X-Git-Url: https://git.mdrn.pl/wolnelektury.git/blobdiff_plain/33af401eb4abe15a37d0147807d06a9b19eaa802..df60910b2d457f031cbe0a153e51e7378c0165d8:/src/catalogue/models/book.py

diff --git a/src/catalogue/models/book.py b/src/catalogue/models/book.py
index 01f02816a..2371103e7 100644
--- a/src/catalogue/models/book.py
+++ b/src/catalogue/models/book.py
@@ -226,6 +226,18 @@ class Book(models.Model):
     def isbn_mobi(self):
         return self.get_extra_info_json().get('isbn_mobi')
 
+    def is_accessible_to(self, user):
+        if not self.preview:
+            return True
+        if not user.is_authenticated:
+            return False
+        Membership = apps.get_model('club', 'Membership')
+        if Membership.is_active_for(user):
+            return True
+        Funding = apps.get_model('funding', 'Funding')
+        if Funding.objects.filter(user=user, offer__book=self):
+            return True
+        return False
 
     def save(self, force_insert=False, force_update=False, **kwargs):
         from sortify import sortify
@@ -738,6 +750,8 @@ class Book(models.Model):
     def update_references(self):
         from references.models import Entity, Reference
         master = self.get_master()
+        if master is None:
+            master = []
         found = set()
         for i, sec in enumerate(master):
             for ref in sec.findall('.//ref'):
@@ -829,7 +843,7 @@ class Book(models.Model):
     def related_themes(self):
         return Tag.objects.usage_for_queryset(
             Fragment.objects.filter(models.Q(book=self) | models.Q(book__ancestor=self)),
-            counts=True).filter(category='theme')
+            counts=True).filter(category='theme').order_by('-count')
 
     def parent_cover_changed(self):
         """Called when parent book's cover image is changed."""