add a revert button to return scan gallery to first page for this book

[redakcja.git] / apps / catalogue / helpers.py

diff --git a/apps/catalogue/helpers.py b/apps/catalogue/helpers.py
index 7bc2481..df64ade 100644 (file)
--- a/apps/catalogue/helpers.py
+++ b/apps/catalogue/helpers.py
@@ -1,3 +1,4 @@
+from datetime import date

 from functools import wraps
 
 from django.db.models import Count
 from functools import wraps
 
 from django.db.models import Count


@@ -28,3 +29,10 @@ def cached_in_field(field_name):
             return value
         return wrapped
     return decorator
             return value
         return wrapped
     return decorator

+
+
+def parse_isodate(isodate):
+    try:
+        return date(*[int(p) for p in isodate.split('-')])
+    except (AttributeError, TypeError, ValueError):
+        raise ValueError("Not a date in ISO format.")