific may_be_passed method to check if the relation may be
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    passed by the logged user
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    """
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    id = 'Transition'
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    fetch_attrs, fetch_order = fetch_config(['name'])
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    def may_be_passed(self, eid, stateeid):
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        """return true if the logged user may pass this transition
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        `eid` is the eid of the object on which we may pass the transition
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        `stateeid` is the eid of the current object'state XXX unused
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        """
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        user = self.req.user
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        # check user is at least in one of the required groups if any
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        groups = frozenset(g.name for g in self.require_group)
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        if groups:
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            matches = user.matching_groups(groups)
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            if matches:
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                return matches
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            if 'owners' in groups and user.owns(eid):
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                return True
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        # check one of the rql expression conditions matches if any
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        if self.condition:
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            for rqlexpr in self.condition:
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                if rqlexpr.check_expression(self.req, eid):
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                    return True
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        if self.condition or groups:
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            return False
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        return True
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    def destination(self):
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        return self.destination_state[0]
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    def after_deletion_path(self):
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        """return (path, parameters) which should be used as redirect
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        information when this entity is being deleted
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        """
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        if self.transition_of:
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            return self.transition_of[0].rest_path(), {'vid': 'workflow'}
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        return super(Transition, self).after_deletion_path()
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class State(AnyEntity):
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    """customized class for State entities
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    provides a specific transitions method returning transitions that may be
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    passed by the current user for the given entity
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    """
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    id = 'State'
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    fetch_attrs, fetch_order = fetch_config(['name'])
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    rest_attr = 'eid'
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    def transitions(self, entity, desteid=None):
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        rql = ('Any T,N,DS where S allowed_transition T, S eid %(x)s, '
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               'T name N, T destination_state DS, '
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               'T transition_of ET, ET name %(et)s')
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        if desteid is not None:
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            rql += ', DS eid %(ds)s'
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        rset = self.req.execute(rql, {'x': self.eid, 'et': str(entity.e_schema),
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                                         'ds': desteid}, 'x')
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        for tr in rset.entities():
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            if tr.may_be_passed(entity.eid, self.eid):
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                yield tr
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    def after_deletion_path(self):
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        """return (path, parameters) which should be used as redirect
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        information when this entity is being deleted
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        """
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        if self.state_of:
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            return self.state_of[0].rest_path(), {'vid': 'workflow'}
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        return super(State, self).after_deletion_path()
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class TrInfo(AnyEntity):
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    """customized class for Transition information entities
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    """
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    id = 'TrInfo'
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    fetch_attrs, fetch_order = fetch_config(['creation_date', 'comment'],
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                                            pclass=None) # don't want modification_date
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    @property
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    def for_entity(self):
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        return self.wf_info_for and self.wf_info_for[0]
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    @property
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    def previous_state(self):
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        return self.from_state and self.from_state[0]
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    @property
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    def new_state(self):
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        return self.to_state[0]
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    def after_deletion_path(self):
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        """return (path, parameters) which should be used as redirect
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        information when this entity is being deleted
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        """
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        if self.for_entity:
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            return self.for_entity.rest_path(), {}
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        return 'view', {}