how to add an extra field in an admin form (not part of the model)

Hi,

Last week I tried to do something in admin but it didn't work as I had guessed.

The simplification of what I wanted is to have an extra field in the admin
form.

What I tried to do is what I do in forms outside admin:

---------
class MyModelForm(forms.ModelForm):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.fields['extra_field'] = forms.CharField(max_length=100)

def save(self, *args, **kwargs):
# here I would like to have some code using the new extra_field
pass

class Meta:
model = MyModel
fields = ['amount', 'project']

class MyModelAdmin(admin.ModelAdmin):
form = MyModelForm
---------

The "extra_field" is not displayed in the "Add MyModel" form in the admin.

After this I tried different approaches too long to explain here (I mean, all
failed in different ways).

Does any of you expand an admin form with a new field? any idea, references,
etc. welcomed!

Thank you very much,

--
Carles Pina i Estany

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