takahe/users/models/bookmark.py

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2023-03-11 18:17:20 +00:00
from django.db import models
class Bookmark(models.Model):
"""
A (private) bookmark of a Post by an Identity
"""
identity = models.ForeignKey(
"users.Identity",
on_delete=models.CASCADE,
related_name="bookmarks",
)
post = models.ForeignKey(
"activities.Post",
on_delete=models.CASCADE,
related_name="bookmarks",
)
created = models.DateTimeField(auto_now_add=True)
class Meta:
unique_together = [("identity", "post")]
def __str__(self):
return f"#{self.id}: {self.identity}{self.post}"
@classmethod
def for_identity(cls, identity, posts=None, field="id"):
"""
Returns a set of bookmarked Post IDs for the given identity. If `posts` is
specified, it is used to filter bookmarks matching those in the list.
"""
if identity is None:
return set()
queryset = cls.objects.filter(identity=identity)
if posts:
queryset = queryset.filter(post_id__in=[getattr(p, field) for p in posts])
return set(queryset.values_list("post_id", flat=True))