feathers-nedb-browser

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.