TandoorRecipes/cookbook/signals.py
2021-12-28 12:03:31 -06:00

81 lines
3.3 KiB
Python

from functools import wraps
from django.contrib.postgres.search import SearchVector
from django.db.models.signals import post_save
from django.dispatch import receiver
from django.utils import translation
from cookbook.managers import DICTIONARY
from cookbook.models import Food, FoodInheritField, Recipe, Step
# wraps a signal with the ability to set 'skip_signal' to avoid creating recursive signals
def skip_signal(signal_func):
@wraps(signal_func)
def _decorator(sender, instance, **kwargs):
if not instance:
return None
if hasattr(instance, 'skip_signal'):
return None
return signal_func(sender, instance, **kwargs)
return _decorator
# TODO there is probably a way to generalize this
@receiver(post_save, sender=Recipe)
@skip_signal
def update_recipe_search_vector(sender, instance=None, created=False, **kwargs):
language = DICTIONARY.get(translation.get_language(), 'simple')
instance.name_search_vector = SearchVector('name__unaccent', weight='A', config=language)
instance.desc_search_vector = SearchVector('description__unaccent', weight='C', config=language)
try:
instance.skip_signal = True
instance.save()
finally:
del instance.skip_signal
@receiver(post_save, sender=Step)
@skip_signal
def update_step_search_vector(sender, instance=None, created=False, **kwargs):
language = DICTIONARY.get(translation.get_language(), 'simple')
instance.search_vector = SearchVector('instruction__unaccent', weight='B', config=language)
try:
instance.skip_signal = True
instance.save()
finally:
del instance.skip_signal
@receiver(post_save, sender=Food)
@skip_signal
def update_food_inheritance(sender, instance=None, created=False, **kwargs):
if not instance:
return
inherit = Food.inherit_fields.difference(instance.ignore_inherit.all())
# nothing to apply from parent and nothing to apply to children
if (not instance.inherit or not instance.parent or inherit.count() == 0) and instance.numchild == 0:
return
inherit = inherit.values_list('field', flat=True)
# apply changes from parent to instance for each inheritted field
if instance.inherit and instance.parent and inherit.count() > 0:
parent = instance.get_parent()
if 'ignore_shopping' in inherit:
instance.ignore_shopping = parent.ignore_shopping
# if supermarket_category is not set, do not cascade - if this becomes non-intuitive can change
if 'supermarket_category' in inherit and parent.supermarket_category:
instance.supermarket_category = parent.supermarket_category
try:
instance.skip_signal = True
instance.save()
finally:
del instance.skip_signal
# apply changes to direct children - depend on save signals for those objects to cascade inheritance down
instance.get_children().filter(inherit=True).exclude(ignore_inherit__field='ignore_shopping').update(ignore_shopping=instance.ignore_shopping)
# don't cascade empty supermarket category
if instance.supermarket_category:
instance.get_children().filter(inherit=True).exclude(ignore_inherit__field='supermarket_category').update(supermarket_category=instance.supermarket_category)