admin.py

from django.contrib.auth.models import Group, User
from django.contrib.auth.admin import GroupAdmin, UserAdmin
from django.contrib import admin
from django.urls import path
from .models import Appointment
from .models import DayConfiguration
from . import views

from django.http import HttpResponse
import logging
import csv

logger = logging.getLogger(__name__)

class ExportCsvMixin:
    def export_as_csv(self, request, queryset):

        meta = self.model._meta
        field_names = [field.name for field in meta.fields]

        response = HttpResponse(content_type='text/csv')
        response['Content-Disposition'] = 'attachment; filename={}.csv'.format(meta)
        writer = csv.writer(response)

        writer.writerow(field_names)
        for obj in queryset:
            row = writer.writerow([getattr(obj, field) for field in field_names])

        return response

    export_as_csv.short_description = "Export Selected"

class AppointmentAdmin(admin.ModelAdmin, ExportCsvMixin):
    list_display = ("Datetime", "Created_at", "private_contact")
    actions = ["export_as_csv"]

class MikvahAdmin(admin.AdminSite):
    site_title = "Mikvah Admin"
    site_header = "Mikvah Admin"
    site_url = "/mikvah/admin/attendant/"

    def get_urls(self):
        urls = super(MikvahAdmin, self).get_urls()
        my_urls = [path("attendant/", self.admin_view(views.attendant), name="attendant"),]
        #logger.info(my_urls + urls)
        return my_urls + urls

admin_site = MikvahAdmin(name='mikvah_admin')
admin_site.register(Appointment, AppointmentAdmin)
admin_site.register(DayConfiguration)
admin_site.register(Group, GroupAdmin)
admin_site.register(User, UserAdmin)