MongoDB Linking a $jsonSchema to another $jsonSchema - mongodb

Question

I have two schemas with 1 to N relation. one is book and the other author.
I have crated three files names: book.js, genre.js and author.js below. As you see, I have referenced in the book the genre and author from other files.
author: {
$ref: "./models/author.js"
},
and
"genre" : {
$ref: "./models/genre.js",
description: "must be a string and is required"
}
However, When I issue that in mongo> i get the following:
{
"ok" : 0,
"errmsg" : "$jsonSchema keyword '$ref' is not currently supported",
"code" : 9,
"codeName" : "FailedToParse"
}
I was wondering How I could do that please?
// book.js
var book = {
validator: {
$jsonSchema: {
bsonType: "object",
required: [ "title", "author", "summary", "isbn", "genre" ],
properties: {
title: {
bsonType: "string",
description: "must be a string and is required"
},
author: {
$ref: "./models/author.js"
},
isbn: {
bsonType: "int",
minimum: 2017,
maximum: 3017,
exclusiveMaximum: false,
description: "must be an integer in [ 2017, 3017 ] and is required"
},
"summary" : {
bsonType: "string",
description: "must be a string and is required"
},
"genre" : {
$ref: "./models/genre.js"
}
}
}
}
};
module.exports = book;
//genre.js
var genre = {
validator: {
$jsonSchema: {
bsonType: "object",
required: [ "name"],
properties: {
first_name: {
bsonType: "string",
size: 100,
description: "must be a string and is required"
},
url: {
bsonType: "string",
minLength:3,
maxLength:20,
description: "must be a string and size between [3, 100] is not required"
}
}
}
}
};
module.exports = genre;
//author.js
var Author = {
validator: {
$jsonSchema: {
bsonType: "object",
required: [ "first_name", "family_name" ],
properties: {
first_name: {
bsonType: "string",
maxLength:100,
description: "must be a string and is required"
},
family_name: {
bsonType: "string",
maxLength:100,
description: "must be a string and is not required"
},
date_of_birth: {
bsonType: "int",
minimum: 0,
maximum: 2018,
exclusiveMaximum: false,
description: "must be an integer in [ 0, 3017 ] and is required"
},
date_of_death: {
bsonType: "int",
minimum: 0,
maximum: 2018,
exclusiveMaximum: false,
description: "must be an integer in [ 0, 2018 ] and is required"
}
}
}
}
};
module.exports = Author;
It seems the Manual References does not work:
$jsonSchema: {
bsonType: "object",
required: [ "title", "author_id", "summary", "isbn", "genre" ],
properties: {
title: {
bsonType: "string",
description: "must be a string and is required"
},
author_id: {
bsonType: ObjectId(),
description: "must be a string and is required"
},
isbn: {
as
{
"ok" : 0,
"errmsg" : "$jsonSchema keyword 'bsonType' must be either a string or an array of strings",
"code" : 14,
"codeName" : "TypeMismatch"
}

Answer 1

"$jsonSchema keyword '$ref' is not currently supported",
As per the error message you encountered, the implementation of JSON Schema does not (as at MongoDB 4.0) support references ($ref). Since $jsonSchema is being validated on the database server a relative file path isn't appropriate; you should instead inline the required schema validation rules.
If you want more flexibility you could look for a validation library you can use in your application code. There are several JSON Schema packages on NPM as well as alternative approaches such as Object-Document Mappers (for example, Mongoose).
It seems the Manual References does not work
bsonType: ObjectId(),
The ObjectId() usage here isn't valid JSON. You need to specify a string value with the BSON type: bsonType: "objectId".
For more information see $jsonSchema Extensions and Omissions in the MongoDB documentation for your server version.

Answer 2

Thank you very much. bsonType: "objectId". To be honest with you, I don't like using Mongoose. Using manual referencing:
original_author_id = ObjectId()
db.author.insert({
"_id": original_author_id,
first_name: "ghadamali",
family_name: "sarami",
date_of_birth: NumberInt(1944)
});
original_genre_id = ObjectId()
db.genre.insert({
"_id": original_genre_id,
name: "action",
url: "www.action.com"
});
db.book.insert({
title:"az range gol",
author_id: original_author_id,
summary: "shekle senasi shahname",
isbn: NumberInt(12312),
genre:original_genre_id
});