Added __ traversal support

pagemore/templatetags/pagemore.py

@@ -5,6 +5,23 @@
 
 register = template.Library()
 
+def traverse_object(obj, fieldspec):
+    """Traverses a Django model double underscore fieldpath
+
+    Example::
+        >>> traverse_object(person, 'group__foo')
+        (group, 'foo')
+    """
+    parts = fieldspec.split('__')
+    field = parts[-1]
+    for part in parts[:-1]:
+        obj = getattr(obj, part)
+    return obj, field
+
+def traverse_getattr(obj, fieldspec):
+    obj, field = traverse_object(obj, fieldspec)
+    return getattr(obj, field)
+
 @register.assignment_tag(takes_context=True)
 def more_paginator(context, objects, per_page=10, ordered_by='id'):
     request = context['request']
@@ -15,24 +32,30 @@ def more_paginator(context, objects, per_page=10, ordered_by='id'):
         field = ordered_by
         op = 'gt'
     get_param = 'pagemore_after'
+    get_param_ts = 'pagemore_ts'
     after_val = request.GET.get(get_param)
+    is_timestamp = request.GET.get(get_param_ts, False)
     if after_val is not None:
-        field_type = objects.model._meta.get_field_by_name(field)[0]
-        if isinstance(field_type, DateTimeField):
-            after_val = datetime.fromtimestamp(int(after_val))
+        if is_timestamp:
+            try:
+                after_val = datetime.fromtimestamp(float(after_val))
+            except TypeError:
+                pass
         objects = objects.filter(**{field + '__' + op: after_val} )
     objects = list(objects[0:per_page+1]) # evaluate qs, intentionally
     has_more = len(objects) > per_page
     objects = objects[0:per_page]
     object_count = len(objects) 
     if object_count:
-        next_after_val = getattr(objects[-1], field)
+        next_after_val = traverse_getattr(objects[-1], field)
         if isinstance(next_after_val, datetime):
-            next_after_val = int(time.mktime(next_after_val.timetuple()))
+            is_timestamp = True
+            next_after_val = time.mktime(next_after_val.timetuple())
     else:
         next_after_val = None
     get = request.GET.copy()
     get[get_param] = next_after_val
+    get[get_param_ts] = '1' if is_timestamp else ''
     return dict(objects=objects,
                 object_count=object_count,
                 has_more=has_more,