nolanlawson

it('update_seq persists', function(start) {
  var name = testHelpers.name;
  testUtils.initTestDB(name, function(err, db) {
    db.post({test:"somestuff"}, function (err, info) {
      new PouchDB(name, function(err, db) {
        db.info(function(err, info) {
          equal(info.doc_count, 2,  'Doc Count persists'); // should be 1
          start();
        });
      });

nolanlawson

Background

Security in a single CouchDB can only be set up to do either:

• Everyone can read/write everything (admin party)
• Everyone can read, some can write
• Some can read everything, and those same people can write everything

So in the very common situation where you want user data to be private, the current best practice is to give every user a database. This sounds nuts at first, but it turns out that databases are cheap in CouchDB; Cloudant boasts that 100k databases in a single Couch is not uncommon (source).

nolanlawson

#!/usr/bin/env python
#
# Prints the pouchdb.min.js and gzipped file sizes for 
# all PouchDB builds in the past several months.
#

import requests, zlib

def main():
  print 'Commit','GitHub link','Date','pouchdb.min.js size','gzipped size'

nolanlawson

Size-increasing

• 33649 : 0612e92
• 8169 : 35cd3ab
• 6159 : dac5ae3
• 4601 : 1e2601f
• 3457 : 7c1a7b2
• 3418 : 3595a65
• 1757 : bb1f30b

nolanlawson

    it('should handle user errors in reduce functions', function () {
      return new Pouch(dbName).then(function (db) {
        function getKey(row) {return row.key; }
        db.on('error', function () { /* noop */ });
        return createView(db, {
          map : function (doc) {
            emit(doc.name, doc.data);
          },
          reduce : function (keys, values) {
            return values[0].foo.bar;

nolanlawson

HTML5 Blob shim

Small JavaScript function that abstracts constructing a Blob object, so it works in older browsers that don't support the native Blob constructor (e.g. old versions of QtWebKit).

Usage

The function createBlob() simply replaces new Blob():

nolanlawson

PouchDB 2.2.0 performance report

TL;DR

PouchDB 2.2.0, which will be released in early May, will boast an 80x-100x speed improvement in query() calls in IndexedDB (Chrome, Firefox, IE) and a roughly 40x speed improvement in WebSQL (Safari, Cordova). This requires that you first save the view before querying (so it can be indexed), but we will provide sugar to make that easy.

The old-style query() calls with temporary views, however, will be up to 100x slower due to no longer being performed in-memory. So developers will need to upgrade carefully.

nolanlawson

PouchDB 2.3.0 index API proposal

Wherein we hack up our dream map/reduce API, slated to be introduced in PouchDB 2.3.0.

Basic

new PouchDB('mydb', {indexes: ['title']});

nolanlawson

var start = document.getElementById('start');
var stuff = document.getElementById('stuff');
var remote = new PouchDB('http://registry.npmjs.org/', {cache: true});
var local = new PouchDB('npm');
start.addEventListener('click', function (){
  remote.info().then(function (a) {
    return a.doc_count;
  }).then(function (count) {
     remote.replicate.to(local, {
       batch_size: 100

nolanlawson

openDatabase('mydatabase', 1, 'mydatabase', 5000000, function (db) {
  
  function onTransactionSuccess() {
    console.log('yay, transaction succeeded!');
  }
  function onTransactionError() {
    console.log('boo, transaction failed!');
  }
  
  db.transaction(function (tx) {