diff --git a/django/conf/urls/admin.py b/django/conf/urls/admin.py
index dbe30940d6..841d50523e 100644
--- a/django/conf/urls/admin.py
+++ b/django/conf/urls/admin.py
@@ -50,9 +50,9 @@ urlpatterns += (
     # Metasystem admin pages
     ('^(?P<app_label>[^/]+)/(?P<module_name>[^/]+)/$', 'django.views.admin.main.change_list'),
     ('^(?P<app_label>[^/]+)/(?P<module_name>[^/]+)/add/$', 'django.views.admin.main.add_stage'),
-    ('^(?P<app_label>[^/]+)/(?P<module_name>[^/]+)/(?P<object_id>\d+)/$', 'django.views.admin.main.change_stage'),
-    ('^(?P<app_label>[^/]+)/(?P<module_name>[^/]+)/(?P<object_id>\d+)/delete/$', 'django.views.admin.main.delete_stage'),
-    ('^(?P<app_label>[^/]+)/(?P<module_name>[^/]+)/(?P<object_id>\d+)/history/$', 'django.views.admin.main.history'),
     ('^(?P<app_label>[^/]+)/(?P<module_name>[^/]+)/jsvalidation/$', 'django.views.admin.jsvalidation.jsvalidation'),
+    ('^(?P<app_label>[^/]+)/(?P<module_name>[^/]+)/(?P<object_id>.+)/history/$', 'django.views.admin.main.history'),
+    ('^(?P<app_label>[^/]+)/(?P<module_name>[^/]+)/(?P<object_id>.+)/delete/$', 'django.views.admin.main.delete_stage'),
+    ('^(?P<app_label>[^/]+)/(?P<module_name>[^/]+)/(?P<object_id>.+)/$', 'django.views.admin.main.change_stage'),
 )
 urlpatterns = patterns('', *urlpatterns)
diff --git a/django/core/meta/__init__.py b/django/core/meta/__init__.py
index 99abbd728c..554ba4eda0 100644
--- a/django/core/meta/__init__.py
+++ b/django/core/meta/__init__.py
@@ -1338,7 +1338,7 @@ def manipulator_init(opts, add, change, self, obj_key=None):
         assert obj_key is not None, "ChangeManipulator.__init__() must be passed obj_key parameter."
         self.obj_key = obj_key
         try:
-            self.original_object = opts.get_model_module().get_object(**{'%s__exact' % opts.pk.name: obj_key})
+            self.original_object = opts.get_model_module().get_object(pk=obj_key)
         except ObjectDoesNotExist:
             # If the object doesn't exist, this might be a manipulator for a
             # one-to-one related object that hasn't created its subobject yet.
@@ -1358,7 +1358,7 @@ def manipulator_init(opts, add, change, self, obj_key=None):
                 raise
     self.fields = []
     for f in opts.fields + opts.many_to_many:
-        if f.editable and (not f.rel or not f.rel.edit_inline):
+        if f.editable and not (f.primary_key and change) and (not f.rel or not f.rel.edit_inline):
             self.fields.extend(f.get_manipulator_fields(opts, self, change))
 
     # Add fields for related objects.
diff --git a/django/core/meta/fields.py b/django/core/meta/fields.py
index 46e317dca4..adbfe4ca92 100644
--- a/django/core/meta/fields.py
+++ b/django/core/meta/fields.py
@@ -179,7 +179,7 @@ class Field(object):
             params['validator_list'].append(getattr(manipulator, 'isUnique%sFor%s' % (self.name, self.unique_for_month)))
         if self.unique_for_year:
             params['validator_list'].append(getattr(manipulator, 'isUnique%sFor%s' % (self.name, self.unique_for_year)))
-        if self.unique:
+        if self.unique or (self.primary_key and not rel):
             params['validator_list'].append(curry(manipulator_validator_unique, self, opts, manipulator))
 
         # Only add is_required=True if the field cannot be blank. Primary keys
diff --git a/django/models/auth.py b/django/models/auth.py
index 0b6d01069e..91ed0650ec 100644
--- a/django/models/auth.py
+++ b/django/models/auth.py
@@ -247,7 +247,7 @@ class LogEntry(meta.Model):
         meta.DateTimeField('action_time', auto_now=True),
         meta.ForeignKey(User),
         meta.ForeignKey(core.ContentType, name='content_type_id', rel_name='content_type', blank=True, null=True),
-        meta.IntegerField('object_id', blank=True, null=True),
+        meta.TextField('object_id', blank=True, null=True),
         meta.CharField('object_repr', maxlength=200),
         meta.PositiveSmallIntegerField('action_flag'),
         meta.TextField('change_message', blank=True),
diff --git a/django/views/admin/main.py b/django/views/admin/main.py
index 210523a8bb..430ae15744 100644
--- a/django/views/admin/main.py
+++ b/django/views/admin/main.py
@@ -719,6 +719,8 @@ def _get_admin_field(field_list, name_prefix, rel, add, change):
                 class_names.append('inline')
             t.append('<label for="%s"%s>%s:</label> ' % (label_name, class_names and ' class="%s"' % ' '.join(class_names) or '', capfirst(field.verbose_name)))
             t.append(_get_admin_field_form_widget(field, name_prefix, rel, add, change))
+        if change and field.primary_key:
+            t.append('{{ %soriginal.%s }}' % ((rel and name_prefix or ''), field.name))
         if change and use_raw_id_admin(field):
             obj_repr = '%soriginal.get_%s|truncatewords:"14"' % (rel and name_prefix or '', field.rel.name)
             t.append('{%% if %s %%}&nbsp;<strong>{{ %s }}</strong>{%% endif %%}' % (obj_repr, obj_repr))