I have this:

```
class OrderForm(ModelForm):
    class Meta:
        model = Order
        exclude = ('number',)

    def __init__(self, *args, **kwargs):
        super(OrderForm, self).__init__(*args, **kwargs)
        if self.initial.get('account', None):
            self.fields['customer'].queryset = Customer.objects.filter(account=self.initial.get('account'))

    def save(self, force_insert=False, force_update=False, commit=True):
        m = super(OrderForm, self).save(commit=False)

        # my custom code was here

        if commit:
            m.save()
        return m

```

That works, except I need to set the "number" attribute of "Order" (which is required) to a certain number. I don't know how to do it. I tried adding:

```
self.fields['number'] = 50

```

inside the "save()" method, but I still get an IntegrityError when click save (obviously that's not the correct syntax but it hints at what I'm trying to do). Another problem I encountered to make matters worse is that I cannot even access the fields['number'] now because it's in the exclude Meta attribute (I don't want people to be able to edit it, or for it to be an ).

Should I be doing this in my model's "save()" method instead, or perhaps in the "**init**()"?