feathers-nedb

feathers-nedb is a database service adapter for NeDB, an embedded datastore with a MongoDB like API. NeDB can store data in-memory or on the filesystem which makes it useful as a persistent storage without a separate database server.

$ npm install --save @seald-io/nedb feathers-nedb

Important: feathers-nedb implements the Feathers Common database adapter API and querying syntax.

API

service(options)

Returns a new service instance initialized with the given options. Model has to be an NeDB database instance.

const NeDB = require('@seald-io/nedb');
const service = require('feathers-nedb');

// Create a NeDB instance
const Model = new NeDB({
  filename: './data/messages.db',
  autoload: true
});

app.use('/messages', service({ Model }));
app.use('/messages', service({ Model, id, events, paginate }));

Options:

• Model (required) - The NeDB database instance. See the NeDB API for more information.
• id (optional, default: '_id') - The name of the id field property. By design, NeDB will always add an _id property.
• events (optional) - A list of custom service events sent by this service
• paginate (optional) - A pagination object containing a default and max page size
• whitelist (optional) - A list of additional query parameters to allow (e.g. [ '$regex' ])
• multi (optional) - Allow create with arrays and update and remove with id null to change multiple items. Can be true for all methods or an array of multi methods (e.g. [ 'remove', 'create' ])

params.nedb

When making a service method call, params can contain an nedb property which allows to pass additional NeDB options, for example to allow upsert:

app.service('messages').update('someid', {
  text: 'This message will be either created or updated'
}, {
  nedb: { upsert: true }
});

use of params on client

On client you can't pass anything other than a query as the parameter. So you need to do it like this.

// client side
app.service('messages').update('someid', {
  text: 'This message will be either created or updated'
}, {
  query: {nedb: { upsert: true }}
});

then add a hook to the service to move the nedb options to the params object

ctx => {
  const nedb = ctx.params.query.nedb;
  if (nedb) {
    ctx.params.nedb = nedb;
    delete ctx.params.query.nedb;
  }
  return ctx;
}

Example

Here is an example of a Feathers server with a messages NeDB service that supports pagination and persists to db-data/messages:

$ npm install @feathersjs/feathers @feathersjs/errors @feathersjs/express @feathersjs/socketio feathers-nedb nedb

In app.js:

const feathers = require('@feathersjs/feathers');
const express = require('@feathersjs/express');
const socketio = require('@feathersjs/socketio');

const NeDB = require('@seald-io/nedb');
const service = require('feathers-nedb');

const db = new NeDB({
  filename: './db-data/messages',
  autoload: true
});

// Create an Express compatible Feathers application instance.
const app = express(feathers());
// Turn on JSON parser for REST services
app.use(express.json());
// Turn on URL-encoded parser for REST services
app.use(express.urlencoded({extended: true}));
// Enable REST services
app.configure(express.rest());
// Enable Socket.io services
app.configure(socketio());
// Connect to the db, create and register a Feathers service.
app.use('/messages', service({
  Model: db,
  paginate: {
    default: 2,
    max: 4
  }
}));
// Set up default error handler
app.use(express.errorHandler());

// Create a dummy Message
app.service('messages').create({
  text: 'Message created on server'
}).then(message => console.log('Created message', message));

// Start the server.
const port = 3030;

app.listen(port, () => {
  console.log(`Feathers server listening on port ${port}`);
});

Run the example with node app and go to localhost:3030/messages.

License

Copyright (c) 2019

Licensed under the MIT license.