How to save a subdocument (embedded) with a reference in mongoose?-CodePudding

I have this 2 mongoose schemas, the first is embedded in the second

const mongoose = require("mongoose");

const CommentSchema = mongoose.Schema({
    user: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'User',
        required: true
    },
    text: {
        type: String,
        minLength: 3,
        maxlength: 500,
        required: true
    },
}, {timestamps: true} );

const PictureSchema = mongoose.Schema({
    user: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'User',
        required: true
    },
    title: {
        type: String,
        minLength: 3,
        maxlength: 80,
        required: true
    },
    comments: [CommentSchema]
}, {timestamps: true} );

module.exports = mongoose.models.Picture || mongoose.model('Picture', PictureSchema);

Both schemas are in the same file. Note that both documents refer to another Schema called User. I am getting an error when saving:

const comment = new Comment({
    user: user,
    text: description
});

const picture = new Picture({
                user: user,
                title: title
});

picture.comments.push(comment);
await picture.save();

user is a user object from the other schema, I am confident it is good as previous to add the comments array it was working.

the error I am getting says ReferenceError: Comment is not defined

It looks to me that because I am including Picture like this

const Picture = require('../model/Picture');

it can't find Comment, but I tried putting them in 2 separated files and still not working.

What am I doing wrong?

CodePudding user response：

It seems to me you only have problem with module exports. To make Comment accessible from external file, you need to export it.

In the end of schema definition file use:

module.exports.Picture = mongoose.models.Picture || mongoose.model('Picture', PictureSchema);
module.exports.Comment = mongoose.models.Comment || mongoose.model('Comment', CommentSchema);

In the file where you use models use:

const { Picture, Comment } = require('../model/Picture');