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

[Carles Pina i Estany]

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

[Anonymous Patel]

https://youtu.be/lHQI9ydQlSU

Try this video it might help, it helped me for the same problem.

Raj Patel

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[Carles Pina i Estany]

Thanks very much! I've quickly watched the video... sadly the video
helps to add fields into the registration form, not in the admin section
(the, by default, /admin URL).

As a side note and for future reference anyone here: one of my attempts
on Friday was following this one:
https://gist.github.com/riklomas/511440

This uses exactly my first approach. And it works. But only because the
default models.User already has an "email" field (not displayed by
default in http://localhost:8000/admin/auth/user/add/ )

And in a "desperate" way I realised also that UserAdmin overrides
get_form and this works:
https://stackoverflow.com/questions/54262075/difference-between-add-form-and-form

I did "MyAdminForm" doing the same as Django in the UserAdmin but this
only works if the model has the field to be added (this was sad, I
realised too late that models.User has it!)

Anyway, if anyone has added a field in a model form that doesn't belong
to the model: any pointers, help, ideas are welcomed!

Thanks for any ideas!

Carles

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