MongoDB.md

MongoDB adapter

This adapter gives access to MongoDB databases. It uses the official mongodb library.

Install

This module contains the source code of the adapter. You just need to install the dependent library.

npm install mongodb@^4.1.4

Usage

Use the default localhost URI

If you not define any options, the adapter uses the "mongodb://localhost:27017" connection string.

// posts.service.js
const DbService = require("@moleculer/database").Service;

module.exports = {
    name: "posts",
    mixins: [DbService({ 
        adapter: { type: "MongoDB" }
    })]
}

With options

// posts.service.js
const DbService = require("@moleculer/database").Service;

module.exports = {
    name: "posts",
    mixins: [DbService({ 
        adapter: { 
            type: "MongoDB",
            options: {
                uri: "mongodb+srv://server_name:27017/?maxPoolSize=20",
                mongoClientOptions: {
                    auth: {
                        username: "user",
                        password: "secret"
                    }
                }
            }
        }
    })]
}

Options

Property	Type	Default	Description
uri	String	"mongodb://localhost:27017"	MongoDB connection URI.
mongoClientOptions	Object	null	Available options: https://mongodb.github.io/node-mongodb-native/4.1/interfaces/MongoClientOptions.html
dbOptions	Object	null	Available options: https://mongodb.github.io/node-mongodb-native/4.1/interfaces/DbOptions.html

Raw update

If you want to update entity and using raw changes, use the updateEntity method with { raw: true } options. In this case, you can use MongoDB update operators in the params parameter.

Example

const row = await this.updateEntity(ctx, {
    id: "YVdnh5oQCyEIRja0",

    $set: {
        status: false,
        height: 192
    },
    $inc: {
        age: 1
    },
    $unset: {
        dob: true
    }
}, { raw: true });

Additional methods

stringToObjectID

stringToObjectID(id: any): ObjectID|any

This method convert the id parameter to ObjectID if the id is String as a valid ObjectID hex string. Otherwise returns the intact id value.

objectIDToString

objectIDToString(id: ObjectID): String

This method convert the id parameter which is an ObjectID to String.