moviewyrm/bookwyrm/models/tag.py

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''' models for storing different kinds of Activities '''
import urllib.parse
from django.db import models
from bookwyrm import activitypub
from bookwyrm.settings import DOMAIN
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from .base_model import OrderedCollectionMixin, BookWyrmModel
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class Tag(OrderedCollectionMixin, BookWyrmModel):
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''' freeform tags for books '''
user = models.ForeignKey('User', on_delete=models.PROTECT)
book = models.ForeignKey('Edition', on_delete=models.PROTECT)
name = models.CharField(max_length=100)
identifier = models.CharField(max_length=100)
@classmethod
def book_queryset(cls, identifier):
''' county of books associated with this tag '''
return cls.objects.filter(identifier=identifier)
@property
def collection_queryset(self):
''' books associated with this tag '''
return self.book_queryset(self.identifier)
def get_remote_id(self):
''' tag should use identifier not id in remote_id '''
base_path = 'https://%s' % DOMAIN
return '%s/tag/%s' % (base_path, self.identifier)
def to_add_activity(self, user):
''' AP for shelving a book'''
return activitypub.Add(
id='%s#add' % self.remote_id,
actor=user.remote_id,
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object=self.book.to_activity(),
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target=self.remote_id,
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).serialize()
def to_remove_activity(self, user):
''' AP for un-shelving a book'''
return activitypub.Remove(
id='%s#remove' % self.remote_id,
actor=user.remote_id,
object=self.book.to_activity(),
target=self.to_activity(),
).serialize()
def save(self, *args, **kwargs):
''' create a url-safe lookup key for the tag '''
if not self.id:
# add identifiers to new tags
self.identifier = urllib.parse.quote_plus(self.name)
super().save(*args, **kwargs)
class Meta:
''' unqiueness constraint '''
unique_together = ('user', 'book', 'name')