serialize.py 文件源码

def _document_typeof(doc_cls, field_name):
    try:
        orm_field = doc_cls._fields[field_name]
    except (KeyError, AttributeError):
        return None

    if isinstance(orm_field, ListField):
        orm_field = orm_field.field
    if isinstance(orm_field, (ReferenceField, EmbeddedDocumentField)):
        return orm_field.document_type

    return None