polymerfire based util to construct firebase nested and lookup datastructure
Please note that this component relies on yet unmerged PR to polymerfire, mainly https://github.com/firebase/polymerfire#234 (but also https://github.com/firebase/polymerfire#230 for performance and https://github.com/firebase/polymerfire#235). Those are merged under https://github.com/christophe-g/polymerfire#dev.
Example Usage:
This example first fetch all items under /countryList, and then add the code value lookup located at /countryNames/[[item.$key]]/country-code.
<firebase-app auth-domain="pre-ignition-meta.firebaseapp.com" database-url="https://pre-ignition-meta.firebaseio.com/" api-key="AIzaSyAbLJ5nMHaFS_YXioay8b28RnV43JvoEms">
</firebase-app>
<firebase-nest path="/countryList" data="{{data}}">
<template is="dom-repeat" items="[[data]]">
<firebase-value key="code" data="[[item]]" path="/countryNames/[[item.$key]]/country-code"></firebase-value>
</template>
</firebase-nest>