AttributeError: 'SpooledTemporaryFile' object has no attribute 'seekable' in 1.12+

[hopson]

We're seeing a new error since the 1.12 release with settings:

❯ ./manage.py collectstatic --noinput
{"created": 1633964135.356417, "asctime": "2021-10-11 14:55:35,356", "levelname": "INFO", "name": "botocore.credentials", "message": "Found credentials in shared credentials file: ~/.aws/credentials"}
Traceback (most recent call last):
  File "/Users/hopson/src/ridereport/djscoots-clean/./manage.py", line 20, in <module>
    execute_from_command_line(sys.argv)
  File "/Users/hopson/.local/share/virtualenvs/djscoots-clean-mStJMKKB/lib/python3.9/site-packages/django/core/management/__init__.py", line 419, in execute_from_command_line
    utility.execute()
  File "/Users/hopson/.local/share/virtualenvs/djscoots-clean-mStJMKKB/lib/python3.9/site-packages/django/core/management/__init__.py", line 413, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Users/hopson/.local/share/virtualenvs/djscoots-clean-mStJMKKB/lib/python3.9/site-packages/django/core/management/base.py", line 354, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/Users/hopson/.local/share/virtualenvs/djscoots-clean-mStJMKKB/lib/python3.9/site-packages/django/core/management/base.py", line 398, in execute
    output = self.handle(*args, **options)
  File "/Users/hopson/.local/share/virtualenvs/djscoots-clean-mStJMKKB/lib/python3.9/site-packages/django/contrib/staticfiles/management/commands/collectstatic.py", line 187, in handle
    collected = self.collect()
  File "/Users/hopson/.local/share/virtualenvs/djscoots-clean-mStJMKKB/lib/python3.9/site-packages/django/contrib/staticfiles/management/commands/collectstatic.py", line 128, in collect
    for original_path, processed_path, processed in processor:
  File "/Users/hopson/.local/share/virtualenvs/djscoots-clean-mStJMKKB/lib/python3.9/site-packages/django/contrib/staticfiles/storage.py", line 399, in post_process
    yield from super().post_process(*args, **kwargs)
  File "/Users/hopson/.local/share/virtualenvs/djscoots-clean-mStJMKKB/lib/python3.9/site-packages/django/contrib/staticfiles/storage.py", line 231, in post_process
    for name, hashed_name, processed, _ in self._post_process(paths, adjustable_paths, hashed_files):
  File "/Users/hopson/.local/share/virtualenvs/djscoots-clean-mStJMKKB/lib/python3.9/site-packages/django/contrib/staticfiles/storage.py", line 303, in _post_process
    saved_name = self._save(hashed_name, content_file)
  File "/Users/hopson/.local/share/virtualenvs/djscoots-clean-mStJMKKB/lib/python3.9/site-packages/storages/backends/s3boto3.py", line 632, in _save
    return super()._save(name, tmp)
  File "/Users/hopson/.local/share/virtualenvs/djscoots-clean-mStJMKKB/lib/python3.9/site-packages/storages/backends/s3boto3.py", line 454, in _save
    if content.seekable():
AttributeError: 'SpooledTemporaryFile' object has no attribute 'seekable'

Our configuration:

STATICFILES_STORAGE = "storages.backends.s3boto3.S3ManifestStaticStorage"

Verified this behavior against both Django 3.2.7 and 3.2.8; reverting to 1.11.1 resolved the error.

[jschneier]

Thanks. Fix incoming.

[jschneier]

@hopson just released the fix as part of 1.12.1. Thanks again for the report.

[hopson]

@hopson just released the fix as part of 1.12.1. Thanks again for the report.

Verified, thanks very much for the quick turnaround!