pouchdb.mapreduce.noeval

Fork of the PouchDB map/reduce project which avoids using eval(). Thus, it allows using PouchDB in environments with a strict policy against dynamic script evaluation, such as Chrome Packaged Apps or Adobe AIR runtime.

Note that this kind of treatment is not technically required for Chrome Extensions or (now deprecated) Chrome Apps using manifest in version 1. For these kind of applications, the content security policy can be relaxed. However, although this will allow you to use eval(), it also requires putting the page in a sandbox, which renders PouchDB unusable, since sandboxed pages don't have access to IndexedDB.

Using this plugin is effectively the only way to use PouchDB in a packaged app without putting the original MapReduce plugin in a sandbox and setting a wrapper around it to communicate with the rest of library via window.postMessage() calls.

This plugin works by running a simple regex over your map functions, so it only works for basic usages. The most complex kind of map function you can do is e.g.

function(doc) {
  if (doc.type === 'person') {
    emit(doc.name, 1);
  }
}

reduce functions are not supported. Your mileage may vary; this is mostly a quick-and-dirty solution so you can start using things like design docs for secondary indexes (which require string evaluation; there's no way around it).

This plugin will also fall back to the regex only if eval() throws an error, so you can still use it as-is in environments that support eval().

Note, this plugin is not required when using temporary views (see query closures).

Usage

To use this plugin, include it after pouchdb.js in your HTML page:

<script src="pouchdb.js"></script>
<script src="pouchdb.mapreduce.noeval.js"></script>

This plugin is also available from Bower:

bower install pouchdb.mapreduce.noeval

Or to use it in Node.js, just npm install it:

npm install pouchdb.mapreduce.noeval

And then attach it to the PouchDB object:

var PouchDB = require('pouchdb');
PouchDB.plugin(require('pouchdb.mapreduce.noeval'));

Building

npm run build

Testing

In Node

Run tests with npm test and coverage of tests with npm test --coverage install dependencies with npm install

If you have mocha installed globally you can run single test with:

TEST_DB=local mocha --reporter spec --grep search_phrase

In TEST_DB environment variable specify database that PouchDB should use (see package.json)

In the browser

Run npm run dev and then point your favorite browser to http://127.0.0.1:8001/test/index.html.