Ticket #3400: django-list_filter.diff

django/contrib/admin/views/main.py

@@ -8 +8 @@
 from django.core.paginator import ObjectPaginator, InvalidPage
 from django.shortcuts import get_object_or_404, render_to_response
 from django.db import models
-from django.db.models.query import handle_legacy_orderlist, QuerySet
+from django.db.models.query import handle_legacy_orderlist, QuerySet, LOOKUP_SEPARATOR
 from django.http import Http404, HttpResponse, HttpResponseRedirect
 from django.utils.html import escape
 from django.utils.text import capfirst, get_text_list
@@ -543 +543 @@
                                "admin/object_history.html"], extra_context, context_instance=template.RequestContext(request))
 history = staff_member_required(never_cache(history))
 
+class FollowForeignKey(object):
+    """
+    A class to represent a ForeignKey that spans multiple foreign keys
+    over multiple model classes.
+    """
+    def __init__(self, field, lookups):
+        # Traverse the relationships to reach the final model class.
+        for field_name in lookups[1:]:
+            model = field.rel.to
+            new_field = model._meta.get_field(field_name)
+            if not new_field.rel: break
+            field = new_field
+        self.verbose_name = field.verbose_name
+        self.rel = field.rel
+        # Rejoin the lookups using the separator so that the
+        # RelatedFilterSpec uses the correct lookup_kwarg.
+        self.name = LOOKUP_SEPARATOR.join(lookups)
+
 class ChangeList(object):
     def __init__(self, request, model):
         self.model = model
@@ -574 +592 @@
     def get_filters(self, request):
         filter_specs = []
         if self.lookup_opts.admin.list_filter and not self.opts.one_to_one_field:
-            filter_fields = [self.lookup_opts.get_field(field_name) \
-                              for field_name in self.lookup_opts.admin.list_filter]
-            for f in filter_fields:
+            for field_name in self.lookup_opts.admin.list_filter:
+                field_lookups = field_name.split(LOOKUP_SEPARATOR)
+                f = self.lookup_opts.get_field(field_lookups[0])
+                # If the field name spans multiple models, wrap the field in a
+                # FollowForeignKey.
+                if len(field_lookups) > 1 and f.rel:
+                    f = FollowForeignKey(f, field_lookups)
                 spec = FilterSpec.create(f, request, self.params, self.model)
                 if spec and spec.has_output():
                     filter_specs.append(spec)

django/core/management/validation.py

@@ -21 +21 @@
     from django.db import models, connection
     from django.db.models.loading import get_app_errors
     from django.db.models.fields.related import RelatedObject
+    from django.db.models.query import LOOKUP_SEPARATOR
 
     e = ModelErrorCollection(outfile)
 
@@ -170 +171 @@
                     e.add(opts, '"admin.list_filter", if given, must be set to a list or tuple.')
                 else:
                     for fn in opts.admin.list_filter:
+                        field_lookups = fn.split(LOOKUP_SEPARATOR)
                         try:
-                            f = opts.get_field(fn)
+                            f = opts.get_field(field_lookups[0])
+                            if len(field_lookups) > 1:
+                               if not f.rel:
+                                       e.add(opts, '"admin.list_filter" refers to %r which containts a non-related field.' % fn)
+                               for field_name in field_lookups[1:]:
+                                       model = f.rel.to
+                                       f = model._meta.get_field(field_name)
+                                       if not f.rel:
+                                               e.add(opts, '"admin.list_filter" refers to %r which containts a non-related field.' % fn)
                         except models.FieldDoesNotExist:
                             e.add(opts, '"admin.list_filter" refers to %r, which isn\'t a field.' % fn)
                 # date_hierarchy