Documents in subfolders in s3

documents.py

class AbstractPermissionedDocument(AbstractDocument):
    """
    We are now using a patched version of Wagtails document permissions via collection permissions
    and using WAGTAILDOCS_SERVE_METHOD = 'serve_view' so users never see the S3 url for documents.
    Note, however, that they'll still see the base filename in the URLs that Wagtail
    serves.

    We monkey patch the serve() method to set cache control headers to private. The code
    for this is in multitenant.wagtail_patches.views.misc.py
    """
    file = S3FileField(upload_to=get_upload_to, verbose_name="file", max_length=255)

    admin_form_fields = Document.admin_form_fields

    class Meta:
        abstract = True

    def get_upload_to(self, filename):
        # This function is called by wagtail.documents.models.get_upload_to(), to which self.file.upload_to is set.
        full_path = PurePath(get_collection_path(self.collection), "documents", filename)
        return str(full_path)


class PermissionedDocument(AbstractPermissionedDocument):

    search_fields = [
        *AbstractDocument.search_fields,
        index.FilterField("created_at"),
    ]