schemas/workflow.py
author Denis Laxalde <denis.laxalde@logilab.fr>
Wed, 22 Jul 2015 10:55:39 +0200
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[tox] Remove set of PATH environment variable The : concatenation does not work actually so the resulting PATH was just wrong (it did not contain the previous PATH). Anyways, the PATH environment variable is passed by default by tox so it's probably better to let the caller set it (thus avoiding to hard-code the specific postgres version and path). http://tox.readthedocs.org/en/latest/example/basic.html#passing-down-environment-variables
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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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"""workflow related schemas
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"""
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__docformat__ = "restructuredtext en"
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_ = unicode
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from yams.buildobjs import (EntityType, RelationType, RelationDefinition,
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                            SubjectRelation,
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                            RichString, String, Int)
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from cubicweb.schema import RQLConstraint
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from cubicweb.schemas import (PUB_SYSTEM_ENTITY_PERMS, PUB_SYSTEM_REL_PERMS,
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                              RO_REL_PERMS)
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class Workflow(EntityType):
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    __permissions__ = PUB_SYSTEM_ENTITY_PERMS
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    name = String(required=True, indexed=True, internationalizable=True,
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                  maxsize=256)
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    description = RichString(default_format='text/rest',
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                             description=_('semantic description of this workflow'))
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    workflow_of = SubjectRelation('CWEType', cardinality='+*',
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                                  description=_('entity types which may use this workflow'),
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                                  constraints=[RQLConstraint('O final FALSE')])
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    initial_state = SubjectRelation('State', cardinality='?*',
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                                   constraints=[RQLConstraint('O state_of S',
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                                                              msg=_('state doesn\'t belong to this workflow'))],
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                                   description=_('initial state for this workflow'))
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class default_workflow(RelationType):
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    """default workflow for an entity type"""
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    __permissions__ = PUB_SYSTEM_REL_PERMS
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    subject = 'CWEType'
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    object = 'Workflow'
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    cardinality = '?*'
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    constraints = [RQLConstraint('S final FALSE, O workflow_of S',
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                                 msg=_('workflow isn\'t a workflow for this type'))]
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class State(EntityType):
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    """used to associate simple states to an entity type and/or to define
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    workflows
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    """
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    __permissions__ = PUB_SYSTEM_ENTITY_PERMS
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    __unique_together__ = [('name', 'state_of')]
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    name = String(required=True, indexed=True, internationalizable=True, maxsize=256)
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    description = RichString(default_format='text/rest',
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                             description=_('semantic description of this state'))
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    # XXX should be on BaseTransition w/ AND/OR selectors when we will
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    # implements #345274
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    allowed_transition = SubjectRelation('BaseTransition', cardinality='**',
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                                         constraints=[RQLConstraint('S state_of WF, O transition_of WF',
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                                                                    msg=_('state and transition don\'t belong the the same workflow'))],
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                                         description=_('allowed transitions from this state'))
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    state_of = SubjectRelation('Workflow', cardinality='1*', composite='object', inlined=True,
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                               description=_('workflow to which this state belongs'))
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class BaseTransition(EntityType):
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    """abstract base class for transitions"""
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    __permissions__ = PUB_SYSTEM_ENTITY_PERMS
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    __unique_together__ = [('name', 'transition_of')]
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    name = String(required=True, indexed=True, internationalizable=True, maxsize=256)
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    type = String(vocabulary=(_('normal'), _('auto')), default='normal')
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    description = RichString(description=_('semantic description of this transition'))
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    transition_of = SubjectRelation('Workflow', cardinality='1*', composite='object', inlined=True,
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                                    description=_('workflow to which this transition belongs'))
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class require_group(RelationDefinition):
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    """group in which a user should be to be allowed to pass this transition"""
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    __permissions__ = PUB_SYSTEM_REL_PERMS
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    subject = 'BaseTransition'
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    object = 'CWGroup'
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class condition(RelationDefinition):
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    """a RQL expression which should return some results, else the transition
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    won't be available.
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    This query may use X and U variables that will respectivly represents the
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    current entity and the current user.
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    """
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    __permissions__ = PUB_SYSTEM_REL_PERMS
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    subject = 'BaseTransition'
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    object = 'RQLExpression'
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    cardinality = '*?'
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    composite = 'subject'
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class Transition(BaseTransition):
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    """use to define a transition from one or multiple states to a destination
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    states in workflow's definitions. Transition without destination state will
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    go back to the state from which we arrived to the current state.
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    """
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    __specializes_schema__ = True
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    destination_state = SubjectRelation(
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        'State', cardinality='?*',
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        constraints=[RQLConstraint('S transition_of WF, O state_of WF',
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                                   msg=_('state and transition don\'t belong the the same workflow'))],
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        description=_('destination state for this transition'))
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class WorkflowTransition(BaseTransition):
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    """special transition allowing to go through a sub-workflow"""
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    __specializes_schema__ = True
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    subworkflow = SubjectRelation('Workflow', cardinality='1*',
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                                  constraints=[RQLConstraint('S transition_of WF, WF workflow_of ET, O workflow_of ET',
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                                                             msg=_('subworkflow isn\'t a workflow for the same types as the transition\'s workflow'))]
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                                  )
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    # XXX use exit_of and inline it
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    subworkflow_exit = SubjectRelation('SubWorkflowExitPoint', cardinality='*1',
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                                       composite='subject')
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class SubWorkflowExitPoint(EntityType):
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    """define how we get out from a sub-workflow"""
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    subworkflow_state = SubjectRelation(
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        'State', cardinality='1*',
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        constraints=[RQLConstraint('T subworkflow_exit S, T subworkflow WF, O state_of WF',
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                                   msg=_('exit state must be a subworkflow state'))],
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        description=_('subworkflow state'))
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    destination_state = SubjectRelation(
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        'State', cardinality='?*',
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        constraints=[RQLConstraint('T subworkflow_exit S, T transition_of WF, O state_of WF',
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                                   msg=_('destination state must be in the same workflow as our parent transition'))],
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        description=_('destination state. No destination state means that transition '
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                      'should go back to the state from which we\'ve entered the '
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                      'subworkflow.'))
