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45 lines
1.3 KiB
Python
45 lines
1.3 KiB
Python
from django.db import models
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from django.utils import timezone
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from users.models import Announcement, User
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class AnnouncementService:
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"""
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Handles viewing and dismissing announcements
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"""
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def __init__(self, user: User):
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self.user = user
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@classmethod
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def visible_queryset(cls) -> models.QuerySet[Announcement]:
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"""
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Common visibility query
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"""
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now = timezone.now()
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return Announcement.objects.filter(
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models.Q(start__lte=now) | models.Q(start__isnull=True),
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models.Q(end__gte=now) | models.Q(end__isnull=True),
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published=True,
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).order_by("-start", "-created")
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@classmethod
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def visible_anonymous(cls) -> models.QuerySet[Announcement]:
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"""
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Returns all announcements marked as being showable to all visitors
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"""
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return cls.visible_queryset().filter(include_unauthenticated=True)
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def visible(self) -> models.QuerySet[Announcement]:
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"""
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Returns all announcements that are currently valid and should be shown
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to a given user.
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"""
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return self.visible_queryset().exclude(seen=self.user)
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def mark_seen(self, announcement: Announcement):
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"""
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Marks an announcement as seen by the user
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"""
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announcement.seen.add(self.user)
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