InvalidDocument:无法编码对象:<用户:用户对象>带有 MongoEngine 的 ReferenceField [英] InvalidDocument: Cannot encode object: <User: User object> ReferenceField with MongoEngine

问题描述

我一直在使用 Flask 和 MongoEngine，但由于 ReferenceField，我在尝试保存对象时遇到了问题.

I've been working with Flask and MongoEngine, and I am having trouble when trying to save an object because of a ReferenceField.

这是我的模型的样子:

class User(UserMixin, db.Document):
    first_name = db.StringField(max_length=255, required=True)
    last_name = db.StringField(max_length=255, required=True)
    email = db.StringField(max_length=255)

class Post(db.Document):
    description = db.StringField(max_length=255, required=True)
    inserted_at = db.DateTimeField(default=datetime.datetime.now, required=True)
    tags = db.ListField(db.EmbeddedDocumentField('Tag'))
    comments = db.ListField(db.EmbeddedDocumentField('Comment'))
    user = db.ReferenceField('User')

这是我创建 Post 对象的方式:

This is how I create the Post object:

    user = User.objects.filter(id=current_user.id).first()

    post = Post(
        description = request.json["description"],
        user = user
    )

我也试过:

user = current_user._get_current_object()

但我不断收到:

InvalidDocument: Cannot encode object: <User: User object>

对正在发生的事情有什么想法吗?

Any ideas on what's going on?

谢谢！

推荐答案

嗯，这是很久以前的问题了，但我遇到了同样的问题.我不知道是不是出于不同的原因，但上下文看起来确实非常相似.

Well, this is from a long time, but I got the same problem. I don't know if it's for different reasons, but the context does look very similar.

无论如何，看起来 current_user 对象是一个 LocalProxy 实例，它不能很好地与 mongoengine 配合使用.诀窍是强制"取消引用实例的 ObjectID，如下所示:

Anyway, it looks like the current_user object is a LocalProxy instance which does not play well with mongoengine. The trick was to "force" dereference the ObjectID of the instance, like this:

post = Post(
        description = request.json["description"],
        user = user.id
    )

这篇关于InvalidDocument:无法编码对象:<用户:用户对象>带有 MongoEngine 的 ReferenceField的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！