I created a form class based on a model:
class MyModel(models.Model):
increasing_field = models.PositiveIntegerField()
class MyForm(forms.ModelForm):
class Meta:
model = MyModel
I created a form to change an existing MyClass instance using POST
data to populate the form:
m = MyModel.objects.get(pk=n)
f = MyForm(request.POST, instance=m)
Every time f is being updated, f.increasing_field can only be greater
than the previous value.
How do I enforce that validation?
1 way I can think is to have clean_increasing_field take on an extra
argument that represents the previous value of increasing_field:
def clean_increasing_field(self, previous_value)
...
This way I can just make sure the new value is greater than the
previous value. But it looks like clean_<fieldname>() methods cannot
take on extra arguments.
How can this validation be achieved?
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