This content originally appeared on DEV Community and was authored by Youssef
Mongogrator is a very fast database migration CLI for MongoDB. Its purpose is to easily create and run migrations for development and production stages
Installing
Using the following command, it will automatically download, install and add Mongogrator to PATH
MacOS/Linux
curl -fsSL git.new/mongogrator-installer.sh | bash
Windows
powershell -c "irm git.new/mongogrator-installer.ps1 | iex"
List of commands
Mongogrator CLI
Usage: mongogrator <command> [options]
Commands:
init [--js] Initialize a new configuration file
add Creates a new migration file with the provided name
list List all migrations and their status
migrate [config_path] Run all migrations that have not been applied yet
version, -v, --version Prints the current version of Mongogrator
Flags:
--help, -h Prints the detailed description of the command
Usage guide
A basic guide on how to use the CLI
Adding new migrations
Start by initializing the config file
mongogrator init
This initializes a mongogrator.config.ts file in the location of the command. You can optionally pass a --js flag at the end of the command to initialize in a js file
Setup the url to the desired mongo cluster, and make sure it's running
mongogrator add insert_user
This will create the migration file under the directory key assigned in the config migrationsPath
The following is an example of a newly created ts migration file
import type { Db } from 'mongodb'
/**
* This function is called when the migration is run.
* @param _db The mongodb database object that's passed to the migration
*/
export const migrate = async (_db: Db): Promise<void> => {
// Migration code here
}
The migrations are executed through the native MongoDB Node.js driver
Migration query example
import type { Db } from 'mongodb'
/**
* This function is called when the migration is run.
* @param _db The mongodb database object that's passed to the migration
*/
export const migrate = async (_db: Db): Promise<void> => {
// Migration code here
_db.collection('users').insertOne({ name: 'Alex' })
}
Migrations list
You can add as many migrations as you want and then call the list command to display the status of each
mongogrator list
This will print out a list of all the migrations, each has a status of either NOT MIGRATED or MIGRATED
┌───┬───────────────────────────────┬──────────────┐
│ │ migration │ status │
├───┼───────────────────────────────┼──────────────┤
│ 0 │ 20240923150201806_insert_user │ NOT MIGRATED │
└───┴───────────────────────────────┴──────────────┘
Naturally, the status will be NOT MIGRATED as we haven't run the migration yet
Running the migrations
Run the migrations simply by calling
mongogrator migrate
This will run all the migrations and log them to the database under the specified collection name in the config logsCollectionName
For production purposes, you can pass the config path to the migrate command directly if it's not accessible under the same path
mongogrator migrate /dist
Now if you run the list command again, it will reveal that the migration file has been successfully executed
┌───┬───────────────────────────────┬──────────────┐
│ │ migration │ status │
├───┼───────────────────────────────┼──────────────┤
│ 0 │ 20240923150201806_insert_user │ MIGRATED │
└───┴───────────────────────────────┴──────────────┘
Logs collection schema
{
_id: objectId(),
name: string,
createdAt: Date(),
}
Configuration
{
url: 'mongodb://localhost:27017', // Cluster url
database: 'test', // Database name for which the migrations will be executed
migrationsPath: './migrations', // Migrations directory relative to the location of the commands
logsCollectionName: 'migrations', // Name of the logs collection that will be stored in the database
format: 'ts', // Format type of the migration files ['ts', 'js']
}
all the config keys with path values are relative to the location of the config file itself
This content originally appeared on DEV Community and was authored by Youssef
Youssef | Sciencx (2024-10-01T15:54:54+00:00) Mongogrator – a MongoDB migration tool for TS & JS. Retrieved from https://www.scien.cx/2024/10/01/mongogrator-a-mongodb-migration-tool-for-ts-js/
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