Seed your database with Sequelize.
Add initial data to your database so that you don't need to create dummy data each time you boot up your app in development.
You can also use this when running end-to-end tests since you'll need consistent data to test against.
Typically you want to seed your database before your express or other app begins. This means it needs to sit in between the spot where you define your sequelize models and where you serve your app.
NOTE: You also will want to make sure that you don't run this in production since it will remove all the data. :)
npm install seedquelize --save-dev
This example shows how to use seedquelize with express sequelize and postgres. It uses the following npm modules which you will have to install on your own: express, body-parser, sequelize and pg as dependencies and seedquelize and dotenv-safe as dev dependencies. You will need to npm install all of those dependencies for this example to work. You can also check out the examples directory.
Your database config info should be in a .env file. I've commented this file as much as possible to show how to use seeding in an actual app. Pull requests are welcome in order to make this more clear.
let seed;
if(process.env.NODE_ENV !== 'production') {
require('dotenv-safe').config() // environment variables, used for hiding secrets
seed = require('seedquelize')
}
const express = require('express')
const bodyParser = require('body-parser')
const Sequelize = require('sequelize')
// Connect to a sql database
const sequelize = new Sequelize(process.env.DATABASE_URL)
const Artist = sequelize.define('artist', {
name: {
type: Sequelize.STRING,
field: 'name'
},
genre: {
type: Sequelize.STRING,
field: 'genre'
}
})
const User = sequelize.define('user', {
username: {
type: Sequelize.STRING,
field: 'username'
},
twitter: {
type: Sequelize.STRING,
field: 'twitter'
}
})
// This line saves your job by not deleting production data
if(process.env.NODE_ENV !== 'production') {
// Clear out the existing database
sequelize.sync({force: true}).then(() => {
// This shows the shape of the structure we are expecting.
// data is just an array of whatever models you want to create,
// model is of course the actual model you want created
const artists = {
data: [
{
name: 'Andrea Bocelli',
genre: 'Opera'
},
{
name: 'Britney Spears',
genre: 'Pop'
},
{
name: 'Lee Morgan',
genre: 'Jazz'
}
],
model: Artist
}
const users = {
data: [
{
username: 'jimthedev',
twitter: '@jimthedev'
},
{
username: 'jnessview',
twitter: 'JNessView'
}
],
model: User
}
// Actually seed the database using seedquelize
seed([
artists,
users
]).then(() =>{
// Only started after seeding in dev/test
startExpress();
})
})
} else {
// Started right away in prod
startExpress();
}
function startExpress() {
// Create a new express app to server our api
var app = express()
// Teach express how to parse requests of type application/json
//
app.use(bodyParser.json());
// Teach express how to parse requests of type application/x-www-form-urlencoded
//
app.use(bodyParser.urlencoded({ extended: true }));
app.get('/api/artists', (req, res) => {
Artist.findAll().then((artists) => {
res.json(artists);
})
})
app.get('/api/users', (req, res) => {
User.findAll().then((users) => {
res.json(users);
})
})
// Determine which port to listen on
const port = process.env.PORT ? process.env.PORT : 3001
// Actually start the server
app.listen(port, () => {
console.log('Example app listening on port ' + port + '!')
})
}
Author: Jim Cummins <[email protected]> © 2017
License: MIT - do anything with the code, but don't blame me if it does not work.
Support: if you find any problems with this module, email / tweet / open issue on Github
Copyright (c) 2017 Jim Cummins <[email protected]>
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.