Clean Django Storage Backend Configuration

TIL: You are able to pass arbitrary configuration values via the OPTIONS key to Django storage backends. They are passed as keyword arguments to the __init__ method of the storage backend.

That fact is pointed out in the Django STORAGES documentation and I apparently even used that before in kition-dev/djangodefaults… Using these OPTIONS I was able to turn

STATICFILES_STORAGE_HASH_EXCLUSIONS = [
    "css/\"images/",
]

STORAGES = {
    "staticfiles": {
        "BACKEND": "myproject.storage.SelectiveManifestStaticFilesStorage",
    },
}

… into …

STORAGES = {
    "staticfiles": {
        "BACKEND": "myproject.storage.SelectiveManifestStaticFilesStorage",
        "OPTIONS": {
            "hash_exclusions": [
                "css/\"images/",
            ],
        }
    },
}

Having got rid of that dangling configuration value loosely floating in the settings is a win for me. As a bonus, overriding the static files storage in the test settings discards the configuration options, too. Sweet.

If your custom storage backend accepts keyword arguments, put them under OPTIONS — it keeps settings cohesive and easier to override in different environments.