Fixed #13902 -- Fixed admin list_filter so it doesn't show duplicate results when it includes a field spec that involves m2m relationships with an intermediate model. Thanks Iván Raskovsky for the report and patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15526 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/admin_changelist/models.py

@@ -1,5 +1,4 @@
 from django.db import models
-from django.contrib import admin
 
 class Parent(models.Model):
     name = models.CharField(max_length=128)
@@ -7,3 +6,44 @@ class Parent(models.Model):
 class Child(models.Model):
     parent = models.ForeignKey(Parent, editable=False, null=True)
     name = models.CharField(max_length=30, blank=True)
+
+class Genre(models.Model):
+    name = models.CharField(max_length=20)
+
+class Band(models.Model):
+    name = models.CharField(max_length=20)
+    nr_of_members = models.PositiveIntegerField()
+    genres = models.ManyToManyField(Genre)
+
+class Musician(models.Model):
+    name = models.CharField(max_length=30)
+
+    def __unicode__(self):
+        return self.name
+
+class Group(models.Model):
+    name = models.CharField(max_length=30)
+    members = models.ManyToManyField(Musician, through='Membership')
+
+    def __unicode__(self):
+        return self.name
+
+class Membership(models.Model):
+    music = models.ForeignKey(Musician)
+    group = models.ForeignKey(Group)
+    role = models.CharField(max_length=15)
+
+class Quartet(Group):
+    pass
+
+class ChordsMusician(Musician):
+    pass
+
+class ChordsBand(models.Model):
+    name = models.CharField(max_length=30)
+    members = models.ManyToManyField(ChordsMusician, through='Invitation')
+
+class Invitation(models.Model):
+    player = models.ForeignKey(ChordsMusician)
+    band = models.ForeignKey(ChordsBand)
+    instrument = models.CharField(max_length=15)