author | Sylvain Thénault <sylvain.thenault@logilab.fr> |
Wed, 13 Jan 2010 15:56:31 +0100 | |
changeset 4225 | c49bb6e3d343 |
parent 4190 | 742e3eb16f81 |
child 4307 | 7fba9c34c88f |
permissions | -rw-r--r-- |
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"""Core hooks: check for data integrity according to the instance'schema |
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validity |
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|
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:organization: Logilab |
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:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2. |
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr |
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses |
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""" |
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__docformat__ = "restructuredtext en" |
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|
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from cubicweb import ValidationError |
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from cubicweb.schema import RQLConstraint, RQLUniqueConstraint |
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from cubicweb.selectors import implements |
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from cubicweb.uilib import soup2xhtml |
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from cubicweb.server import hook |
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# special relations that don't have to be checked for integrity, usually |
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# because they are handled internally by hooks (so we trust ourselves) |
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DONT_CHECK_RTYPES_ON_ADD = set(('owned_by', 'created_by', |
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'is', 'is_instance_of', |
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'wf_info_for', 'from_state', 'to_state')) |
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DONT_CHECK_RTYPES_ON_DEL = set(('is', 'is_instance_of', |
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'wf_info_for', 'from_state', 'to_state')) |
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class _CheckRequiredRelationOperation(hook.LateOperation): |
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"""checking relation cardinality has to be done after commit in |
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case the relation is being replaced |
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""" |
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eid, rtype = None, None |
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def precommit_event(self): |
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# recheck pending eids |
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if self.session.deleted_in_transaction(self.eid): |
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return |
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if self.rtype in self.session.transaction_data.get('pendingrtypes', ()): |
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return |
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if self.session.unsafe_execute(*self._rql()).rowcount < 1: |
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etype = self.session.describe(self.eid)[0] |
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_ = self.session._ |
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msg = _('at least one relation %(rtype)s is required on %(etype)s (%(eid)s)') |
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msg %= {'rtype': _(self.rtype), 'etype': _(etype), 'eid': self.eid} |
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raise ValidationError(self.eid, {self.rtype: msg}) |
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def commit_event(self): |
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pass |
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def _rql(self): |
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raise NotImplementedError() |
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class _CheckSRelationOp(_CheckRequiredRelationOperation): |
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"""check required subject relation""" |
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def _rql(self): |
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return 'Any O WHERE S eid %%(x)s, S %s O' % self.rtype, {'x': self.eid}, 'x' |
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class _CheckORelationOp(_CheckRequiredRelationOperation): |
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"""check required object relation""" |
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def _rql(self): |
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return 'Any S WHERE O eid %%(x)s, S %s O' % self.rtype, {'x': self.eid}, 'x' |
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class IntegrityHook(hook.Hook): |
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__abstract__ = True |
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category = 'integrity' |
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class UserIntegrityHook(IntegrityHook): |
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__abstract__ = True |
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__select__ = IntegrityHook.__select__ & hook.regular_session() |
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class CheckCardinalityHook(UserIntegrityHook): |
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"""check cardinalities are satisfied""" |
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__regid__ = 'checkcard' |
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events = ('after_add_entity', 'before_delete_relation') |
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def __call__(self): |
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getattr(self, self.event)() |
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def checkrel_if_necessary(self, opcls, rtype, eid): |
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"""check an equivalent operation has not already been added""" |
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for op in self._cw.pending_operations: |
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if isinstance(op, opcls) and op.rtype == rtype and op.eid == eid: |
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break |
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else: |
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opcls(self._cw, rtype=rtype, eid=eid) |
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def after_add_entity(self): |
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eid = self.entity.eid |
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eschema = self.entity.e_schema |
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for rschema, targetschemas, role in eschema.relation_definitions(): |
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# skip automatically handled relations |
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if rschema.type in DONT_CHECK_RTYPES_ON_ADD: |
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continue |
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opcls = role == 'subject' and _CheckSRelationOp or _CheckORelationOp |
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rdef = rschema.role_rdef(eschema, targetschemas[0], role) |
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if rdef.role_cardinality(role) in '1+': |
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self.checkrel_if_necessary(opcls, rschema.type, eid) |
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def before_delete_relation(self): |
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rtype = self.rtype |
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if rtype in DONT_CHECK_RTYPES_ON_DEL: |
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return |
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session = self._cw |
