https://docs.djangoproject.com/en/1.4/ref/contrib/admin/#adding-custom-validation-to-the-admin
Essentially, make a ModelForm exactly as you would normally, and add
logic to it.
You're going to want to change the queryset of the field(s) in question.
For example:
class ThingAdminForm(forms.ModelForm):
def __init__(self, *args, **kwargs):
super(ThingAdminForm, self).__init__(*args, **kwargs)
if self.instance:
self.fields['whatever'].queryset =
self.fields['whatever'].queryset.filter(something=something_else)
class Meta:
model = ThingForm
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