rethinkdb-change-stream

Information

• Turns a RethinkDB change feed into a node stream.

Install

npm install rethinkdb-change-stream --save

API

changeStream(query)

• query argument is a rethinkdb query object
  • This can be from thinky, rethinkdb, or rethinkdbdash
• Returns a node.js Readable Stream
  • This stream can be piped anywhere you want, including http
  • Ending the stream will also end and clean up the change feed
  • If the change feed encounters an error, the stream will end
• Readable stream emits data events with two attributes:
  • type is either insert, update, or delete
  • data is an object with two possible fields:
    • prev exists if the type is update or delete
      • This is the old value that was removed or updated
    • next exists if the type is update or insert
      • This is the new value that was inserted or updated to
    • If using thinky, both prev and next will be instances of their Model class

Example (using thinky)

ES6

import changeStream from 'rethinkdb-change-stream'
import User from 'models/User'

// tail all 18 year olds named "Eric"
var query = User.filter({
  first_name: 'Eric',
  age: 18
}).changes()

var stream = changeStream(query)
stream.on('data', () => {
  // obj.type === insert, update, or delete
  // obj.data === object with prev and next objects
})

ES5

var changeStream = require('rethinkdb-change-stream');
var User = require('models/User');

// tail all 18 year olds named "Eric"
var query = User.filter({
  first_name: 'Eric',
  age: 18
}).changes();

var stream = changeStream(query);
stream.on('data', function(obj){
  // obj.type === insert, update, or delete
  // obj.data === object with prev and next objects
});