Stopped unconditionally reversing admin model add/change URLs.

Starting with [16857] this could cause HTTP 500 errors when
`ModelAdmin.get_urls()` has been customized to the point it doesn't
provide these standard URLs.

Fixes #17333. Refs #15294.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17237 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/admin/sites.py

@@ -7,7 +7,7 @@
 from django.views.decorators.csrf import csrf_protect
 from django.db.models.base import ModelBase
 from django.core.exceptions import ImproperlyConfigured
-from django.core.urlresolvers import reverse
+from django.core.urlresolvers import reverse, NoReverseMatch
 from django.template.response import TemplateResponse
 from django.utils.safestring import mark_safe
 from django.utils.text import capfirst
@@ -342,10 +342,18 @@ def index(self, request, extra_context=None):
                     info = (app_label, model._meta.module_name)
                     model_dict = {
                         'name': capfirst(model._meta.verbose_name_plural),
-                        'admin_url': reverse('admin:%s_%s_changelist' % info, current_app=self.name),
-                        'add_url': reverse('admin:%s_%s_add' % info, current_app=self.name),
                         'perms': perms,
                     }
+                    if perms.get('change', False):
+                        try:
+                            model_dict['admin_url'] = reverse('admin:%s_%s_changelist' % info, current_app=self.name)
+                        except NoReverseMatch:
+                            pass
+                    if perms.get('add', False):
+                        try:
+                            model_dict['add_url'] = reverse('admin:%s_%s_add' % info, current_app=self.name)
+                        except NoReverseMatch:
+                            pass
                     if app_label in app_dict:
                         app_dict[app_label]['models'].append(model_dict)
                     else:
@@ -388,10 +396,18 @@ def app_index(self, request, app_label, extra_context=None):
                         info = (app_label, model._meta.module_name)
                         model_dict = {
                             'name': capfirst(model._meta.verbose_name_plural),
-                            'admin_url': reverse('admin:%s_%s_changelist' % info, current_app=self.name),
-                            'add_url': reverse('admin:%s_%s_add' % info, current_app=self.name),
                             'perms': perms,
                         }
+                        if perms.get('change', False):
+                            try:
+                                model_dict['admin_url'] = reverse('admin:%s_%s_changelist' % info, current_app=self.name)
+                            except NoReverseMatch:
+                                pass
+                        if perms.get('add', False):
+                            try:
+                                model_dict['add_url'] = reverse('admin:%s_%s_add' % info, current_app=self.name)
+                            except NoReverseMatch:
+                                pass
                         if app_dict:
                             app_dict['models'].append(model_dict),
                         else:

django/contrib/admin/templates/admin/index.html

@@ -19,19 +19,19 @@
         <caption><a href="{{ app.app_url }}" class="section">{% blocktrans with name=app.name %}{{ name }}{% endblocktrans %}</a></caption>
         {% for model in app.models %}
             <tr>
-            {% if model.perms.change %}
+            {% if model.admin_url %}
                 <th scope="row"><a href="{{ model.admin_url }}">{{ model.name }}</a></th>
             {% else %}
                 <th scope="row">{{ model.name }}</th>
             {% endif %}
 
-            {% if model.perms.add %}
+            {% if model.add_url %}
                 <td><a href="{{ model.add_url }}" class="addlink">{% trans 'Add' %}</a></td>
             {% else %}
                 <td>&nbsp;</td>
             {% endif %}
 
-            {% if model.perms.change %}
+            {% if model.admin_url %}
                 <td><a href="{{ model.admin_url }}" class="changelink">{% trans 'Change' %}</a></td>
             {% else %}
                 <td>&nbsp;</td>

tests/regressiontests/admin_views/admin.py

@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 from __future__ import absolute_import
 
