<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def init_attachment_cache(self):
 """ Initializes the attachment cache for the current view. """

        if self.request.method == 'GET':
            # Invalidates previous attachments
            attachments_cache.delete(self.get_attachments_cache_key(self.request))
            return

        # Try to restore previous uploaded attachments if applicable
        attachments_cache_key = self.get_attachments_cache_key(self.request)
        restored_attachments_dict = attachments_cache.get(attachments_cache_key)
        if restored_attachments_dict:
            restored_attachments_dict.update(self.request.FILES)
            self.request._files = restored_attachments_dict

        # Updates the attachment cache if files are available
        if self.request.FILES:
            attachments_cache.set(attachments_cache_key, self.request.FILES)