In [1]: from afns.apps.genericunique.models import Pony,Person

In [2]: from django.contrib.auth.models import User

In [3]: u1 = User.objects.all()[0]

In [4]: u2 = User.objects.all()[1]

In [5]: person1 = Person(user=u1)

In [6]: person1.save()

In [7]: person2 = Person(user=u2)

In [8]: person2.save()

In [9]: pony1 = Pony(purpleness=0,content_object=person1)

In [10]: pony1.save()

In [11]: pony2 = Pony(purpleness=-1,content_object=person2)

In [12]: pony2.save()

In [13]: Person.objects.all().order_by("pony__purpleness")
Out[13]: ---------------------------------------------------------------------------
<class 'django.core.exceptions.FieldError'>Traceback (most recent call last)

/home/svn/django/afns/<ipython console> in <module>()

/usr/local/python25/lib/python2.5/site-packages/IPython/Prompts.py in __call__(self, arg)
    521 
    522             # and now call a possibly user-defined print mechanism
--> 523             manipulated_val = self.display(arg)
    524 
    525             # user display hooks can change the variable to be stored in

/usr/local/python25/lib/python2.5/site-packages/IPython/Prompts.py in _display(self, arg)
    545         """
    546 
--> 547         return self.shell.hooks.result_display(arg)
    548 
    549     # Assign the default display method:

/usr/local/python25/lib/python2.5/site-packages/IPython/hooks.py in __call__(self, *args, **kw)
    132             #print "prio",prio,"cmd",cmd #dbg
    133             try:
--> 134                 ret = cmd(*args, **kw)
    135                 return ret
    136             except ipapi.TryNext, exc:

/usr/local/python25/lib/python2.5/site-packages/IPython/hooks.py in result_display(self, arg)
    160 
    161     if self.rc.pprint:
--> 162         out = pformat(arg)
    163         if '\n' in out:
    164             # So that multi-line strings line up with the left column of

/usr/local/python25/lib/python2.5/pprint.py in pformat(self, object)
    109     def pformat(self, object):
    110         sio = _StringIO()
--> 111         self._format(object, sio, 0, 0, {}, 0)
    112         return sio.getvalue()
    113 

/usr/local/python25/lib/python2.5/pprint.py in _format(self, object, stream, indent, allowance, context, level)
    127             self._readable = False
    128             return
--> 129         rep = self._repr(object, context, level - 1)
    130         typ = _type(object)
    131         sepLines = _len(rep) > (self._width - 1 - indent - allowance)

/usr/local/python25/lib/python2.5/pprint.py in _repr(self, object, context, level)
    193     def _repr(self, object, context, level):
    194         repr, readable, recursive = self.format(object, context.copy(),
--> 195                                                 self._depth, level)
    196         if not readable:
    197             self._readable = False

/usr/local/python25/lib/python2.5/pprint.py in format(self, object, context, maxlevels, level)
    205         and whether the object represents a recursive construct.
    206         """
--> 207         return _safe_repr(object, context, maxlevels, level)
    208 
    209 

/usr/local/python25/lib/python2.5/pprint.py in _safe_repr(object, context, maxlevels, level)
    290         return format % _commajoin(components), readable, recursive
    291 
--> 292     rep = repr(object)
    293     return rep, (rep and not rep.startswith('<')), False
    294 

/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/db/models/query.py in __repr__(self)

/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/db/models/query.py in __len__(self)

/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/db/models/query.py in iterator(self)

/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/db/models/sql/query.py in results_iter(self)

/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/db/models/sql/query.py in execute_sql(self, result_type)

/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/db/models/sql/query.py in as_sql(self, with_limits)

/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/db/models/sql/query.py in get_ordering(self)

/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/db/models/sql/query.py in find_ordering_name(self, name, opts, alias, default_order, already_seen)

<class 'django.core.exceptions.FieldError'>: Cannot order by many-valued field: 'pony__purpleness'