Fixed #12875 -- Added get_ordering to ModelAdmin. Many thanks to Manuel Saelices.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16383 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/admin/options.py

@@ -189,6 +189,12 @@ class BaseModelAdmin(object):
         return None
     declared_fieldsets = property(_declared_fieldsets)
 
+    def get_ordering(self, request):
+        """
+        Hook for specifying field ordering.
+        """
+        return self.ordering or ()  # otherwise we might try to *None, which is bad ;)
+
     def get_readonly_fields(self, request, obj=None):
         """
         Hook for specifying custom readonly fields.
@@ -208,7 +214,7 @@ class BaseModelAdmin(object):
         """
         qs = self.model._default_manager.get_query_set()
         # TODO: this should be handled by some parameter to the ChangeList.
-        ordering = self.ordering or () # otherwise we might try to *None, which is bad ;)
+        ordering = self.get_ordering(request)
         if ordering:
             qs = qs.order_by(*ordering)
         return qs
@@ -260,6 +266,7 @@ class BaseModelAdmin(object):
             clean_lookup = LOOKUP_SEP.join(parts)
             return clean_lookup in self.list_filter or clean_lookup == self.date_hierarchy
 
+
 class ModelAdmin(BaseModelAdmin):
     "Encapsulates all admin options and functionality for a given model."
 

django/contrib/admin/views/main.py

@@ -76,7 +76,7 @@ class ChangeList(object):
             self.list_editable = ()
         else:
             self.list_editable = list_editable
-        self.ordering = self.get_ordering()
+        self.ordering = self.get_ordering(request)
         self.query = request.GET.get(SEARCH_VAR, '')
         self.query_set = self.get_query_set(request)
         self.get_results(request)
@@ -172,12 +172,13 @@ class ChangeList(object):
             ordering = self.lookup_opts.ordering
         return ordering
 
-    def get_ordering(self):
+    def get_ordering(self, request):
         params = self.params
-        # For ordering, first check the "ordering" parameter in the admin
+        # For ordering, first check the if exists the "get_ordering" method
+        # in model admin, then check "ordering" parameter in the admin
         # options, then check the object's default ordering. Finally, a
         # manually-specified ordering from the query string overrides anything.
-        ordering = self._get_default_ordering()
+        ordering = self.model_admin.get_ordering(request) or self._get_default_ordering()
 
         if ORDER_VAR in params:
             # Clear ordering and used params

docs/ref/contrib/admin/index.txt

@@ -704,6 +704,11 @@ subclass::
     If this isn't provided, the Django admin will use the model's default
     ordering.
 
+    .. versionadded:: 1.4
+
+    If you need to specify a dynamic order (for example depending on user or
+    language) you can implement a :meth:`~ModelAdmin.get_ordering` method.
+
     .. versionchanged:: 1.4
 
     Django honors all elements in the list/tuple; before 1.4, only the first
@@ -957,6 +962,22 @@ templates used by the :class:`ModelAdmin` views:
                     instance.save()
                 formset.save_m2m()
 
+.. method:: ModelAdmin.get_ordering(self, request)
+
+    .. versionadded:: 1.4
+
+    The ``get_ordering`` method takes a``request`` as parameter and
+    is expected to return a ``list`` or ``tuple`` for ordering similiar
+    to the :attr:`ordering` attribute. For example::
+
+        class PersonAdmin(ModelAdmin):
+
+            def get_ordering(self, request):
+                if request.user.is_superuser:
+                    return ['name', 'rank']
+                else:
+                    return ['name']
+
 .. method:: ModelAdmin.get_readonly_fields(self, request, obj=None)
 
     .. versionadded:: 1.2
@@ -1053,7 +1074,7 @@ templates used by the :class:`ModelAdmin` views:
 .. method:: ModelAdmin.formfield_for_foreignkey(self, db_field, request, **kwargs)
 
     The ``formfield_for_foreignkey`` method on a ``ModelAdmin`` allows you to
-    override the default formfield for a foreign key field. For example, to
+    override the default formfield for a foreign keys field. For example, to
     return a subset of objects for this foreign key field based on the user::
 
         class MyModelAdmin(admin.ModelAdmin):

docs/releases/1.4.txt

@@ -73,10 +73,12 @@ documentation for :attr:`~django.contrib.admin.ModelAdmin.list_filter`.
 Multiple sort in admin interface
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-The admin change list now supports sorting on multiple columns. It respects all
-elements of the :attr:`~django.contrib.admin.ModelAdmin.ordering` attribute, and
-sorting on multiple columns by clicking on headers is designed to work similarly
-to how desktop GUIs do it.
+The admin change list now supports sorting on multiple columns. It respects
+all elements of the :attr:`~django.contrib.admin.ModelAdmin.ordering`
+attribute, and sorting on multiple columns by clicking on headers is designed
+to work similarly to how desktop GUIs do it. The new hook
+:meth:`~django.contrib.admin.ModelAdmin.get_ordering` for specifying the
+ordering dynamically (e.g. depending on the request) has also been added.
 
 Tools for cryptographic signing
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

tests/regressiontests/admin_ordering/models.py

@@ -24,3 +24,11 @@ class SongInlineDefaultOrdering(admin.StackedInline):
 class SongInlineNewOrdering(admin.StackedInline):
     model = Song
     ordering = ('duration', )
+
+class DynOrderingBandAdmin(admin.ModelAdmin):
+
+    def get_ordering(self, request):
+        if request.user.is_superuser:
+            return ['rank']
+        else:
+            return ['name']

tests/regressiontests/admin_ordering/tests.py

@@ -1,7 +1,8 @@
-from django.test import TestCase
+from django.test import TestCase, RequestFactory
+from django.contrib.auth.models import User
 from django.contrib.admin.options import ModelAdmin
 
-from models import Band, Song, SongInlineDefaultOrdering, SongInlineNewOrdering
+from models import Band, Song, SongInlineDefaultOrdering, SongInlineNewOrdering, DynOrderingBandAdmin
 
 class TestAdminOrdering(TestCase):
     """
@@ -11,6 +12,7 @@ class TestAdminOrdering(TestCase):
     """
 
     def setUp(self):
+        self.request_factory = RequestFactory()
         b1 = Band(name='Aerosmith', bio='', rank=3)
         b1.save()
         b2 = Band(name='Radiohead', bio='', rank=1)
@@ -38,6 +40,22 @@ class TestAdminOrdering(TestCase):
         names = [b.name for b in ma.queryset(None)]
         self.assertEqual([u'Radiohead', u'Van Halen', u'Aerosmith'], names)
 
+    def test_dynamic_ordering(self):
+        """
+        Let's use a custom ModelAdmin that changes the ordering dinamically.
+        """
+        super_user = User.objects.create(username='admin', is_superuser=True)
+        other_user = User.objects.create(username='other')
+        request = self.request_factory.get('/')
+        request.user = super_user
+        ma = DynOrderingBandAdmin(Band, None)
+        names = [b.name for b in ma.queryset(request)]
+        self.assertEqual([u'Radiohead', u'Van Halen', u'Aerosmith'], names)
+        request.user = other_user
+        names = [b.name for b in ma.queryset(request)]
+        self.assertEqual([u'Aerosmith', u'Radiohead', u'Van Halen'], names)
+
+
 class TestInlineModelAdminOrdering(TestCase):
     """
     Let's make sure that InlineModelAdmin.queryset uses the ordering we define