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eidfrom, eidto = self.eidfrom, self.eidto |
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107 |
card = session.schema_rproperty(rtype, eidfrom, eidto, 'cardinality') |
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108 |
pendingrdefs = session.transaction_data.get('pendingrdefs', ()) |
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109 |
if (session.describe(eidfrom)[0], rtype, session.describe(eidto)[0]) in pendingrdefs: |
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110 |
return |
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111 |
if card[0] in '1+' and not session.deleted_in_transaction(eidfrom): |
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112 |
self.checkrel_if_necessary(_CheckSRelationOp, rtype, eidfrom) |
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113 |
if card[1] in '1+' and not session.deleted_in_transaction(eidto): |
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114 |
self.checkrel_if_necessary(_CheckORelationOp, rtype, eidto) |
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115 |
|
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116 |
|
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117 |
class _CheckConstraintsOp(hook.LateOperation): |
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118 |
"""check a new relation satisfy its constraints |
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119 |
""" |
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120 |
def precommit_event(self): |
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121 |
eidfrom, rtype, eidto = self.rdef |
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122 |
# first check related entities have not been deleted in the same |
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123 |
# transaction |
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124 |
if self.session.deleted_in_transaction(eidfrom): |
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125 |
return |
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126 |
if self.session.deleted_in_transaction(eidto): |
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127 |
return |
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128 |
for constraint in self.constraints: |
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129 |
try: |
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130 |
constraint.repo_check(self.session, eidfrom, rtype, eidto) |
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131 |
except NotImplementedError: |
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132 |
self.critical('can\'t check constraint %s, not supported', |
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133 |
constraint) |
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|
134 |
|
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|
135 |
def commit_event(self): |
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|
136 |
pass |
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|
137 |
|
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|
138 |
|
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139 |
class CheckConstraintHook(UserIntegrityHook): |
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140 |
"""check the relation satisfy its constraints |
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|
141 |
|
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|
142 |
this is delayed to a precommit time operation since other relation which |
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143 |
will make constraint satisfied (or unsatisfied) may be added later. |
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|
144 |
""" |
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|
145 |
__regid__ = 'checkconstraint' |
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|
146 |
events = ('after_add_relation',) |
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147 |
|
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|
148 |
def __call__(self): |
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149 |
# XXX get only RQL[Unique]Constraints? |
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150 |
constraints = self._cw.schema_rproperty(self.rtype, self.eidfrom, self.eidto, |
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151 |
'constraints') |
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152 |
if constraints: |
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153 |
_CheckConstraintsOp(self._cw, constraints=constraints, |
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154 |
rdef=(self.eidfrom, self.rtype, self.eidto)) |
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|
155 |
|
4027 | 156 |
|
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|
157 |
class CheckAttributeConstraintHook(UserIntegrityHook): |
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|
158 |
"""check the attribute relation satisfy its constraints |
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|
159 |
|
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|
160 |
this is delayed to a precommit time operation since other relation which |
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|
161 |
will make constraint satisfied (or unsatisfied) may be added later. |
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|
162 |
""" |
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|
163 |
__regid__ = 'checkattrconstraint' |
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|
164 |
events = ('after_add_entity', 'after_update_entity') |
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|
165 |
|
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|
166 |
def __call__(self): |
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|
167 |
eschema = self.entity.e_schema |
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|
168 |
for attr in self.entity.edited_attributes: |
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|
169 |
if eschema.subjrels[attr].final: |
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|
170 |
constraints = [c for c in eschema.rdef(attr).constraints |
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|
171 |
if isinstance(c, (RQLUniqueConstraint, RQLConstraint))] |
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|
172 |
if constraints: |
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|
173 |
_CheckConstraintsOp(self._cw, constraints=constraints, |
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|
174 |
rdef=(self.entity.eid, attr, None)) |
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|
175 |
|
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|
176 |
|
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|
177 |
class CheckUniqueHook(UserIntegrityHook): |
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|
178 |
__regid__ = 'checkunique' |
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|
179 |
events = ('before_add_entity', 'before_update_entity') |
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|
180 |
|
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|
181 |
def __call__(self): |
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|
182 |
entity = self.entity |
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|
183 |
eschema = entity.e_schema |
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|
184 |
for attr in entity.edited_attributes: |
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|
185 |
if eschema.subjrels[attr].final and eschema.has_unique_values(attr): |
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|
186 |
val = entity[attr] |
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|
187 |
if val is None: |
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|
188 |
continue |
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|
189 |
rql = '%s X WHERE X %s %%(val)s' % (entity.e_schema, attr) |
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|
190 |
rset = self._cw.unsafe_execute(rql, {'val': val}) |
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|
191 |
if rset and rset[0][0] != entity.eid: |
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|
