This document provides code examples for using PouchDB, an open-source JavaScript database, to set up a local database, synchronize it with a remote CouchDB database, handle conflicts, and implement messaging through document publishing and subscriptions. It includes snippets for installing PouchDB, initializing a database, syncing with options to handle changes live and errors, resolving conflicts by selecting a revision, and handling message documents with a specific channel through putting and logging documents.

1. Your devices deserve more than your files

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11. Setup
<script src="pouchdb.min.js"></script>
$ npm install pouchdb ­­save
var pouchdb = require('pouchdb');

12. Synchronization
var db = new PouchDB('todos');
var remoteCouch = 'https://mycouch/todos';
var opts = {live: true};
db.sync(remoteCouch, opts)
.on('change', onChange)
.on('uptodate', onUpdate)
.on('error', onError);

13. Conflicts
var opts = {conflicts: true};
db.get('docid', opts, function (err, doc) {
var rev = doc._rev;
var conflictRev = doc._conflicts[0];
rev = selectRevision(rev, conflictRev);
opts = {rev: rev};
db.get('docid', opts, function (err, doc) {
db.put(doc);
});
};

14. Messaging (pub/sub)
function onChange (change) {
if(change.doc.type === 'message'
&& change.doc.chan === 'mychan') {
console.log(doc.content);
db.put({
type: 'message',
content: 'Got it! Now I publish'
});
}

15. pouchdb.com
pouchdb/pouchdb
pouchdb/pouchdb-server
colinskow/pouch-mirror
natevw/PeerPouch
cozy-labs/[mobile|desktop]