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class TrInfo(EntityType):
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    """workflow history item"""
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    # 'add' security actually done by hooks
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    __permissions__ = {
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        'read':   ('managers', 'users', 'guests',), # XXX U has_read_permission O ?
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        'add':    ('managers', 'users', 'guests',),
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        'delete': (), # XXX should we allow managers to delete TrInfo?
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        'update': ('managers', 'owners',),
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    }
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    # The unique_together constraint ensures that 2 repositories
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    # sharing the db won't be able to fire a transition simultaneously
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    # on the same entity tr_count is filled in the FireTransitionHook
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    # to the number of TrInfo attached to the entity on which we
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    # attempt to fire a transition. In other word, it contains the
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    # rank of the TrInfo for that entity, and the constraint says we
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    # cannot have 2 TrInfo with the same rank.
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    __unique_together__ = [('tr_count', 'wf_info_for')]
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    from_state = SubjectRelation('State', cardinality='1*', inlined=True)
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    to_state = SubjectRelation('State', cardinality='1*', inlined=True)
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    # make by_transition optional because we want to allow managers to set
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    # entity into an arbitrary state without having to respect wf transition
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    by_transition = SubjectRelation('BaseTransition', cardinality='?*')
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    comment = RichString(fulltextindexed=True, default_format='text/plain')
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    tr_count = Int(description='autocomputed attribute used to ensure transition coherency')
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    # get actor and date time using owned_by and creation_date
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class from_state(RelationType):
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    __permissions__ = RO_REL_PERMS.copy()
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    inlined = True
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class to_state(RelationType):
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    __permissions__ = RO_REL_PERMS.copy()
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    inlined = True
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class by_transition(RelationType):
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    # 'add' security actually done by hooks
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    __permissions__ = {
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        'read':   ('managers', 'users', 'guests',),
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        'add':    ('managers', 'users', 'guests',),
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        'delete': (),
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    }
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    inlined = True
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class workflow_of(RelationType):
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    """link a workflow to one or more entity type"""
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    __permissions__ = PUB_SYSTEM_REL_PERMS
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class state_of(RelationType):
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    """link a state to one or more workflow"""
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    __permissions__ = PUB_SYSTEM_REL_PERMS
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    inlined = True
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class transition_of(RelationType):
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    """link a transition to one or more workflow"""
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    __permissions__ = PUB_SYSTEM_REL_PERMS
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    inlined = True
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class destination_state(RelationType):
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    """destination state of a transition"""
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    __permissions__ = PUB_SYSTEM_REL_PERMS
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    inlined = True
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class allowed_transition(RelationType):
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    """allowed transitions from this state"""
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    __permissions__ = PUB_SYSTEM_REL_PERMS
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class initial_state(RelationType):
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    """indicate which state should be used by default when an entity using
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    states is created
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    """
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    __permissions__ = PUB_SYSTEM_REL_PERMS
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    inlined = True
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class subworkflow(RelationType):
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    __permissions__ = PUB_SYSTEM_REL_PERMS
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    inlined = True
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class exit_point(RelationType):
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    __permissions__ = PUB_SYSTEM_REL_PERMS
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class subworkflow_state(RelationType):
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    __permissions__ = PUB_SYSTEM_REL_PERMS
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    inlined = True
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# "abstract" relations, set by WorkflowableEntityType ##########################
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class custom_workflow(RelationType):
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    """allow to set a specific workflow for an entity"""
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    __permissions__ = PUB_SYSTEM_REL_PERMS
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    cardinality = '?*'
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    constraints = [RQLConstraint('S is ET, O workflow_of ET',
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                                 msg=_('workflow isn\'t a workflow for this type'))]
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    object = 'Workflow'
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class wf_info_for(RelationType):
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    """link a transition information to its object"""
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    # 'add' security actually done by hooks
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    __permissions__ = {
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        'read':   ('managers', 'users', 'guests',),
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        'add':    ('managers', 'users', 'guests',),
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        'delete': (),
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    }
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    inlined = True
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    cardinality = '1*'
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    composite = 'object'
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    fulltext_container = composite
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    subject = 'TrInfo'
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class in_state(RelationType):
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    """indicate the current state of an entity"""
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    __permissions__ = RO_REL_PERMS
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    # not inlined intentionnaly since when using ldap sources, user'state
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    # has to be stored outside the CWUser table
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    inlined = False
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    cardinality = '1*'
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    constraints = [RQLConstraint('S is ET, O state_of WF, WF workflow_of ET',
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                                 msg=_('state doesn\'t apply to this entity\'s type'))]
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    object = 'State'