################################################################
# models.py

class Post(models.Model):
    author = models.ForeignKey(CustomUserModel)
    title = models.CharField(max_length=200)
    # TextField for lots of text.
    # yeah, max len is used only for input widget
    text = models.TextField(max_length=15000)
    is_published = models.BooleanField(default=False)  # maybe add default?


################################################################
# views.py

# function view :(
def unpublish_posts(request):
    ids = request.POST.get('ids').split(',')
    # dunno if django is ok with filter list containing unstripped int-strings
    ids = [int(id_) for id_ in ids]

    unpublish_qs = Post.objects.filter(pk__in=ids, is_published=True)

    if not unpublish_qs.count():
        return HttpResponse()

    unpublish_qs.update(is_published=False)

    # not tested but something like that should work
    notify_emails = (
        unpublish_qs.distinct('author__email')
        .values_list('author__email', flat=True)
    )

    send_email(
        'Notification',
        f'Your one or more articles has been unpublished!',
        settings.EMAIL_DEFAULT_SENDER,
        notify_emails,
        fail_silently=False,
    )

    # probably we shoud return any resp, not None
    return HttpResponse()

        # WTF
        # else:
        #     post.is_published = True
        #     post.save()