Fixed #11108 -- added ModelAdmin.delete_model, a hook with which to p…

…erform custom pre-post delete behavior. Thanks to Florian Apolloner for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@14673 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/admin/options.py

@@ -601,6 +601,12 @@ def save_model(self, request, obj, form, change):
         """
         obj.save()
 
+    def delete_model(self, requet, obj):
+        """
+        Given a model instance delete it from the database.
+        """
+        obj.delete()
+
     def save_formset(self, request, form, formset, change):
         """
         Given an inline formset save it to the database.
@@ -1122,7 +1128,7 @@ def delete_view(self, request, object_id, extra_context=None):
                 raise PermissionDenied
             obj_display = force_unicode(obj)
             self.log_deletion(request, obj, obj_display)
-            obj.delete()
+            self.delete_model(request, obj)
 
             self.message_user(request, _('The %(name)s "%(obj)s" was deleted successfully.') % {'name': force_unicode(opts.verbose_name), 'obj': force_unicode(obj_display)})
 

docs/ref/contrib/admin/index.txt

@@ -757,6 +757,12 @@ templates used by the :class:`ModelAdmin` views:
 ``ModelAdmin`` methods
 ----------------------
 
+.. warning::
+
+    :meth:`ModelAdmin.save_model` and :meth:`ModelAdmin.delete_model` must
+    save/delete the object, they are not for veto purposes, rather they allow
+    you to perform extra operations.
+
 .. method:: ModelAdmin.save_model(self, request, obj, form, change)
 
 The ``save_model`` method is given the ``HttpRequest``, a model instance,
@@ -770,6 +776,13 @@ For example to attach ``request.user`` to the object prior to saving::
             obj.user = request.user
             obj.save()
 
+.. method:: ModelAdmin.delete_model(self, request, obj)
+
+.. versionadded:: 1.3
+
+The ``delete_model`` method is given the ``HttpRequest`` and a model instance.
+Use this method to do pre- or post-delete operations.
+
 .. method:: ModelAdmin.save_formset(self, request, form, formset, change)
 
 The ``save_formset`` method is given the ``HttpRequest``, the parent

docs/topics/db/multi-db.txt

@@ -458,7 +458,7 @@ database other than that that specified by your router chain, you'll
 need to write custom :class:`~django.contrib.admin.ModelAdmin` classes
 that will direct the admin to use a specific database for content.
 
-``ModelAdmin`` objects have four methods that require customization for
+``ModelAdmin`` objects have five methods that require customization for
 multiple-database support::
 
     class MultiDBModelAdmin(admin.ModelAdmin):
@@ -469,6 +469,10 @@ multiple-database support::
             # Tell Django to save objects to the 'other' database.
             obj.save(using=self.using)
 
+        def delete_model(self, requqest, obj):
+            # Tell Django to delete objects from the 'other' database
+            obj.delete(using=self.using)
+
         def queryset(self, request):
             # Tell Django to look for objects on the 'other' database.
             return super(MultiDBModelAdmin, self).queryset(request).using(self.using)

tests/regressiontests/admin_views/models.py

@@ -107,6 +107,25 @@ def modeladmin_year(self, obj):
     modeladmin_year.admin_order_field = 'date'
     modeladmin_year.short_description = None
 
+    def delete_model(self, request, obj):
+        EmailMessage(
+            'Greetings from a deleted object',
+            'I hereby inform you that some user deleted me',
+            'from@example.com',
+            ['to@example.com']
+        ).send()
+        return super(ArticleAdmin, self).delete_model(request, obj)
+
+    def save_model(self, request, obj, form, change=True):
+        EmailMessage(
+            'Greetings from a created object',
+            'I hereby inform you that some user created me',
+            'from@example.com',
+            ['to@example.com']
+        ).send()
+        return super(ArticleAdmin, self).save_model(request, obj, form, change)
+
+
 class CustomArticle(models.Model):
     content = models.TextField()
     date = models.DateTimeField()

tests/regressiontests/admin_views/tests.py

@@ -3,6 +3,7 @@
 import re
 import datetime
 from django.conf import settings
+from django.core import mail
 from django.core.files import temp as tempfile
 from django.contrib.auth import admin # Register auth models with the admin.
 from django.contrib.auth.models import User, Permission, UNUSABLE_PASSWORD
@@ -540,6 +541,8 @@ def testAddView(self):
         post = self.client.post('/test_admin/admin/admin_views/article/add/', add_dict)
         self.assertRedirects(post, '/test_admin/admin/')
         self.failUnlessEqual(Article.objects.all().count(), 4)
+        self.assertEquals(len(mail.outbox), 1)
+        self.assertEquals(mail.outbox[0].subject, 'Greetings from a created object')
         self.client.get('/test_admin/admin/logout/')
 
         # Super can add too, but is redirected to the change list view
@@ -695,6 +698,8 @@ def testDeleteView(self):
         post = self.client.post('/test_admin/admin/admin_views/article/1/delete/', delete_dict)
         self.assertRedirects(post, '/test_admin/admin/')
         self.failUnlessEqual(Article.objects.all().count(), 2)
+        self.assertEquals(len(mail.outbox), 1)
+        self.assertEquals(mail.outbox[0].subject, 'Greetings from a deleted object')
         article_ct = ContentType.objects.get_for_model(Article)
         logged = LogEntry.objects.get(content_type=article_ct, action_flag=DELETION)
         self.failUnlessEqual(logged.object_id, u'1')
@@ -1440,8 +1445,6 @@ def testInline(self):
         self.failUnlessEqual(BarAccount.objects.all()[0].username, "%s-1" % bar_user)
         self.failUnlessEqual(Persona.objects.all()[0].accounts.count(), 2)
 
-from django.core import mail
-
 class AdminActionsTest(TestCase):
     fixtures = ['admin-views-users.xml', 'admin-views-actions.xml']