-import datetime
 import tempfile
 import os
 
@@ -10,8 +9,10 @@
 from django.contrib.admin.views.main import ChangeList
 from django.core.files.storage import FileSystemStorage
 from django.core.mail import EmailMessage
+from django.conf.urls import patterns, url
 from django.db import models
 from django.forms.models import BaseModelFormSet
+from django.http import HttpResponse
 
 from .models import (Article, Chapter, Account, Media, Child, Parent, Picture,
     Widget, DooHickey, Grommet, Whatsit, FancyDoodad, Category, Link,
@@ -24,7 +25,7 @@
     CoverLetter, Story, OtherStory, Book, Promo, ChapterXtra1, Pizza, Topping,
     Album, Question, Answer, ComplexSortedPerson, PrePopulatedPostLargeSlug,
     AdminOrderedField, AdminOrderedModelMethod, AdminOrderedAdminMethod,
-    AdminOrderedCallable)
+    AdminOrderedCallable, Report)
 
 
 def callable_year(dt_value):
@@ -499,6 +500,17 @@ class AdminOrderedCallableAdmin(admin.ModelAdmin):
     ordering = ('order',)
     list_display = ('stuff', admin_ordered_callable)
 
+class ReportAdmin(admin.ModelAdmin):
+    def extra(self, request):
+        return HttpResponse()
+
+    def get_urls(self):
+        # Corner case: Don't call parent implementation
+        return patterns('',
+            url(r'^extra/$',
+                self.extra,
+                name='cable_extra'),
+        )
 
 site = admin.AdminSite(name="admin")
 site.register(Article, ArticleAdmin)
@@ -543,6 +555,7 @@ class AdminOrderedCallableAdmin(admin.ModelAdmin):
 site.register(CoverLetter, CoverLetterAdmin)
 site.register(Story, StoryAdmin)
 site.register(OtherStory, OtherStoryAdmin)
+site.register(Report, ReportAdmin)
 
 # We intentionally register Promo and ChapterXtra1 but not Chapter nor ChapterXtra2.
 # That way we cover all four cases:

tests/regressiontests/admin_views/models.py

@@ -566,3 +566,9 @@ class AdminOrderedAdminMethod(models.Model):
 class AdminOrderedCallable(models.Model):
     order = models.IntegerField()
     stuff = models.CharField(max_length=200)
+
+class Report(models.Model):
+    title = models.CharField(max_length=100)
+
+    def __unicode__(self):
+        return self.title

tests/regressiontests/admin_views/tests.py

@@ -38,7 +38,8 @@
     Book, Promo, WorkHour, Employee, Question, Answer, Inquisition, Actor,
     FoodDelivery, RowLevelChangePermissionModel, Paper, CoverLetter, Story,
     OtherStory, ComplexSortedPerson, Parent, Child, AdminOrderedField,
-    AdminOrderedModelMethod, AdminOrderedAdminMethod, AdminOrderedCallable)
+    AdminOrderedModelMethod, AdminOrderedAdminMethod, AdminOrderedCallable,
+    Report)
 
 
 ERROR_MESSAGE = "Please enter the correct username and password \
@@ -1090,6 +1091,37 @@ def testDisabledPermissionsWhenLoggedIn(self):
         self.assertContains(response, 'id="login-form"')
 
 
+class AdminViewsNoUrlTest(TestCase):
+    """Regression test for #17333"""
+
+    urls = "regressiontests.admin_views.urls"
+    fixtures = ['admin-views-users.xml']
+
+    def setUp(self):
+        opts = Report._meta
+        # User who can change Reports
+        change_user = User.objects.get(username='changeuser')
+        change_user.user_permissions.add(get_perm(Report,
+            opts.get_change_permission()))
+
+        # login POST dict
+        self.changeuser_login = {
+            REDIRECT_FIELD_NAME: '/test_admin/admin/',
+            LOGIN_FORM_KEY: 1,
+            'username': 'changeuser',
+            'password': 'secret',
+        }
+
+    def test_no_standard_modeladmin_urls(self):
+        """Admin index views don't break when user's ModelAdmin removes standard urls"""
+        self.client.get('/test_admin/admin/')
+        self.client.post('/test_admin/admin/', self.changeuser_login)
+        r = self.client.get('/test_admin/admin/')
+        # we shouldn' get an 500 error caused by a NoReverseMatch
+        self.assertEqual(r.status_code, 200)
+        self.client.get('/test_admin/admin/logout/')
+
+
 class AdminViewDeletedObjectsTest(TestCase):
     urls = "regressiontests.admin_views.urls"
     fixtures = ['admin-views-users.xml', 'deleted-objects.xml']