42 lines
1.2 KiB
Python
42 lines
1.2 KiB
Python
from django.db import models
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from model_utils.models import TimeStampedModel
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from users.models import CustomUser
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class Event(models.Model):
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start_year = models.IntegerField(default=2020)
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def __str__(self):
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return f"{self.start_year}-{self.start_year + 1}"
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def count_registrations(self):
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return self.eventregistration_set.count()
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def registration_of(self, user):
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if not user.is_authenticated:
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return None
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registrations = self.eventregistration_set.filter(user=user).all()
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if not registrations:
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return None
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assert (
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len(registrations) == 1
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), "Registrations should be unique per user and event"
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return registrations[0]
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class EventRegistration(TimeStampedModel):
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event = models.ForeignKey(Event, on_delete=models.CASCADE)
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user = models.ForeignKey(CustomUser, on_delete=models.CASCADE)
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class Meta:
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constraints = [
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models.UniqueConstraint(
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fields=["event", "user"], name="register_only_once_per_event"
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),
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]
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def __str__(self):
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return f"Reservation[{self.user.username}:{self.event.start_year}]"
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