Collections association with nested in Mongoose - node.js

Question

I had a problem with the association of collections.
I spent 2 days and still did not solve the problem, it's new for me.
My models:
// Schema opened cases
const openedSchema = new Schema({
user: {
type: Schema.Types.ObjectId,
ref: 'user',
required: [true, 'user is required'],
index: true
},
weapon: {
type: Schema.Types.ObjectId,
ref: 'cases.weapons',
required: [true, 'weapon is required'],
index: true
},
sellPrice: {
type: Number,
default: null
},
status: {
type: Number,
default: 0
}
}, {
timestamps: true
});
const opened = mongoose.model('opened', openedSchema);
// list cases
const casesSchema = new Schema({
name: {
type: String,
unique: true,
required: [true, 'name is required']
},
price: {
type: Number,
required: [true, 'price is required']
},
weapons: [ {
weapon: {
type: Schema.Types.ObjectId,
ref: 'weapon',
index: true
}
} ]
}, {
timestamps: false
});
const cases = mongoose.model('cases', casesSchema);
// list weapons
const weaponSchema = new Schema({
name: {
type: String,
unique: true,
required: [true, 'name is required']
},
price: {
type: Number,
required: [true, 'price is required']
},
autoship: {
count: Number,
status: Boolean,
price: Number
}
}, {
timestamps: false
});
const weapon = mongoose.model('weapon', weaponSchema);
That's what documents look like
// cases
{
"_id": {
"$oid": "59653bcfa9ac622e1913e10c"
},
"name": "test case #1",
"price": 256,
"weapons": [
{
"weapon": {
"$oid": "59653bcfa9ac622e1913e10b"
},
"_id": {
"$oid": "59653bcfa9ac622e1913e10d"
}
},
{
"_id": {
"$oid": "59653d3279aeda2fda9fb490"
},
"weapon": {
"$oid": "59653c5d069f562eb0ba4ef3"
}
},
{
"_id": {
"$oid": "59653d38ba04de2fdddc459f"
},
"weapon": {
"$oid": "59653c893a772e2ef7b65a29"
}
}
],
"__v": 0
}
// opened
{
"_id": {
"$oid": "5965d134c8c95972a1a498f5"
},
"updatedAt": {
"$date": "2017-07-12T07:35:16.419Z"
},
"createdAt": {
"$date": "2017-07-12T07:35:16.419Z"
},
"user": {
"$oid": "5965d0d6ea9db872360db98b"
},
"weapon": {
"$oid": "59653bcfa9ac622e1913e10d"
},
"status": 0,
"sellPrice": null,
"__v": 0
}
// weapon
{
"_id": {
"$oid": "59653bcfa9ac622e1913e10b"
},
"name": "AWP | Fever Dream",
"price": 300,
"autoship": {
"status": true,
"price": 167,
"count": 5
},
"__v": 0
}
I need to get a list of open cases with weapons data.
opened -> cases -> weapon
So, I do this:
opened.find()
.populate('cases.weapons')
.then(_opened => {
console.log(_opened);
})
.catch(err => {
logger.error(err);
});
But populate does not work.

Answer 1

Unless I am mistaken, there is no relationship between openedSchema and casesSchema.
It is not opened -> cases -> weapon but opened -> weapon as openedSchema has no field called cases -- which means cases will never be populated.
Based on your schema definition, it should be opened.find().populate('weapon').