Django-Admin : OveOrride add-URL of the Foreign Key Auto-Complete "add" button / + green cross

[luigim...@gmail.com]

Hello Community, 

Goal : adding a parameter to the add_url embedded by the green cross of a foreignkey field in the django-admin details view.

Solution : pass my parameter as a widget attrs through the formfield_for_dbfield method and override the admin template : see code paste_bin

Issue : 

- Template gets overriden

- I can't access attrs.my_parameter or attr.my_parameter. It remains empty. 

Am I doing something wrong? Is it a bug ? 

Best, 

Louis