loopback-migration-tool

loopback-migration-tool expose the lb-migration script that ables you easy handle migrations and seeders for Loopback.io

Usage

Install Global

Install with Yarn

yarn global add loopback-migration-tool

or install with NPM

npm i -g loopback-migration-tool

Migrate all your models on all datasources.

lb-migration migrate

Migrate all your models on specific datasources.

lb-migration migrate --ds=datasource1 datasource2

Migrate specific models on specific datasources.

lb-migration migrate --ds=datasource1 datasource2 --model=model1 model2 model3

Migrate specific models using autoupdate method.

lb-migration migrate --model=model1 model2 model3 --method=update

Seed your models with files in ./seeds/*.js.

lb-migration seed

Seed your models with files in multiple locations.

lb-migration seed --src=path/to/files1/*.js path/to/files2/*.js path/to/files3/*.js  

Install as dev dependency

Install with Yarn

yarn add loopback-migration-tool --dev

or install with NPM

npm i loopback-migration-tool --save-dev

In your project root.

node_modules/.bin/lb-migration migrate [options] 

options

.lb-migrationrc.json

You can use a .lb-migrationrc.json to save your common migration settings.

Global options

Property	Description	Type	Values	Default	As argument
app	Path to your loopback application main file.	String		./server/server.js	-a --app --loopback-app

migrate

Important: Loopback's datasources uses two methods to migrate your models.

• Auto-migration: Drop existing schema objects if they exist, and re-create them based on model definitions. Existing data will be lost.
• Auto-update: Detect the difference between schema objects and model definitions, and alter the database schema objects. Keep existing data.

Be careful what method must you use.

Property	Description	Type	Values	Default	As argument
ds	Datasources that will be migrated. If empty or not present, all datasources will be migrates.	String, [String]		[]	-d --ds --datasource
model	Models in the selected datasources that will be migrated. If empty or not present, all models in all selected datasources will be migrates. Selected Models not presents in selected datasources will be not migrated.	[String]		[]	--mod --model
ignored-model	Models in the selected datasources that will be not migrated.	[String]		[]	--imod --ignored-model
method	Loopback migration method to use. Loopback uses automigrate and autoupdate methods for migrations.	String	update migrate	migrate	-m --method

seed

Important: seed command will destroy all existing models' data calling to destroyAll method before start to seed them.

Property	Description	Type	Values	Default	As argument
src	File glob to your seeders files.	String		"./seeds/*.js"	-s --src --sources

Seeder file

A seeder file is just a js module that exports a function where you fill your model's data. Seeder files are executed in lexicographic order.

The exported function receive a loopback-app instance as argument where you can find all the loopback app data, that includes the app.models object.

You can find a example here

./seeds/index.js

module.exports = function (app, cb) {
    let Travel = app.models.Travel

    let promises = _.map(data, function (entry) {
        let passengers = entry.passengers
        delete entry.passengers

        return Travel.create(entry)
            .then((travel) => travel.passengers.create(passengers))
    })

    return Promise.all(promises) //Or you can use cb argument when all is done, but not both.
}