moviewyrm/bookwyrm/models/shelf.py

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''' puttin' books on shelves '''
from django.db import models
from bookwyrm import activitypub
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from .base_model import BookWyrmModel, OrderedCollectionMixin
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class Shelf(OrderedCollectionMixin, BookWyrmModel):
''' a list of books owned by a user '''
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name = models.CharField(max_length=100)
identifier = models.CharField(max_length=100)
user = models.ForeignKey('User', on_delete=models.PROTECT)
editable = models.BooleanField(default=True)
books = models.ManyToManyField(
'Edition',
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symmetrical=False,
through='ShelfBook',
through_fields=('shelf', 'book')
)
@property
def collection_queryset(self):
''' list of books for this shelf, overrides OrderedCollectionMixin '''
return self.books
def get_remote_id(self):
''' shelf identifier instead of id '''
base_path = self.user.remote_id
return '%s/shelf/%s' % (base_path, self.identifier)
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class Meta:
''' user/shelf unqiueness '''
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unique_together = ('user', 'identifier')
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class ShelfBook(BookWyrmModel):
''' many to many join table for books and shelves '''
book = models.ForeignKey('Edition', on_delete=models.PROTECT)
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shelf = models.ForeignKey('Shelf', on_delete=models.PROTECT)
added_by = models.ForeignKey(
'User',
blank=True,
null=True,
on_delete=models.PROTECT
)
def to_add_activity(self, user):
''' AP for shelving a book'''
return activitypub.Add(
id='%s#add' % self.remote_id,
actor=user.remote_id,
object=self.book.to_activity(),
target=self.shelf.to_activity()
).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.shelf.to_activity()
).serialize()
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class Meta:
''' an opinionated constraint!
you can't put a book on shelf twice '''
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unique_together = ('book', 'shelf')