How to get All items associated to a user in mongoose - mongodb

Question

I have a collection of Items that a particular make and perform a transaction. In my schema, I associate the userId to each item. I want to be able to display as a list all the items that the user owns.
Here I have managed to total up all sizes of each item but I cant work out a way how to get a total for each user
{
id: Number,
x: Number,
y: Number,
xSize: String,
ySize: String,
imageSource: String,
user: { type: mongoose.Schema.ObjectId, ref: 'User' }
},
{ timestamps: true }
);
const UserSchema = new Schema(
{
id: Number,
name: String,
website: String,
},
{ timestamps: true }
);
Item.find({}, function (err, items) {
var itemMap = {};
items.forEach(function (item) {
itemMap[item._id] = item;
});
var countedNames = items.reduce(function (allNames, name) {
if (name.xSize in allNames) {
allNames[name.xSize]++;
}
else {
allNames[name.xSize] = 1;
}
return allNames;
}, {});
Essentially i want to get a list basically saying
{name:"Dave", website:"www.google.com, items:[item1, item2]}
where item1 and item2 relate to the item schema

Answer 1

You should rewrite your UserSchema to contain a reference to the item, in this format:
const UserSchema = new Schema(
{
id: Number,
name: String,
website: String,
items:
[{
item: {type: mongoose.Schema.ObjectId, ref: 'Item'}
}]
},
{ timestamps: true }
);
This will simply allow you to perform the following query:
User.find({}).populate('Item')
Which would return the User document, and all items associated under the document.
You could do the following:
let users = User
.find({})
.populate('Item')
.exec(function (err, users) {
if (err) { console.log(err); }
console.log(users)
}
Rewriting the schema will make querying users for their items much easier.