src/catalogue/api/fields.py

   1 # This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
   2 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
   3 #
   4 from rest_framework import serializers
   5 from api.fields import AbsoluteURLField
   6 from catalogue.models import Book
   7 from club.models import Membership
   8
   9
  10 class BookLiked(serializers.ReadOnlyField):
  11     def __init__(self, source='pk', **kwargs):
  12         super(BookLiked, self).__init__(source=source, **kwargs)
  13
  14     def to_representation(self, value):
  15         request = self.context['request']
  16         if not hasattr(request, 'liked_books'):
  17             if request.user.is_authenticated():
  18                 request.liked_books = set(Book.tagged.with_any(request.user.tag_set.all()).values_list('id', flat=True))
  19             else:
  20                 request.liked_books = None
  21         if request.liked_books is not None:
  22             return value in request.liked_books
  23
  24
  25 class EmbargoURLField(AbsoluteURLField):
  26     def to_representation(self, value):
  27         request = self.context['request']
  28         if Membership.is_active_for(request.user):
  29             return super().to_representation(value)
  30         else:
  31             return None