def get_collection():
    """Get the entire collection.

        GET /entity -> 200 OK, list of members

        If a query parameter named $$ is present on the request, it must be
        a JSON object with keys that correspond to the keyword args of the
        context's `get_collection` method. The object will be JSON-decoded,
        but no further processing will be done on the resulting dict (i.e.,
        types won't be coerced, etc).

        """
