Fixed #9804 -- Corrected the introspection of sequence names. This was causing problems when flushing tables that had many-to-many relations through an inherited table. Thanks to jdimov for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10552 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/contenttypes/generic.py

@@ -285,6 +285,7 @@ class GenericRel(ManyToManyRel):
         self.limit_choices_to = limit_choices_to or {}
         self.symmetrical = symmetrical
         self.multiple = True
+        self.through = None
 
 class BaseGenericInlineFormSet(BaseModelFormSet):
     """

django/db/backends/__init__.py

@@ -530,7 +530,10 @@ class BaseDatabaseIntrospection(object):
                         break # Only one AutoField is allowed per model, so don't bother continuing.
 
                 for f in model._meta.local_many_to_many:
-                    sequence_list.append({'table': f.m2m_db_table(), 'column': None})
+                    # If this is an m2m using an intermediate table,
+                    # we don't need to reset the sequence.
+                    if f.rel.through is None:
+                        sequence_list.append({'table': f.m2m_db_table(), 'column': None})
 
         return sequence_list
 

tests/regressiontests/m2m_through_regress/models.py

@@ -35,6 +35,22 @@ class Group(models.Model):
     def __unicode__(self):
         return self.name
 
+# A set of models that use an non-abstract inherited model as the 'through' model.
+class A(models.Model):
+    a_text = models.CharField(max_length=20)
+
+class ThroughBase(models.Model):
+    a = models.ForeignKey(A)
+    b = models.ForeignKey('B')
+
+class Through(ThroughBase):
+    extra = models.CharField(max_length=20)
+
+class B(models.Model):
+    b_text = models.CharField(max_length=20)
+    a_list = models.ManyToManyField(A, through=Through)
+
+
 __test__ = {'API_TESTS':"""
 # Create some dummy data
 >>> bob = Person.objects.create(name='Bob')
@@ -176,4 +192,8 @@ doing a join.
 >>> bob.group_set.filter(membership__price=50)
 [<Group: Roll>]
 
+## Regression test for #9804
+# Flush the database, just to make sure we can.
+>>> management.call_command('flush', verbosity=0, interactive=False)
+
 """}