Currently `DatabaseStorage.path` is: ```python localpath = self._path(self.get_instance_name(name)) if not os.path.exists(localpath): raise NotImplementedError return localpath ``` I.e. if the file doesn't exist locally then it raises `NotImplementedError`. However, it is possible that if there are multiple webservers in front of a single database, then the file may be in the database but not in the local storage. The existing `_open` includes: ```python # Automatically write the file to the filesystem # if it's missing and exists in the database. # This happens if we're using multiple web servers connected # to a common database behind a load balancer. # One user might upload a file from one web server, and then # another might access if from another server. utils.write_file(name, f.content) ``` We should apply the same approach to `path` to automatically write the file to the local filesystem if it exists in the database but not locally.