From: Radek Czajka Date: Mon, 17 Jan 2011 13:05:11 +0000 (+0100) Subject: #1011: short_html refresh after bookmedia delete X-Git-Url: https://git.mdrn.pl/wolnelektury.git/commitdiff_plain/9aa0db6d60b6b517f0efdff4e0f7e585e1d35de1?ds=inline #1011: short_html refresh after bookmedia delete --- diff --git a/apps/catalogue/models.py b/apps/catalogue/models.py index b258128ce..7e3ccfecb 100644 --- a/apps/catalogue/models.py +++ b/apps/catalogue/models.py @@ -12,6 +12,7 @@ from django.template.defaultfilters import slugify from django.utils.safestring import mark_safe from django.utils.translation import get_language from django.core.urlresolvers import reverse +from django.db.models.signals import post_save, m2m_changed, pre_delete from django.conf import settings @@ -720,6 +721,12 @@ class FileRecord(models.Model): def __unicode__(self): return "%s %s.%s" % (self.sha1, self.slug, self.type) +########### +# +# SIGNALS +# +########### + def _tags_updated_handler(sender, affected_tags, **kwargs): # reset tag global counter @@ -737,3 +744,24 @@ def _tags_updated_handler(sender, affected_tags, **kwargs): sender.book.reset_theme_counter() tags_updated.connect(_tags_updated_handler) + +def _m2m_changed_handler(sender, instance, action, reverse, pk_set, **kwargs): + """ refresh all the short_html stuff on BookMedia delete """ + if sender == Book.medias.through and reverse and action == 'pre_clear': + for book in instance.book_set.all(): + book.save() +m2m_changed.connect(_m2m_changed_handler) + +def _pre_delete_handler(sender, instance, **kwargs): + """ explicitly clear m2m, so that Books can be refreshed """ + if sender == BookMedia: + instance.book_set.clear() +pre_delete.connect(_pre_delete_handler) + +def _post_save_handler(sender, instance, **kwargs): + """ refresh all the short_html stuff on BookMedia update """ + if sender == BookMedia: + for book in instance.book_set.all(): + book.save() +post_save.connect(_post_save_handler) +