David,
for me, these two links did the trick:
http://docs.djangoproject.com/en/dev/ref/contrib/admin/#adding-custom-validation-to-the-admin
http://docs.djangoproject.com/en/dev/ref/forms/validation/#ref-forms-validation
However, validation as described in the Django docs does not happen in
the model's save method; it happens in the admin form. Above links
explain how to tell the admin layer to use your form class which
provides its own validation method. So you could alter the second
database in the validation method and raise a ValidationError if it
fails.
For example:
models.py:
class MyModel(models.Model):
[...]
class MyModelAdminForm(forms.ModelForm):
class Meta:
model = MyModel
def clean(self):
data = self.cleaned_data
try:
# alter other DB here
if x > y:
raise forms.ValidationError(_("X must not be greater than y!"))
return data
admin.py:
class MyModelAdmin(admin.ModelAdmin):
form = MyModelAdminForm
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