Changed paths are incorrect in schemas with nested Maps #15678
Description
Prerequisites
- I have written a descriptive issue title
- I have searched existing issues to ensure the bug has not already been reported
Mongoose version
8.19.0
Node.js version
24.9.0
MongoDB server version
6.20.0
Typescript version (if applicable)
No response
Description
When working with a mongoose document containing a map whose values are subdocuments, and those subdocuments contain maps or arrays, change tracking seems to emit completely incorrect paths for the edits of those fields. The resulting update document to mongo is broken and makes updating those nested paths impossible.
Only an issue for existing documents, creating new documents with such nested fields works as expected.
Steps to Reproduce
const { Schema, model } = require("mongoose");
const itemSchema = new Schema({
name: String,
itemNum: Number,
itemTags: [String],
}, { _id: false });
const groupSchema = new Schema({
items: { type: Map, of: itemSchema, default: {} },
groupNum: Number,
groupTags: [String],
}, { _id: false });
const parentSchema = new Schema({
groups: { type: Map, of: groupSchema, default: {} },
});
const M = model("parentSchema", parentSchema);
// as if read from M.findOne() etc
const x = new M().init({
groups: {
g1: {
items: {
i1: {
name: "my item"
}
},
groupTags: ["hi"]
}
}
});
// after each test below in isolation (others commented)
// console.log(x.getChanges())
x.groups.get("g1").items.set("i2", { name: "second item" });
// { '$unset': { 'groups.g1.groups.g1.i2': 1 } }
x.groups.get("g1").groupNum = 42;
// { '$set': { 'groups.g1.groupNum': 42 } } -- looks good!
x.groups.get("g1").groupTags.push("yo");
// { '$unset': { 'groups.g1.groups.g1': 1 } }
x.groups.get("g1").items.get("i1").name = "different item";
// { '$unset': { 'groups.g1.groups.g1.i1.name': 1 } }
x.groups.get("g1").items.get("i1").itemNum = 20;
// { '$unset': { 'groups.g1.groups.g1.i1.itemNum': 1 } }
x.groups.get("g1").items.get("i1").itemTags.push("foo");
// { '$unset': { 'groups.g1.groups.g1.i1.itemTags': 1 } }
Expected Behavior
Modifications for nested paths are generated correctly, i.e. set/push update operators