Django Admin Inline / Access parent object/instance of an Inline

admin.py

# Let's say you want to access the Collection instance for a Image in a Django Admin Inline

from django.contrib import admin
from app.models import Image, Collection


class ImageInline(admin.StackedInline):
    model = models.Image
    extra = 1

    def get_formset(self, request, obj=None, **kwargs):
        # If you want to access the Collection instance
        # register here
        self.parent_inline_obj = obj # Collection instance
        return super().get_formset(request, obj, **kwargs)