Pushing onto nested subdoc array with MongooseJS

Question

I have the following schema in MongooseJS:

const ParentChildCommentSchema = new mongoose.Schema({
  date: Date,
  from: { type:mongoose.Schema.Types.ObjectId, ref:'Parent' },
  message: String,
});

const ParentChildSchema = new mongoose.Schema({
  child: { type:mongoose.Schema.Types.ObjectId, ref:'Child' },
  comments: [ ParentChildCommentSchema ],
});

const ParentSchema = new mongoose.Schema({
  name: String,
  description: String,
  children: [ ParentChildSchema ],
});

Where Parents have Children, and each Parent/Child relationship can have an array of comments.

I'm trying to push a comment with

const query = {
  "_id": parentId,
  "children._id": parentChildId,
};

const update = {
  "$push": { 
    "children.$.comments": { 
      "date": Date.now(),
      "from": parentId,
      "message": message,
    }
  }
};

Pack.findOneAndUpdate(query, update, err => ...)

The query isn't throwing any errors. But no comment is being added. What am I doing wrong?

Not sure if this will make much of a difference, but change "$push" to $push — Derek Pollard
– Derek Pollard, Commented Sep 18, 2016 at 22:21
I don't think that makes a difference. I have an almost identical query that $set's a value in the ParentChildSchema and it works fine wrapped in quotes. — nicholas
– nicholas, Commented Sep 18, 2016 at 22:24
Tested it, but no luck. Still completes successfully, but doesn't push onto the array. — nicholas
– nicholas, Commented Sep 18, 2016 at 22:25
Because children is itself an array. Using children.$.comments will target the item in children specified in the query. — nicholas
– nicholas, Commented Sep 18, 2016 at 22:50

nicholas · Accepted Answer · 2016-09-18 22:41:49Z

1

Turns out the problem was in the router -- not passing the ParentChild id through -- so the code above is correct and working properly.

answered Sep 18, 2016 at 22:41

nicholas

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