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77 lines
3.2 KiB
Python
77 lines
3.2 KiB
Python
from datetime import datetime, timezone
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from django.db import models
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from django.db.models import CASCADE
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from django.db.models.functions import Lower, Upper
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from typing_extensions import override
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from zerver.models.constants import MAX_TOPIC_NAME_LENGTH
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from zerver.models.recipients import Recipient
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from zerver.models.streams import Stream
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from zerver.models.users import UserProfile
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class UserTopic(models.Model):
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user_profile = models.ForeignKey(UserProfile, on_delete=CASCADE)
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stream = models.ForeignKey(Stream, on_delete=CASCADE)
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recipient = models.ForeignKey(Recipient, on_delete=CASCADE)
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topic_name = models.CharField(max_length=MAX_TOPIC_NAME_LENGTH)
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# The default value for last_updated is a few weeks before tracking
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# of when topics were muted was first introduced. It's designed
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# to be obviously incorrect so that one can tell it's backfilled data.
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last_updated = models.DateTimeField(default=datetime(2020, 1, 1, 0, 0, tzinfo=timezone.utc))
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class VisibilityPolicy(models.IntegerChoices):
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# A normal muted topic. No notifications and unreads hidden.
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MUTED = 1, "Muted topic"
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# This topic will behave like an unmuted topic in an unmuted stream even if it
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# belongs to a muted stream.
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UNMUTED = 2, "Unmuted topic in muted stream"
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# This topic will behave like `UNMUTED`, plus some additional
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# display and/or notifications priority that is TBD and likely to
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# be configurable; see #6027. Not yet implemented.
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FOLLOWED = 3, "Followed topic"
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# Implicitly, if a UserTopic does not exist, the (user, topic)
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# pair should have normal behavior for that (user, stream) pair.
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# We use this in our code to represent the condition in the comment above.
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INHERIT = 0, "User's default policy for the stream."
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visibility_policy = models.SmallIntegerField(
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choices=VisibilityPolicy.choices, default=VisibilityPolicy.MUTED
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)
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class Meta:
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constraints = [
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models.UniqueConstraint(
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"user_profile",
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"stream",
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Lower("topic_name"),
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name="usertopic_case_insensitive_topic_uniq",
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),
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]
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indexes = [
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models.Index("stream", Upper("topic_name"), name="zerver_mutedtopic_stream_topic"),
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# This index is designed to optimize queries fetching the
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# set of users who have special policy for a stream,
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# e.g. for the send-message code paths.
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models.Index(
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fields=("stream", "topic_name", "visibility_policy", "user_profile"),
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name="zerver_usertopic_stream_topic_user_visibility_idx",
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),
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# This index is useful for handling API requests fetching the
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# muted topics for a given user or user/stream pair.
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models.Index(
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fields=("user_profile", "visibility_policy", "stream", "topic_name"),
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name="zerver_usertopic_user_visibility_idx",
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),
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]
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@override
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def __str__(self) -> str:
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return f"({self.user_profile.email}, {self.stream.name}, {self.topic_name}, {self.last_updated})"
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