def METHOD_NAME(self, obj, field):
    """patch in context for nested field"""
    if isinstance(field.nested, (str, bytes)):
        nested = get_class(field.nested)
    else:
        nested = field.nested
    if isclass(nested) and issubclass(nested, Schema):
        only = field.only
        exclude = field.exclude
        context = getattr(field.parent, "context", {})
        field.nested = nested(only=only, exclude=exclude, context=context)
    return super().METHOD_NAME(obj, field)