我有下面的Post模式。post架构包含一个数组字段，该字段可能包含其他post作为回复。我想做的是检索没有在任何职位的答复领域引用的所有文件。基本上得到所有的职位，不是一个原始职位的答复。

const mongoose = require('mongoose');

const schema = new mongoose.Schema({
    creator: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'User',
        validate: [mongoose.Types.ObjectId.isValid, 'Creator ID is invalid']
    },
    owner: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'User',
        validate: [mongoose.Types.ObjectId.isValid, 'Owner ID is invalid']
    },
    content: {
        type: String,
        required: 'Content is required'
    },
    likes: [
        {
            type: mongoose.Schema.Types.ObjectId,
            ref: 'Like',
            validate: [mongoose.Types.ObjectId.isValid, 'Like ID is invalid']
        }
    ],
    replies: [
        {
            type: mongoose.Schema.Types.ObjectId,
            ref: 'Post'
        }
    ]
}, {
    autoCreate: true,
    timestamps: true
});

const Post = mongoose.model('Post', schema);

module.exports = Post;

我试过使用$lookup与$match和$nin，但我不能使它正常工作。任何帮助将不胜感激。