data.js

/**
 * Seed Function
 * (sails.config.bootstrap)
 *
 * A function that runs just before your Sails app gets lifted.
 * > Need more flexibility?  You can also create a hook.
 *
 * For more information on seeding your app with fake data, check out:
 * https://sailsjs.com/config/bootstrap
 */

module.exports.bootstrap = async function() {
  // Import dependencies
  var path = require('path');

  // This bootstrap version indicates what version of fake data we're dealing with here.
  var BOOTSTRAP_VERSION = 1;

  // This path indicates where to store/look for the JSON file that tracks the "last run bootstrap info"
  var bootstrapLastRunInfoPath = path.resolve(sails.config.appPath, '.tmp/bootstrap-version.json');

  // Whether or not to continue doing the stuff in this file (i.e. wiping and regenerating data)
  // depends on some factors:
  // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

  // If the bootstrap version has been changed, then run the seed data again
  if (await sails.helpers.fs.exists(bootstrapLastRunInfoPath)) {
    let lastRunBootstrapInfo = await sails.helpers.fs.readJson(bootstrapLastRunInfoPath);
    if (lastRunBootstrapInfo.version === BOOTSTRAP_VERSION) {
      sails.log('Skipping v'+BOOTSTRAP_VERSION+' bootstrap seed data because it was already run');
      return;
    }
  }

  // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

  // Otherwise, we're running the bootstrap for the first time, or it's a new version
  sails.log('Running v'+BOOTSTRAP_VERSION+' bootstrap seed data...');

  // Add seed data below
  // -----------------

  // Example for a Book model:
  await Book.createEach([
    { title: 'The Great Gatsby', author: 'F. Scott Fitzgerald', year: 1925 },
    { title: 'To Kill a Mockingbird', author: 'Harper Lee', year: 1960 },
    { title: '1984', author: 'George Orwell', year: 1949 },
    { title: 'The Catcher in the Rye', author: 'J.D. Salinger', year: 1951 },
  ]);

  // Save the bootstrap version
  await sails.helpers.fs.writeJson.with({
    destination: bootstrapLastRunInfoPath,
    json: { version: BOOTSTRAP_VERSION },
    force: true
  });
};