#25537: Model objects not showing after changing M2M to ForeinKey
-------------------------------+--------------------------------------
     Reporter:  yaniv14        |                    Owner:  nobody
         Type:  Bug            |                   Status:  new
    Component:  contrib.admin  |                  Version:  1.8
     Severity:  Normal         |               Resolution:
     Keywords:                 |             Triage Stage:  Unreviewed
    Has patch:  0              |      Needs documentation:  0
  Needs tests:  0              |  Patch needs improvement:  0
Easy pickings:  0              |                    UI/UX:  0
-------------------------------+--------------------------------------

Comment (by yaniv14):

 First I had this in my models.py
 {{{
 #!python
 class MenuTime(models.Model):
     title = models.CharField(_('Title'), max_length=200)
     order = models.PositiveSmallIntegerField(_('Order'), default=1)

     class Meta:
         verbose_name = _('Menu time')
         verbose_name_plural = _('Menu times')
         ordering = ['order', ]

     def __unicode__(self):
         return self.title


 class MenuGroup(models.Model):
     title = models.CharField(_('Title'), max_length=200)

     class Meta:
         verbose_name = _('Menu group')
         verbose_name_plural = _('Menu groups')

     def __unicode__(self):
         return self.title


 class HealthQuestionnaire(models.Model):
     title = models.CharField(_('Name'), max_length=200)

     class Meta:
         verbose_name = _('Health questionnaire')
         verbose_name_plural = _('Health questionnaires')

     def __unicode__(self):
         return self.title


 class MenuItem(models.Model):
     name = models.CharField(_('Name'), max_length=200)
     time = models.ManyToManyField(MenuTime, related_name='menu_items')
     group = models.ForeignKey(MenuGroup, related_name='menu_items')
     male = models.BooleanField(_('For male?'), default=True)
     female = models.BooleanField(_('For female?'), default=True)
     image = ImageField(upload_to='menus', verbose_name=_("Menu image"),
 blank=True, null=True)
     not_allowed = models.ManyToManyField(HealthQuestionnaire,
 verbose_name=_("Not allowed with"),
                                          related_name='menu_items',
 blank=True)

     class Meta:
         verbose_name = _('Menu item')
         verbose_name_plural = _('Menu items')
         ordering = ['-name']

     def __unicode__(self):
         return self.name

     def admin_thumbnail(self):
         return u'<img src="%s" width="120" height="auto" />' %
 self.image.url if self.image else None

     admin_thumbnail.short_description = _('Thumbnail')
     admin_thumbnail.allow_tags = True

     def not_allowed_list(self):
         return ", ".join([x.title for x in self.not_allowed.all()])

     not_allowed_list.short_description = _('Not allowed list')
 }}}
 And I had 11 MenuItem objects created from django admin, later I decided
 to change the relation of time field from M2M to ForeignKey -> "time =
 models.ForeignKey(MenuTime, related_name='menu_items', null=True)"

 I ran manage.py makemigration and migrate and then I've started to notice
 the issue.
 All 11 objects are still accessible and the bug I have is only in the
 django admin list display.
 If i am adding to the url the object ID
 (127.0.0.1:8000/admin14/core/menuitem/2/) I am able to see the correct
 object in the admin panel.

 Hope it helps to reproduce the bug

--
Ticket URL: <https://code.djangoproject.com/ticket/25537#comment:2>
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