Unimplemented PaginationProxy; moved pagination from penfield to core.

[philo.git] / utils.py

diff --git a/utils.py b/utils.py
index 340e9e4..11f9848 100644 (file)
--- a/utils.py
+++ b/utils.py
@@ -1,5 +1,6 @@
 from django.db import models
 from django.contrib.contenttypes.models import ContentType
+from django.core.paginator import Paginator, EmptyPage
 
 
 class ContentTypeLimiter(object):
@@ -62,3 +63,41 @@ def fattr(*args, **kwargs):
                        setattr(function, key, kwargs[key])
                return function
        return wrapper
+
+
+def paginate(objects, per_page=None, page_number=1):
+       """
+       Given a list of objects, return a (paginator, page, objects) tuple.
+       """
+       try:
+               per_page = int(per_page)
+       except (TypeError, ValueError):
+               # Then either it wasn't set or it was set to an invalid value
+               paginator = page = None
+       
+       # There also shouldn't be pagination if the list is too short. Try count()
+       # first - good chance it's a queryset, where count is more efficient.
+       try:
+               if objects.count() <= per_page:
+                       paginator = page = None
+       except AttributeError:
+               if len(objects) <= per_page:
+                       paginator = page = None
+       
+       try:
+               return paginator, page, objects
+       except NameError:
+               pass
+       
+       paginator = Paginator(objects, per_page)
+       try:
+               page_number = int(page_number)
+       except:
+               page_number = 1
+       
+       try:
+               page = paginator.page(page_number)
+       except EmptyPage:
+               page = None
+       
+       return paginator, page, objects