Fixed the way symmetrical many-to-many relations are recorded in the Options class.

These types of relations don't have reverse accessor names, so that name can be
used by a normal field on the model. Fixed #7107.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@7764 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/options.py

@@ -274,14 +274,17 @@ class Options(object):
         """
         Initialises the field name -> field object mapping.
         """
-        cache = dict([(f.name, (f, m, True, False)) for f, m in
-                self.get_fields_with_model()])
-        for f, model in self.get_m2m_with_model():
-            cache[f.name] = (f, model, True, True)
+        cache = {}
+        # We intentionally handle related m2m objects first so that symmetrical
+        # m2m accessor names can be overridden, if necessary.
         for f, model in self.get_all_related_m2m_objects_with_model():
             cache[f.field.related_query_name()] = (f, model, False, True)
         for f, model in self.get_all_related_objects_with_model():
             cache[f.field.related_query_name()] = (f, model, False, False)
+        for f, model in self.get_m2m_with_model():
+            cache[f.name] = (f, model, True, True)
+        for f, model in self.get_fields_with_model():
+            cache[f.name] = (f, model, True, False)
         if self.order_with_respect_to:
             cache['_order'] = OrderWrt(), None, True, False
         if app_cache_ready():

tests/regressiontests/queries/models.py

@@ -90,6 +90,15 @@ class Number(models.Model):
     def __unicode__(self):
         return unicode(self.num)
 
+# Symmetrical m2m field with a normal field using the reverse accesor name
+# ("valid").
+class Valid(models.Model):
+    valid = models.CharField(max_length=10)
+    parent = models.ManyToManyField('self')
+
+    class Meta:
+        ordering = ['valid']
+
 # Some funky cross-linked models for testing a couple of infinite recursion
 # cases.
 class X(models.Model):
@@ -768,5 +777,9 @@ just count the number of results).
 >>> len(Tag.objects.order_by('parent__name'))
 5
 
+Bug #7107 -- this shouldn't create an infinite loop.
+>>> Valid.objects.all()
+[]
+
 """}