Adding findOneOrCreate to a Mongoose model

Step one: Define your schema

import mongoose from 'mongoose';
const Schema = mongoose.Schema;
const mySchema = new Schema({
 title: {type: String, required: true},
 description: String
}, {collection: 'MyModel', timestamp: true});

Step two: Add a static method to your schema

mySchema.statics.findOneOrCreate = function findOneOrCreate(condition, doc) {
 const self = this;
 const newDocument = doc;
 return new Promise((resolve, reject) => {
 return self.findOne(condition)
 .then((result) => {
 if (result) {
 return resolve(result);
 }
 return self.create(newDocument)
 .then((result) => {
 return resolve(result);
 }).catch((error) => {
 return reject(error);
 })
 }).catch((error) => {
 return reject(error);
 })
 });
};

Step 3: Export your model

export default mongoose.model('MyModel', mySchema);

Originally published at medium.com on April 23, 2018.

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