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