使用refPath的Mongoose填充ObjectID的数组返回空数组

Question

issue.js

const mongoose;
const schema = new mongoose.Schema({
    docs: {
        type: [mongoose.Schema.Types.ObjectId],
        refPath: 'coll',
        required: true
    },
    coll: {
        type: String,
        required: true,
        enum: ['Product', 'Service']
    }
});

module.exports = mongoose.model('Issue', schema);

部分index.js

try{
    let issues = await Issue.find().populate('docs');

    console.log(issues);
    //every issue in issues, has an empty 'docs' array, when it should consist of products/services that exist

}catch(e){}

不确定数组为什么不能使它工作，我尝试将docs字段设置为奇异的ObjectId，并且效果很好。我唯一能想到的是，因为它是一个数组，所以refPath必须不同，但是我不确定我可以添加什么，因为我尝试使用'this.coll'。

Answer 1

我看到您的架构中有一个错误。不知道这是否是问题，但是您可以尝试。

const mongoose;
const schema = new mongoose.Schema({
    docs: [{
        type: mongoose.Schema.Types.ObjectId, // <-- This line
        refPath: 'coll',
        required: true
    }],
    coll: {
        type: String,
        required: true,
        enum: ['Product', 'Service']
    }
});