entities/schemaobjs.py
author sylvain.thenault@logilab.fr
Tue, 05 May 2009 19:35:55 +0200
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"""schema definition 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 logilab.common.decorators import cached
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from cubicweb import ValidationError
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from cubicweb.schema import ERQLExpression, RRQLExpression
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from cubicweb.entities import AnyEntity, fetch_config
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class CWEType(AnyEntity):
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    id = 'CWEType'
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    fetch_attrs, fetch_order = fetch_config(['name'])
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    def dc_title(self):
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        return self.req._(self.name)
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    def dc_long_title(self):
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        stereotypes = []
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        _ = self.req._
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        if self.meta:
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            stereotypes.append(_('meta'))
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        if self.final:
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            stereotypes.append(_('final'))
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        if stereotypes:
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            return u'%s <<%s>>' % (self.dc_title(), ', '.join(stereotypes))
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        return self.dc_title()
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    def db_key_name(self):
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        """XXX goa specific"""
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        return self.get('name')
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class CWRType(AnyEntity):
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    id = 'CWRType'
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    fetch_attrs, fetch_order = fetch_config(['name'])
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    def dc_title(self):
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        return self.req._(self.name)
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    def dc_long_title(self):
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        stereotypes = []
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        _ = self.req._
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        if self.meta:
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            stereotypes.append(_('meta'))
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        if self.symetric:
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            stereotypes.append(_('symetric'))
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        if self.inlined:
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            stereotypes.append(_('inlined'))
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        if self.final:
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            stereotypes.append(_('final'))
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        if stereotypes:
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            return u'%s <<%s>>' % (self.dc_title(), ', '.join(stereotypes))
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        return self.dc_title()
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    def inlined_changed(self, inlined):
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        """check inlining is necessary and possible:
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        * return False if nothing has changed
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        * raise ValidationError if inlining is'nt possible
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        * eventually return True
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        """
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        rtype = self.name
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        rschema = self.schema.rschema(rtype)
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        if inlined == rschema.inlined:
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            return False
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        if inlined:
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            for (stype, otype) in rschema.iter_rdefs():
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                card = rschema.rproperty(stype, otype, 'cardinality')[0]
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                if not card in '?1':
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                    msg = self.req._("can't set inlined=%(inlined)s, "
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                                     "%(stype)s %(rtype)s %(otype)s "
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                                     "has cardinality=%(card)s")
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                    raise ValidationError(self.eid, {'inlined': msg % locals()})
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        return True
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    def db_key_name(self):
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        """XXX goa specific"""
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        return self.get('name')
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class CWRelation(AnyEntity):
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    id = 'CWRelation'
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    fetch_attrs = fetch_config(['cardinality'])[0]
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    def dc_title(self):
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        return u'%s %s %s' % (
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            self.from_entity[0].name,
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            self.relation_type[0].name, 
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            self.to_entity[0].name)
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    def dc_long_title(self):
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        card = self.cardinality
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        scard, ocard = u'', u''
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        if card[0] != '1':
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            scard = '[%s]' % card[0]
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        if card[1] != '1':
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            ocard = '[%s]' % card[1]
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        return u'%s %s%s%s %s' % (
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            self.from_entity[0].name,
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            scard, self.relation_type[0].name, ocard,
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            self.to_entity[0].name)
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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.relation_type:
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            return self.relation_type[0].rest_path(), {}
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        return super(CWRelation, self).after_deletion_path()
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class CWAttribute(CWRelation):
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    id = 'CWAttribute'
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    def dc_long_title(self):
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        card = self.cardinality
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        scard = u''
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        if card[0] == '1':
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            scard = '+'
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        return u'%s %s%s %s' % (
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            self.from_entity[0].name,
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            scard, self.relation_type[0].name, 
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            self.to_entity[0].name)
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class CWConstraint(AnyEntity):
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    id = 'CWConstraint'
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    fetch_attrs, fetch_order = fetch_config(['value'])
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    def dc_title(self):
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        return '%s(%s)' % (self.cstrtype[0].name, self.value or u'')
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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.reverse_constrained_by:
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            return self.reverse_constrained_by[0].rest_path(), {}
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        return super(CWConstraint, self).after_deletion_path()
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    @property
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    def type(self):
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        return self.cstrtype[0].name
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class RQLExpression(AnyEntity):
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    id = 'RQLExpression'
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    fetch_attrs, fetch_order = fetch_config(['exprtype', 'mainvars', 'expression'])
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    def dc_title(self):
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        return '%s(%s)' % (self.exprtype, self.expression or u'')
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    @property
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    def expression_of(self):
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        for rel in ('read_permission', 'add_permission', 'delete_permission',
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                    'update_permission', 'condition'):
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            values = getattr(self, 'reverse_%s' % rel)
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            if values:
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                return values[0]
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    @cached
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    def _rqlexpr(self):
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        if self.exprtype == 'ERQLExpression':
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            return ERQLExpression(self.expression, self.mainvars, self.eid)
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        #if self.exprtype == 'RRQLExpression':
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        return RRQLExpression(self.expression, self.mainvars, self.eid)
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    def check_expression(self, *args, **kwargs):
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        return self._rqlexpr().check(*args, **kwargs)
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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.expression_of:
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            return self.expression_of.rest_path(), {}
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        return super(RQLExpression, self).after_deletion_path()
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class CWPermission(AnyEntity):
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    id = 'CWPermission'
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    fetch_attrs, fetch_order = fetch_config(['name', 'label'])
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    def dc_title(self):
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        if self.label:
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            return '%s (%s)' % (self.req._(self.name), self.label)
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        return self.req._(self.name)
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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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        permissionof = getattr(self, 'reverse_require_permission', ())
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        if len(permissionof) == 1:
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            return permissionof[0].rest_path(), {}
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        return super(CWPermission, self).after_deletion_path()