1 # -*- coding: utf-8 -*-
2 # This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
3 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
5 from django.db import models
6 from jsonfield import JSONField
9 class ISBNPool(models.Model):
10 prefix = models.CharField(max_length=10)
11 suffix_from = models.IntegerField()
12 suffix_to = models.IntegerField()
13 ref_from = models.IntegerField()
14 next_suffix = models.IntegerField()
17 def check_digit(prefix12):
18 digits = [int(d) for d in prefix12]
19 return str((-sum(digits[0::2]) + 7 * sum(digits[1::2])) % 10)
21 def isbn(self, suffix):
22 prefix_length = len(self.prefix)
23 suffix_length = 12 - prefix_length
24 suffix_str = ('%%0%dd' % suffix_length) % suffix
25 prefix12 = self.prefix + suffix_str
26 return prefix12 + self.check_digit(prefix12)
29 class ONIXRecord(models.Model):
30 isbn_pool = models.ForeignKey(ISBNPool)
31 datestamp = models.DateField(auto_now=True)
32 suffix = models.IntegerField()
33 product_form = models.CharField(max_length=4)
34 product_form_detail = models.CharField(max_length=8, blank=True)
35 title = models.CharField(max_length=256)
36 part_number = models.CharField(max_length=64, blank=True)
37 contributors = JSONField() # roles, names, optional: ISNI, date of birth/death
38 edition_type = models.CharField(max_length=4)
39 edition_number = models.IntegerField(default=1)
40 language = models.CharField(max_length=4)
41 imprint = models.CharField(max_length=256)
42 publishing_date = models.DateField()
45 ordering = ['isbn_pool__id', 'suffix']
48 return self.isbn_pool.isbn(self.suffix)
51 return 'pl-eisbn-%s' % (self.isbn_pool.ref_from + self.suffix)