How to get comment from embedded document in mongodb? - node.js

Question

I want to get the comment by ID that is an array of embedded schema object in feedback schema model, see the code below:
Feedback schema:
const FeedbackSchema = new Schema({
receiver: {
type: Schema.Types.ObjectId,
ref: 'User',
required: true,
},
comments: [
{
text: { type: String, maxlength: 500 },
postedBy: { type: Schema.Types.ObjectId, ref: 'User' },
date: { type: Date, default: Date.now() },
},
],
createdAt: {
type: Date,
default: Date.now(),
},
});
module.exports = {
FeedbackSchema: mongoose.model('Feedback', FeedbackSchema),
};
Comment controller and route:
router.get('/comment/:feedback_id/:comment_id', userAuthorization, getComment);
exports.getComment = async (req, res) => {
const feedback = await FeedbackSchema.findById({
_id: req.params.feedback_id,
});
if (!feedback) return res.status(404).send('Feedback not found');
const comment = feedback.comments.find({ _id: req.params.comment_id }); //error is in this line
if (!comment) return res.status(404).send('Comment not found');
return res.json(comment);
}
How do I get the comment based on feedback_id and comment_id?

Answer 1

Try to use findOne:
exports.getComment = async (req, res) => {
const feedback = await FeedbackSchema.findOne({
_id: req.params.feedback_id,
comments._id: req.params.comment_id
});
if (!feedback) return res.status(404).send('Feedback not found');
return res.json(feedback.comments);
};
Also, make sure that you declare the Comment schema separately:
const CommentSchema = new Schema({
text: { type: String, maxlength: 500 },
postedBy: { type: Schema.Types.ObjectId, ref: 'User' },
date: { type: Date, default: Date.now() },
})
const FeedbackSchema = new Schema({
receiver: {
type: Schema.Types.ObjectId,
ref: 'User',
required: true,
},
comments: [CommentSchema],
createdAt: {
type: Date,
default: Date.now(),
},
});