how to access modeladmin class instance from an inline class instance in django admin

Question

I am collecting current instance of a modeladmin class from url in admin.py as shown below. But now if I try to create a new form, it throws error because the url does not contain any id. How do I work around it in a django way? How do I get current instance of a modeladmin class in an inline class instance?

Below is my code in the inline class that throws error.

def get_object(self, request, model):
    object_id = resolve(request.path).args[0]   #throws index error when 'add new form is clicked'
    try:
        object_id = int(object_id)
    except ValueError:
        return None
    return model.objects.get(pk=object_id)

I fixed this by adding a try and except block for IndexError. I still do not know how to access modeladmin instance from inline class instance. — ac11
– ac11, Commented Oct 22, 2015 at 21:27

Luismejiadev · Accepted Answer · 2016-09-23 16:34:37Z

3

When you register the AdminClass in the admin_site, Django instantiate the admin class to save in the registry ( a dict), where the key is the ModelClass, and the value is the ModelAdminClass instance,

From Inline Instance you can access to the parent_model, and then search in the registy

def get_object(self, request, model):
    ...
    admin_site._registry[self.parent_model]

answered Sep 23, 2016 at 16:34

Luismejiadev

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2 Comments

ppython Over a year ago

Excellent way, or admin.site._registryin my case!

AndyC Over a year ago

How to access attribute of parent model from inline? I am trying to check values using clean from inline formset or inline form.

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