Add a model to store future media list.

media/models.py

@@ -84,6 +84,23 @@ class Media(models.Model):
         ordering = ['title', 'subtitle']
 
 
+class FutureMedia(models.Model):
+    isbn = ISBNField(
+        _('ISBN'),
+        help_text=_('You may be able to scan it from a bar code.'),
+        unique=True,
+        blank=True,
+        null=True,
+    )
+
+    class Meta:
+        verbose_name = _("future medium")
+        verbose_name_plural = _("future media")
+
+    def __str__(self):
+        return "Future medium (ISBN: {isbn})".format(isbn=self.isbn, )
+
+
 class Emprunt(models.Model):
     media = models.ForeignKey(
         'Media',