Seeding mongoDB data in node.js by referencing ObjectId - node.js

Question

i'm using mongoose-data-seed to seed data into mongodb, however it has no mechanism to allow passing of ObjectId() as references to other seed files

Answer 1

I found a way to store the output of each of the seeders in a json file and retrieve the ObjectIds from the previous seeds to use in the current seeder. This way i can reference ObjectIds from previous seeders.
seeding-helper.js
const fs = require('fs');
// const path = require('path');
const seedersTmpDataFolder = 'seeders/bin';
class SeedingHelper {
static saveData(filename, data) {
return new Promise((resolve) => {
fs.writeFile(`${seedersTmpDataFolder}/${filename}.json`, JSON.stringify(data, null, '\t'), (err) => {
if (err) throw err;
resolve();
});
});
}
static readData(filename) {
return new Promise((resolve) => {
fs.readFile(`${seedersTmpDataFolder}/${filename}.json`, 'utf8', (err, data) => {
if (err) throw err;
resolve(JSON.parse(data));
});
});
}
}
module.exports = SeedingHelper;
resourceActions.seeder.js
const { Seeder } = require('mongoose-data-seed');
const mongoose = require('mongoose');
const ResourceAction = require('../models/resourceAction');
const SeedingHelper = require('../helpers/seeding-helper');
const { Types: { ObjectId } } = mongoose;
const data = [
{
_id: ObjectId(),
name: 'test1'
},
{
_id: ObjectId(),
name: 'test2'
},
];
class ResourceActionSeeder extends Seeder {
async shouldRun() { // eslint-disable-line class-methods-use-this
return ResourceAction.count().exec().then(count => count === 0);
}
async run() { // eslint-disable-line class-methods-use-this
let result;
await SeedingHelper.saveData('resourceActions', data)
.then(() => {
result = ResourceAction.create(data);
});
return result;
}
}
module.exports = ResourceActionSeeder;
resources.seeder.js
const { Seeder } = require('mongoose-data-seed');
const mongoose = require('mongoose');
const Resource = require('../models/resource');
const SeedingHelper = require('../helpers/seeding-helper');
const { Types: { ObjectId } } = mongoose;
class ResourcesSeeder extends Seeder {
async shouldRun() { // eslint-disable-line class-methods-use-this
return Resource.count().exec().then(count => count === 0);
}
async run() { // eslint-disable-line class-methods-use-this
let result;
await SeedingHelper.readData('resourceActions')
.then((resourceActionsData) => {
const machinesId = ObjectId();
const actionTest1 = ObjectId(resourceActionsData.find(x => x.name === 'test1')._id);
const actionTest2 = ObjectId(resourceActionsData.find(x => x.name === 'test2')._id);
const data = [
{
_id: machinesId,
name: 'machines',
actions: [
actionTest1,
actionTest2,
],
},
];
result = Resource.create(data);
if (result) SeedingHelper.saveData('resources', data);
});
return result;
}
}
module.exports = ResourcesSeeder;