192 |
msg = self._cw._('the value "%s" is already used, use another one') |
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|
193 |
raise ValidationError(entity.eid, {attr: msg % val}) |
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|
194 |
|
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|
195 |
|
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|
196 |
class _DelayedDeleteOp(hook.Operation): |
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|
197 |
"""delete the object of composite relation except if the relation |
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|
198 |
has actually been redirected to another composite |
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|
199 |
""" |
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|
200 |
|
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|
201 |
def precommit_event(self): |
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|
202 |
session = self.session |
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|
203 |
# don't do anything if the entity is being created or deleted |
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|
204 |
if not (session.deleted_in_transaction(self.eid) or |
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|
205 |
session.added_in_transaction(self.eid)): |
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|
206 |
etype = session.describe(self.eid)[0] |
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|
207 |
session.unsafe_execute('DELETE %s X WHERE X eid %%(x)s, NOT %s' |
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|
208 |
% (etype, self.relation), |
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|
209 |
{'x': self.eid}, 'x') |
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|
210 |
|
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|
211 |
|
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|
212 |
class DeleteCompositeOrphanHook(IntegrityHook): |
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|
213 |
"""delete the composed of a composite relation when this relation is deleted |
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""" |
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__regid__ = 'deletecomposite' |
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events = ('before_delete_relation',) |
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|
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def __call__(self): |
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# if the relation is being delete, don't delete composite's components |
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# automatically |
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pendingrdefs = self._cw.transaction_data.get('pendingrdefs', ()) |
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if (self._cw.describe(self.eidfrom)[0], self.rtype, |
223 |
self._cw.describe(self.eidto)[0]) in pendingrdefs: |
|
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return |
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composite = self._cw.schema_rproperty(self.rtype, self.eidfrom, self.eidto, |
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'composite') |
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if composite == 'subject': |
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_DelayedDeleteOp(self._cw, eid=self.eidto, |
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relation='Y %s X' % self.rtype) |
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elif composite == 'object': |
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_DelayedDeleteOp(self._cw, eid=self.eidfrom, |
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relation='X %s Y' % self.rtype) |
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233 |
|
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234 |
|
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class DontRemoveOwnersGroupHook(IntegrityHook): |
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"""delete the composed of a composite relation when this relation is deleted |
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""" |
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__regid__ = 'checkownersgroup' |
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__select__ = IntegrityHook.__select__ & implements('CWGroup') |
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events = ('before_delete_entity', 'before_update_entity') |
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241 |
|
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def __call__(self): |
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if self.event == 'before_delete_entity' and self.entity.name == 'owners': |
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raise ValidationError(self.entity.eid, {None: self._cw._('can\'t be deleted')}) |
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elif self.event == 'before_update_entity' and 'name' in self.entity.edited_attributes: |
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newname = self.entity.pop('name') |
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oldname = self.entity.name |
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if oldname == 'owners' and newname != oldname: |
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raise ValidationError(self.entity.eid, {'name': self._cw._('can\'t be changed')}) |
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self.entity['name'] = newname |
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|
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252 |
|
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class TidyHtmlFields(UserIntegrityHook): |
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"""tidy HTML in rich text strings""" |
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__regid__ = 'htmltidy' |
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events = ('before_add_entity', 'before_update_entity') |
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257 |
|
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def __call__(self): |
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entity = self.entity |
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metaattrs = entity.e_schema.meta_attributes() |
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for metaattr, (metadata, attr) in metaattrs.iteritems(): |
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if metadata == 'format' and attr in entity.edited_attributes: |
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263 |
try: |
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value = entity[attr] |
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except KeyError: |
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continue # no text to tidy |
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if isinstance(value, unicode): # filter out None and Binary |
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if getattr(entity, str(metaattr)) == 'text/html': |
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entity[attr] = soup2xhtml(value, self._cw.encoding) |
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270 |
|
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271 |
|
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class StripCWUserLoginHook(IntegrityHook): |
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"""ensure user logins are stripped""" |
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__regid__ = 'stripuserlogin' |
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__select__ = IntegrityHook.__select__ & implements('CWUser') |
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events = ('before_add_entity', 'before_update_entity',) |
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|
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def __call__(self): |
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user = self.entity |
|
280 |
if 'login' in user.edited_attributes and user.login: |
|
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user.login = user.login.strip() |