meta.py 文件源码

def add_key(key, key_type, value_type=None, value_regexp=None, session=None):
    """
    Adds a new allowed key.

    :param key: the name for the new key.
    :param key_type: the type of the key: all(container, dataset, file), collection(dataset or container), file, derived(compute from file for collection).
    :param value_type: the type of the value, if defined.
    :param value_regexp: the regular expression that values should match, if defined.
    :param session: The database session in use.
    """

    # Check if value_type is supported
    if value_type and value_type not in [str(t) for t in AUTHORIZED_VALUE_TYPES]:
        raise UnsupportedValueType('The type \'%(value_type)s\' is not supported for values!' % locals())

    new_key = models.DIDKey(key=key, value_type=value_type and str(value_type), value_regexp=value_regexp, key_type=key_type)
    try:
        new_key.save(session=session)
    except IntegrityError as error:
        if error.args[0] == "(IntegrityError) column key is not unique":
            raise Duplicate('key \'%(key)s\' already exists!' % locals())
        raise