How to override the autocomplete view for a specific model field in the Django admin?

Question

I need to override the way a Select2 widget of a particular ForeignKey is behaving in the Django (4.1) admin.

Namely, I am trying to increase the number of objects returned by the AJAX requests and defined by paginate_by in AutocompleteJsonView.

Sadly this great solution no longer works with Django 4.

How can I extend AutocompleteJsonView and somehow tell Django to use my custom view?

EDIT: my current workaround is to override get_paginator on the ModelAdmin by setting paginator.per_page to whatever value is suitable, but that doesn't answer to broader question of customising the autocomplete behaviour of Select2 widgets in the Django admin.

Graeme · Accepted Answer · 2024-02-07 22:42:35Z

Here is what I did for this after upgrading from Django 2.2 to 3.2, since autocomplete_view moved from Admin to Site.

from django.contrib.admin.views.autocomplete import AutocompleteJsonView class MySite(AdminSite): def autocomplete_view(self, request): if request.GET['model_name'] == "mymodel": return CustomAutocompleteJsonView.as_view(admin_site=self)(request) else: return super().autocomplete_view(request) class CustomAutocompleteJsonView(AutocompleteJsonView): pass # Override serialize_result, get, or get_paginator here

(That being said, it might be a better idea to implement and use a custom api instead of trying to re-use this undocumented class that could change again any time.)

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