+
+
+class Spent(models.Model):
+ amount = models.DecimalField(_('amount'), decimal_places=2, max_digits=10)
+ timestamp = models.DateField(_('when'))
+ book = models.ForeignKey(Book)
+
+ class Meta:
+ verbose_name = _('money spent on a book')
+ verbose_name_plural = _('money spent on books')
+ ordering = ['-timestamp']
+
+ def __unicode__(self):
+ return u"Spent: %s" % unicode(self.book)