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36 lines
1.1 KiB
Python
36 lines
1.1 KiB
Python
from django.db.models.signals import post_save, post_delete
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from django.dispatch import receiver
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from django.db.models import Count, Q
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from rides.models import Ride
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from .models import Park
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def update_park_ride_counts(park):
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"""Update total_rides and total_roller_coasters for a park"""
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operating_rides = Q(status='OPERATING')
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# Count total operating rides
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total_rides = park.rides.filter(operating_rides).count()
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# Count total operating roller coasters
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total_coasters = park.rides.filter(
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operating_rides,
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category='RC'
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).count()
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# Update park counts
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Park.objects.filter(id=park.id).update(
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total_rides=total_rides,
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total_roller_coasters=total_coasters
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)
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@receiver(post_save, sender=Ride)
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def ride_saved(sender, instance, **kwargs):
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"""Update park counts when a ride is saved"""
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update_park_ride_counts(instance.park)
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@receiver(post_delete, sender=Ride)
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def ride_deleted(sender, instance, **kwargs):
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"""Update park counts when a ride is deleted"""
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update_park_ride_counts(instance.park)
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