[Answered ]-Django-Admin : Override add-URL of the Foreign Key Auto-Complete "add" button / + green cross

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‘change + -‘ this is a result of render RelatedFieldWidgetWrapper
from django.contrib.admin.widgets

You can change attributes of this widget, but it is a little bit complicated.

in ModelAdmin.formfield_for_dbfield:

def formfield_for_dbfield(self, *args, **kwargs):
    widget = super.formfield_for_dbfield(self, *args, **kwargs).widget 
    if isinstance(widget, RelatedFieldWidgetWrapper):
        old_context = widget.get_context
        widget.get_context = my_function(widget.get_context, *args, **kwargs)

my function is a decorator for old function:

def my_function(func, *initargs, **initkwargs):
    def wrapped(*args, **kwargs):
        context = func(*args, **kwargs)
        your_keys_vals_to_add_in_url = 'something in form key=val&'
        context['url_params'] = f'{context['url_params']}&{your_keys_vals_to_add_in_url}'
        return context
    return wrapped

Other possibility is – to change template related_widget_wrapper.html
from django.admin.contrib.templates.admin.widgets
You can hardcoded your values there.

in ModelAdmin.formfield_for_dbfield:

def formfield_for_dbfield(self, *args, **kwargs):
    widget = super.formfield_for_dbfield(self, *args, **kwargs).widget
    if isinstance(widget, RelatedFieldWidgetWrapper):
        widget.template_name = 'path/to/your_overriden_related_widget_wrapper.html'
        widget.attrs.update('your_parameter' : 'you can use it after in template')  # this is not work right now in django

and after it in own template:

# example for change link
# this is not work right now in django
<a ... data-href-template="{{ change_related_template_url }}?{{ url_params }}&{{ attr.your_parameter|dafault:'' }}" .. >

The last part not works in Django right now. I made an issue in Django project about this possibility.

👤Maxim Danilov

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