PouchDB not syncing (Express set up)

[Alexandro Chen]

The following code initiates two databases: db and remotedb. Then, then when router.get('/projects', function(req, res) is called both databases should sync:

var express = require('express')
var _ = require('lodash')
var PouchDB = require('pouchdb')
var webpack = require('webpack')
var config = require('./webpack.dev.conf')

var app = express()
var compiler = webpack(config)


var db = new PouchDB('vuedb')
var remotedb = new PouchDB('http://localhost:5984/vuedb')


// handle fallback for HTML5 history API
app.use(require('connect-history-api-fallback')())


// serve webpack bundle output
app.use(require('webpack-dev-middleware')(compiler, {
  publicPath: config.output.publicPath,
  stats: {
    colors: true,
    chunks: false
  }
}))


// enable hot-reload and state-preserving
// compilation error display
app.use(require('webpack-hot-middleware')(compiler))


// get an instance of the express Router
var router = express.Router()


// handle PouchDB stuff
router.get('/projects', function(req, res) {
  console.log('DB:', db)
  console.log('REMOTE:', remotedb)

  if (remotedb) {
    db.sync(remotedb, {
      live: true,
      retry: true
    }).on('changed', function (info) {
      console.log('CHANGED', info)
    }).on('error', function (err) {
      console.log('ERROR', err)
    })
  }
})


// all of our routes will be prefixed with /api
app.use('/api', router)


app.listen(8080, 'localhost', function (err) {
  if (err) {
    console.log(err)
    return
  }
  console.log('Listening at http://localhost:8080')
})

console.log('DB:', db) and console.log('REMOTE:', remotedb) do log the databases:

DB: PouchDB {
  _db_name: 'vuedb',


REMOTE: PouchDB {
  _db_name: 'http://localhost:5984/vuedb',

However the databases don't sync, in fact, remotedb isn't created at all:

Why could be the cause? And how to fix it?

[Alexandro Chen]

**EDIT:**

PouchDB outputs this:

[info] GET
/vuedb/_changes?timeout=25000&style=all_docs&heartbeat=10000&since=0&limit=100
404 - 127.0.0.1

 

And this from time to time:

 

webpack: bundle is now VALID. (node) warning: possible EventEmitter
memory leak detected. 11 destroyed listeners added. Use
emitter.setMaxListeners() to increase limit. at PouchDB.addListener (events.js:239:17)
at PouchDB.once (events.js:265:8)
at new Changes$1 (/home/alex/node/project/node_modules/pouchdb/lib/index.js:703:6)

Maybe it reveals something?

[Nolan Lawson]

Did you ever figure this out? FWIW, pouchdb-server demonstrates how to get this working: https://github.com/pouchdb/pouchdb-server/blob/master/bin/pouchdb-server

Also in general I'd say I recommend just using pouchdb-server directly as a separate Node process instead of using express-pouchdb. Although it's nice to run everything in a single Node process, it's much more DIY than pouchdb-server is.