Fixed #720 -- Added first_on_page() and last_on_page() methods to Obj…

…ectPaginator. Thanks, m@bagai.com

git-svn-id: http://code.djangoproject.com/svn/django/trunk@3040 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/paginator.py

@@ -54,6 +54,26 @@ def has_next_page(self, page_number):
     def has_previous_page(self, page_number):
         return page_number > 0
 
+    def first_on_page(self, page_number):
+        """
+        Returns the 1-based index of the first object on the given page,
+        relative to total objects found (hits).
+        """
+        if page_number == 0:
+            return 1
+        return (self.num_per_page * page_number) + 1
+
+    def last_on_page(self, page_number):
+        """
+        Returns the 1-based index of the last object on the given page,
+        relative to total objects found (hits).
+        """
+        if page_number == 0 and self.num_per_page >= self._hits:
+            return self._hits
+        elif page_number == (self._pages - 1) and (page_number + 1) * self.num_per_page > self._hits:
+            return self._hits
+        return (page_number + 1) * self.num_per_page
+
     def _get_hits(self):
         if self._hits is None:
             self._hits = self.query_set.count()

tests/modeltests/pagination/models.py

@@ -55,4 +55,13 @@ def __repr__(self):
 >>> paginator.has_previous_page(1)
 True
 
+>>> paginator.first_on_page(0)
+1
+>>> paginator.first_on_page(1)
+6
+>>> paginator.last_on_page(0)
+5
+>>> paginator.last_on_page(1)
+9
+
 """