Django display link to change form for FK in list_display or readonly_fields

admin_edit_link.py

from django.core.urlresolvers import reverse
from django.contrib.contenttypes.models import ContentType


def edit_link(field_name, short_description=None):
    """
    Displays link to change form for foreign key object.

    Use in `readonly_fields` or `list_display`::

        class BookAdmin(admin.ModelAdmin):
            readonly_fields = (edit_link('author', "Edit author"), )
    """

    def display_func(obj):
        obj = getattr(obj, field_name)
        if not obj:
            return ""
        ct = ContentType.objects.get_for_model(obj)
        link = reverse('admin:%s_%s_change' % (ct.app_label, ct.model),
                args=(obj.pk,))
        return u'<a href="%s">%s</a>' % (link, unicode(obj))

    display_func.allow_tags = True
    if short_description:
        display_func.short_description = short_description

    return display_func