Xpresser XpressMongo Plugin

Xpress mongo is a light nodejs library for mongodb.

Installation

Install xpress-mongo && @xpresser/xpress-mongo plugin

npm i xpress-mongo @xpresser/xpress-mongo
# OR
yarn add xpress-mongo @xpresser/xpress-mongo

Setup

Add npm://@xpresser/xpress-mongo to plugins array in your plugins.json file.

Note: if you don't have plugins.json file in your project create one in your backend folder. backend/plugins.json

{
 "npm://@xpresser/xpress-mongo": true
}

Config

Add to your configuration using key mongodb, Example:

const config = {
 /**
  * If Enabled, xjs make:model will generate Models
  * that requires you to define all data types.
  */
 useStrictTypescriptModels: true, // >=v1.0.0
 
 // Connection Config
 mongodb: {
   url: 'mongodb://127.0.0.1:27017',
   database: 'test',
   options: {
     useNewUrlParser: true,
     useUnifiedTopology: true
   }
 }
};

Commands

npx xjs make:model <ModelName>

NOTE: This plugin modifies xpresser's default factory template for models.

Migration

To activate migration commands, add npm://@xpresser/xpress-mongo to the extensions array in your use-xjs-cli.json file.

Like so:

{
  "extensions": [
    "npm://@xpresser/xpress-mongo"
  ]
}

This will add the following commands to xjs cli.

# Make migration file
npx xjs make:migration <filename>

# Do migration
npx xjs migrate

# Undo migration
npx xjs migrate undo

Make migration file

To make a migration file, run the following command:

npx xjs make:migration <filename>

# Example
npx xjs make:migration add-users

This will create a migration file in your jobs/migrations folder. The file name will be prefixed with a timestamp. E.g 1610000000000__add-users, the timestamp is in milliseconds, it is used to order migrations.

The migration file should look like this:

import {defineMigrationJob} from "@xpresser/xpress-mongo";

export = defineMigrationJob((m) => {
    /**
     * Do Migration
     */
    m.do(async () => {
        // do migration code
    });

    /**
     * Undo Migration
     */
    m.undo(async () => {
        // undo migration code
    });
});

Do migration

To run the do function in your migration file, run the following command:

npx xjs migrate

This will run all migrations do functions that have not been run yet and save the migration to the database as a batch.

Undo migration

To run the undo function in your migration file, run the following command:

npx xjs migrate undo

This will run all migrations undo functions in the last batch and remove the batch from the database.

Do or Undo if condition is met

There is a doIf and undoIf method that can be used to run the do or undo function if a condition is met.

if doIf returns false the do function will be skipped same goes for undoIf and undo function.

Note: if there is no doIf or undoIf function, the do or undo function will be called.

import {defineMigrationJob} from "@xpresser/xpress-mongo";

export = defineMigrationJob((m) => {

    m.doIf(async () => {
        // return true to run `do` function
        // return false to skip `do` function
        return true;
    });


    m.undoIf(async () => {
        // return true to run `undo` function
        // return false to skip `undo` function
        return true;
    });

    /**
     * Do Migration
     */
    m.do(async () => {
        // do migration code
    });

    /**
     * Undo Migration
     */
    m.undo(async () => {
        // undo migration code
    });
});

Do or Undo a migration file.

In some cases you may want to run a migration file without relying on the database to keep track of migrations, you can call the do or undo function directly.

Since migration files are jobs, you can call them directly using the xjs cli.

# Do migration
npx xjs run migrations/<filename> do

# Undo migration
npx xjs run migrations/<filename> undo