atlas-provider-sequelize

Load Sequelize models into an Atlas project.

Use-cases

1. Declarative migrations - use a Terraform-like atlas schema apply --env sequelize to apply your Sequelize schema to the database.
2. Automatic migration planning - use atlas migrate diff --env sequelize to automatically plan a migration from the current database version to the Sequelize schema.

Installation

Install Atlas from macOS or Linux by running:

curl -sSf https://atlasgo.sh | sh

See atlasgo.io for more installation options.

Install the provider by running:

npm i @ariga/atlas-provider-sequelize

Make sure all your Node dependencies are installed by running:

npm i

Standalone

If all of your Sequelize models exist in a single Node module, you can use the provider directly to load your Sequelize schema into Atlas.

In your project directory, create a new file named atlas.hcl with the following contents:

data "external_schema" "sequelize" {
  program = [
    "npx",
    "@ariga/atlas-provider-sequelize",
    "load",
    "--path", "./path/to/models",
    "--dialect", "mysql", // mariadb | postgres | sqlite | mssql
  ]
}

env "sequelize" {
  src = data.external_schema.sequelize.url
  dev = "docker://mysql/8/dev"
  migration {
    dir = "file://migrations"
  }
  format {
    migrate {
      diff = "{{ sql . \"  \" }}"
    }
  }
}

As JS Script

If you want to use the provider as JS script, you can use the provider as follows:

Create a new file named load.js with the following contents:

#!/usr/bin/env node

// require sequelize models you want to load
const user = require("./models/user");
const task = require("./models/task");
const loadModels = require("@ariga/atlas-provider-sequelize");

console.log(loadModels("mysql", user, task));

Next, in your project directory, create a new file named atlas.hcl with the following contents:

data "external_schema" "sequelize" {
    program = [
        "node",
        "load.js",
        "mysql"
    ]
}

env "sequelize" {
    src = data.external_schema.sequelize.url
    dev = "docker://mysql/8/dev"
    migration {
        dir = "file://migrations"
    }
    format {
        migrate {
            diff = "{{ sql . \"  \" }}"
        }
    }
}

Usage

Once you have the provider installed, you can use it to apply your Sequelize schema to the database:

Apply

You can use the atlas schema apply command to plan and apply a migration of your database to your current Sequelize schema. This works by inspecting the target database and comparing it to the Sequelize schema and creating a migration plan. Atlas will prompt you to confirm the migration plan before applying it to the database.

atlas schema apply --env sequelize -u "mysql://root:password@localhost:3306/mydb"

Where the -u flag accepts the URL to the target database.

Diff

Atlas supports a version migration workflow, where each change to the database is versioned and recorded in a migration file. You can use the atlas migrate diff command to automatically generate a migration file that will migrate the database from its latest revision to the current Sequelize schema.

atlas migrate diff --env sequelize

Supported Databases

The provider supports the following databases:

• MySQL
• MariaDB
• PostgreSQL
• SQLite
• Microsoft SQL Server

Issues

Please report any issues or feature requests in the ariga/atlas repository.

License

This project is licensed under the Apache License 2.0.