Admin add form with default values

Question

To add a simple type of copy functionality to the Django admin I would like to render the default admin add form of a model but with default values. I know that the add form accepts GET parameters to pre-populate most fields, but I don't always want to copy M2M references, sometimes the referenced objects also need to be copied.

What I would like to do in code:

def some_view(self, request, pk):
    modeol_original = FooModel.objects.get(pk)
    model_copy = FooModel()
    copy_attributes_custom(model_original, model_copy)
    return render_default_django_add_page_for_model(model_copy)

As dhana mentioned in the comments, this is possible as seen in: Django set default form values but only for custom templates. I wan't to use the default Django Admin add form/template.

May be duplicate http://stackoverflow.com/questions/604266/django-set-default-form-values — dhana, May 06 '14 at 08:45
The Django admin doesn't easily allow you to copy a model instance. You'll have to create a custom admin view that does that. — schillingt, May 07 '14 at 03:30
But then how can I render the default add/edit form for an unsaved model instance in that custom view? — zeebonk, May 07 '14 at 09:18

score 0 · Accepted Answer · answered Jun 13 '14 at 13:26

Altough I haven't been able to do exactly what I want, I've sort of solved my problem by creating a custom admin action that copies all selected models in a way that is logical for the type of model. By overwriting certain properties and setting a "invalid" status, the user is forced to first edit the copied model before it can be used.

Admin add form with default values

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