fields.py 文件源码

def ChildField(cls, default=NOTHING, required=True, repr=True, cmp=True,
               key=None):
    """
    Create new child field on a model.

    :param cls: class (or name) of the model to be related.
    :param default: any object value of type cls
    :param bool required: whether or not the object is invalid if not provided.
    :param bool repr: include this field should appear in object's repr.
    :param bool cmp: include this field in generated comparison.
    :param string key: override name of the value when converted to dict.
    """
    default = _init_fields.init_default(required, default, None)
    converter = converters.to_child_field(cls)
    validator = _init_fields.init_validator(required, cls)
    return attrib(default=default, convert=converter, validator=validator,
                  repr=repr, cmp=cmp, metadata=dict(key=key))