Ticket #13531: django-find-size-without-name.diff

django/core/files/base.py

@@ -35 +35 @@
     def _get_size(self):
         if not hasattr(self, '_size'):
             if hasattr(self.file, 'size'):
-                self._size = self.file.size
-            elif os.path.exists(self.file.name):
+                self._size = self.file.size            
+            elif hasattr(self.file, 'name') and os.path.exists(self.file.name):
                 self._size = os.path.getsize(self.file.name)
             else:
-                raise AttributeError("Unable to determine the file's size.")
+                try:
+                    self.file.seek(0, 2)
+                    self._size = self.file.tell()
+                except IOError:
+                    raise AttributeError("Unable to determine the file's size.")
         return self._size
 
     def _set_size(self, size):