javascript - Mongoose - Create document if not exists, otherwise, update- return document in either case

Javascript - Mongoose - Create document if not exists, otherwise, update- return document in either case

In Mongoose, you can achieve creating a document if it doesn't exist and updating it if it does exist using the findOneAndUpdate() method with the upsert: true option. To ensure that the returned document reflects the updated state after the operation, you can set the new: true option. Here's how you can do it:

const mongoose = require('mongoose'); // Connect to MongoDB mongoose.connect('mongodb://localhost:27017/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true }); const db = mongoose.connection; // Define schema const userSchema = new mongoose.Schema({ username: String, email: String }); // Define model const User = mongoose.model('User', userSchema); async function findOrCreateAndUpdateUser(query, update) { try { // Find and update document if it exists, otherwise create a new one const options = { upsert: true, new: true }; const result = await User.findOneAndUpdate(query, update, options); console.log('Result:', result); } catch (error) { console.error('Error:', error); } finally { // Close the connection db.close(); } } // Example usage const query = { username: 'john' }; const update = { email: 'john@example.com' }; findOrCreateAndUpdateUser(query, update);

In this example:

  • We define a userSchema schema and create a User model based on that schema.
  • The findOrCreateAndUpdateUser function takes a query object and an update object as parameters.
  • Inside the function, we use findOneAndUpdate() to find a document matching the query. If a document is found, it is updated with the specified update. If no document is found, a new document is created with the specified query and update.
  • The options object specifies upsert: true to enable upserting (creating if not exists, updating if exists), and new: true to return the modified document.
  • The result of the operation is logged to the console.
  • Finally, we close the database connection after the operation completes.

Make sure to replace the MongoDB connection URI ('mongodb://localhost:27017/mydatabase') and the schema fields (username, email) with your actual values.

Examples

  1. "JavaScript check if document exists in Mongoose"

    • Description: This query is about verifying if a document exists in a MongoDB collection using Mongoose in a JavaScript environment.
    const DocumentModel = require('./models/Document'); DocumentModel.exists({ /* your conditions here */ }) .then(exists => { if (exists) { console.log('Document exists'); } else { console.log('Document does not exist'); } }) .catch(err => console.error(err));

  2. "Mongoose findOneAndUpdate if document exists"

    • Description: This query focuses on using Mongoose to find a document and update it if it exists in the database.
    DocumentModel.findOneAndUpdate( { /* your conditions here */ }, { /* update fields and values */ }, { new: true, upsert: true, runValidators: true } ) .then(updatedDocument => { console.log('Updated document:', updatedDocument); }) .catch(err => console.error(err));

  3. "JavaScript Mongoose create document if not exists"

    • Description: This query deals with creating a document if it doesn't already exist in a MongoDB collection using Mongoose.
    DocumentModel.findOneAndUpdate( { /* your conditions here */ }, { /* new document fields and values */ }, { new: true, upsert: true, runValidators: true } ) .then(createdDocument => { console.log('Created document:', createdDocument); }) .catch(err => console.error(err));

  4. "Mongoose upsert document example"

    • Description: This query seeks an example of performing an upsert operation (update or insert) using Mongoose.
    DocumentModel.updateOne( { /* your conditions here */ }, { /* update fields and values */, { upsert: true }} ) .then(result => { console.log('Upsert result:', result); }) .catch(err => console.error(err));

  5. "JavaScript Mongoose findOne and create document"

    • Description: This query aims to find a document and create it if it doesn't exist in the MongoDB collection using Mongoose.
    DocumentModel.findOne({ /* your conditions here */ }) .then(existingDoc => { if (!existingDoc) { return DocumentModel.create({ /* new document fields and values */ }); } else { console.log('Document already exists:', existingDoc); return existingDoc; } }) .then(createdOrExistingDoc => { console.log('Document:', createdOrExistingDoc); }) .catch(err => console.error(err));

  6. "Mongoose findOneOrCreate example"

    • Description: This query looks for an example of a findOneOrCreate method implementation using Mongoose.
    async function findOneOrCreate(condition, newDoc) { const existingDoc = await DocumentModel.findOne(condition); if (existingDoc) { return existingDoc; } else { return DocumentModel.create(newDoc); } } findOneOrCreate({ /* your conditions here */ }, { /* new document fields and values */ }) .then(createdOrExistingDoc => { console.log('Document:', createdOrExistingDoc); }) .catch(err => console.error(err));

  7. "JavaScript Mongoose insert if not exists"

    • Description: This query looks for a way to insert a document if it doesn't exist using Mongoose in a JavaScript application.
    DocumentModel.findOne({ /* your conditions here */ }) .then(existingDoc => { if (!existingDoc) { return DocumentModel.create({ /* new document fields and values */ }); } else { console.log('Document already exists:', existingDoc); return existingDoc; } }) .then(createdOrExistingDoc => { console.log('Document:', createdOrExistingDoc); }) .catch(err => console.error(err));

  8. "Mongoose create document if not exists and update if exists"

    • Description: This query asks for a method to create a document if it doesn't exist and update it if it does using Mongoose.
    DocumentModel.findOneAndUpdate( { /* your conditions here */ }, { /* update fields and values */ }, { new: true, upsert: true, runValidators: true } ) .then(updatedDocument => { console.log('Updated document:', updatedDocument); }) .catch(err => console.error(err));

  9. "JavaScript Mongoose findOrCreate example"

    • Description: This query seeks an example implementation of a findOrCreate function using Mongoose in JavaScript.
    async function findOrCreate(condition, newDoc) { const existingDoc = await DocumentModel.findOne(condition); if (existingDoc) { return existingDoc; } else { return DocumentModel.create(newDoc); } } findOrCreate({ /* your conditions here */ }, { /* new document fields and values */ }) .then(createdOrExistingDoc => { console.log('Document:', createdOrExistingDoc); }) .catch(err => console.error(err));

  10. "Mongoose findOneOrCreate vs updateOne upsert"

    • Description: This query compares the findOneOrCreate approach with updateOne upsert operation in Mongoose.
    // findOneOrCreate approach async function findOneOrCreate(condition, newDoc) { const existingDoc = await DocumentModel.findOne(condition); if (existingDoc) { return existingDoc; } else { return DocumentModel.create(newDoc); } } findOneOrCreate({ /* your conditions here */ }, { /* new document fields and values */ }) .then(createdOrExistingDoc => { console.log('Document:', createdOrExistingDoc); }) .catch(err => console.error(err)); // updateOne upsert approach DocumentModel.updateOne( { /* your conditions here */ }, { /* update fields and values */ }, { upsert: true } ) .then(result => { console.log('Upsert result:', result); }) .catch(err => console.error(err));

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