def save_formset_deletion_allowed_if_only(
self, request, form, formset, change, classes
):
"""
Helper which has is most useful when used inside ``save_formsets``
To use this method properly, your model has to inherit from
``towel.deletion.Model``. This is NOT enforced. If you ignore this, the
instances will be deleted by ``formset.save()`` as is the default with
Django.
Example::
def save_formsets(self, requset, form, formsets, change):
# Allow deleting states when the cascade includes
# ``SomeModel`` instances only.
self.save_formset_deletion_allowed_if_only(
request, form, formsets['states'], change, [SomeModel])
# No special handling for other formsets
self.save_formset(request, form, formsets['otherformset'],
change=change)
"""
with deletion.protect():
self.save_formset(request, form, formset, change)
for instance in formset.deleted_objects:
related = set(related_classes(instance))
related.discard(instance.__class__)
for class_ in classes:
related.discard(class_)
if len(related):
pretty_classes = [
force_text(class_._meta.verbose_name_plural) for class_ in related
]
if len(pretty_classes) > 1:
pretty_classes = "".join(
(
", ".join(pretty_classes[:-1]),
ugettext(" and "),
pretty_classes[-1],
)
)
else:
pretty_classes = pretty_classes[-1]
self.add_message(
request,
"deletion_denied_related",
{"pretty_classes": pretty_classes},
)
else:
instance.delete()
def save_formset_deletion_allowed_if_only(self, request, form, formset,
change, classes):
"""
Helper which has is most useful when used inside ``save_formsets``
To use this method properly, your model has to inherit from
``towel.deletion.Model``. This is NOT enforced. If you ignore this, the
instances will be deleted by ``formset.save()`` as is the default with
Django.
Example::
def save_formsets(self, requset, form, formsets, change):
# Allow deleting states when the cascade includes
# ``SomeModel`` instances only.
self.save_formset_deletion_allowed_if_only(
request, form, formsets['states'], change, [SomeModel])
# No special handling for other formsets
self.save_formset(request, form, formsets['otherformset'], change)
"""
with deletion.protect():
self.save_formset(request, form, formset, change)
for instance in formset.deleted_objects:
related = set(related_classes(instance))
related.discard(instance.__class__)
for class_ in classes:
related.discard(class_)
if len(related):
pretty_classes = [
unicode(class_._meta.verbose_name_plural)
for class_ in related
]
if len(pretty_classes) > 1:
pretty_classes = u''.join((u', '.join(pretty_classes[:-1]),
_(' and '), pretty_classes[-1]))
else:
pretty_classes = pretty_classes[-1]
messages.error(
request,
_('Deletion of %(instance)s not allowed: <small>There are %(classes)s related to this object.</small>'
) % {
'instance': instance,
'classes': pretty_classes,
})
else:
instance.delete()
def save_formset_deletion_allowed_if_only(self, request, form, formset,
change, classes):
"""
Helper which has is most useful when used inside ``save_formsets``
To use this method properly, your model has to inherit from
``towel.deletion.Model``. This is NOT enforced. If you ignore this, the
instances will be deleted by ``formset.save()`` as is the default with
Django.
Example::
def save_formsets(self, requset, form, formsets, change):
# Allow deleting states when the cascade includes
# ``SomeModel`` instances only.
self.save_formset_deletion_allowed_if_only(
request, form, formsets['states'], change, [SomeModel])
# No special handling for other formsets
self.save_formset(request, form, formsets['otherformset'],
change=change)
"""
with deletion.protect():
self.save_formset(request, form, formset, change)
for instance in formset.deleted_objects:
related = set(related_classes(instance))
related.discard(instance.__class__)
for class_ in classes:
related.discard(class_)
if len(related):
pretty_classes = [
force_text(class_._meta.verbose_name_plural)
for class_ in related]
if len(pretty_classes) > 1:
pretty_classes = ''.join((
', '.join(pretty_classes[:-1]),
ugettext(' and '),
pretty_classes[-1],
))
else:
pretty_classes = pretty_classes[-1]
self.add_message(request, 'deletion_denied_related', {
'pretty_classes': pretty_classes})
else:
instance.delete()
def test_deletion(self):
person = Person.objects.create()
email = person.emailaddress_set.create()
self.assertEqual(EmailAddress.objects.count(), 1)
email.delete()
self.assertEqual(EmailAddress.objects.count(), 0)
email = person.emailaddress_set.create()
self.assertEqual(EmailAddress.objects.count(), 1)
with deletion.protect():
email.delete()
self.assertEqual(EmailAddress.objects.count(), 1)
email.delete()
self.assertEqual(EmailAddress.objects.count(), 0)
def save_formset_deletion_allowed_if_only(self, request, form, formset, change, classes):
"""
Helper which has is most useful when used inside ``save_formsets``
To use this method properly, your model has to inherit from
``towel.deletion.Model``. This is NOT enforced. If you ignore this, the
instances will be deleted by ``formset.save()`` as is the default with
Django.
Example::
def save_formsets(self, requset, form, formsets, change):
# Allow deleting states when the cascade includes
# ``SomeModel`` instances only.
self.save_formset_deletion_allowed_if_only(
request, form, formsets['states'], change, [SomeModel])
# No special handling for other formsets
self.save_formset(request, form, formsets['otherformset'], change)
"""
with deletion.protect():
self.save_formset(request, form, formset, change)
for instance in formset.deleted_objects:
related = set(related_classes(instance))
related.discard(instance.__class__)
for class_ in classes:
related.discard(class_)
if len(related):
pretty_classes = [unicode(class_._meta.verbose_name_plural) for class_ in related]
if len(pretty_classes) > 1:
pretty_classes = u''.join((
u', '.join(pretty_classes[:-1]),
_(' and '),
pretty_classes[-1]))
else:
pretty_classes = pretty_classes[-1]
messages.error(request, _('Deletion of %(instance)s not allowed: <small>There are %(classes)s related to this object.</small>') % {
'instance': instance,
'classes': pretty_classes,
})
else:
instance.delete()