def group_membership():
    """ RESTful CRUD controller for options.s3json lookups """

    if auth.permission.format not in "s3json":
        return ""

    # Pre-process
    def prep(r):
        if r.method != "options":
            return False
        return True
    s3.prep = prep

    return s3_rest_controller()

# -----------------------------------------------------------------------------
dataset/ETHPy150Open sahana/eden/controllers/org.py/group_membership/operator `!=` -> `not in`