closes #12 - set modified time for new files

storages/backends/s3boto.py

@@ -16,7 +16,7 @@
     from boto.s3.connection import S3Connection, SubdomainCallingFormat
     from boto.exception import S3ResponseError
     from boto.s3.key import Key as S3Key
-    from boto.utils import parse_ts
+    from boto.utils import parse_ts, ISO8601
 except ImportError:
     raise ImproperlyConfigured("Could not load Boto's S3 bindings.\n"
                                "See https://github.com/boto/boto")
@@ -411,6 +411,7 @@ def _save(self, name, content):
             key = self.bucket.new_key(encoded_name)
         if self.preload_metadata:
             self._entries[encoded_name] = key
+            key.last_modified = datetime.utcnow().strftime(ISO8601)
 
         key.set_metadata('Content-Type', content_type)
         self._save_content(key, content, headers=headers)

tests/test_s3boto.py

@@ -9,7 +9,7 @@
 from django.core.files.base import ContentFile
 
 from boto.s3.key import Key
-from boto.utils import ISO8601
+from boto.utils import parse_ts, ISO8601
 
 from storages.compat import urlparse
 from storages.backends import s3boto
@@ -290,7 +290,6 @@ def test_new_file_modified_time(self):
         with mock.patch('storages.backends.s3boto.datetime') as mock_datetime:
             mock_datetime.utcnow.return_value = utcnow
             self.storage.save(name, content)
-            self.assertEqual(self.storage.entries[name].last_modified,
-                             utcnow.strftime(ISO8601))
-            self.storage.modified_time(name) # should not raise an exception
+            self.assertEqual(self.storage.modified_time(name),
+                             parse_ts(utcnow.strftime(ISO8601)))