Falcor Demo

This is the code for Auth0's Intro to Falcor article. In the tutorial, we cover how to:

Setup a Falcor model on the client and prime it with data
Use Falcor's JSON Graph to avoid having duplicate data
Setup a Falcor Router with Falcor Express
Do a basic search using a Falcor route

Installation

Clone the repo and then run:

npm install
node index.js

Navigate to localhost:3000

Important Snippets

A model cache can be setup on the front end with some data by using a new falcor.Model

var model = new falcor.Model({
  cache: {
    events: [
      {
        name: "ng-conf",
        description: "The world's best Angular Conference",
        stuff: "oh hey stuff",
        location: { city: "Salt Lake City", state: "Utah" }
      },
      {
        name: "React Rally",
        description: "Conference focusing on Facebook's React",
        location: { city: "Salt Lake City", state: "Utah" }
      },

...

We can then get some of the data by providing a set of JavaScript paths to the specific data we are looking for.

model
  // To get the values on the "location" object, we need to pass the paths for the
  // keys on that object
  .get(["events", {from: 0, to: 2}, ["name", "description", "location"],["city", "state"]])
  .then(function(response) {
    document.getElementById("event-data").innerHTML = JSON.stringify(response, null, 2);
  });

We can then move the data over the server to be served with falcor-express. We need to have express serve a model.json endpoint and return a new Router.

// We setup a model.json endpoint and pass it a dataSourceRoute which
// allows us to serve a router. Various route requests can be sent to the
// router to request whatever data is required
app.use('/model.json', falcorExpress.dataSourceRoute(function(req, res) {
  return new Router([
    {
      // Our route needs to match a pattern of integers that
      // are used as eventIds
      route: "events[{integers:eventIds}]['name', 'description', 'location']",
      get: function(pathSet) {
        
        var results = [];

        // Above we specified an eventIds identifier that is an
        // array of ids which we can loop over
        pathSet.eventIds.forEach(function(eventId) {

          // Next, an array of key names that map is held at pathSet[2]
          pathSet[2].map(function(key) {

            // We find the event the cooresponds to the current eventId
            var eventRecord = eventsData.events[eventId];

            // Finally we push a path/value object onto
            // the results array
            results.push({
              path: ['events', eventId, key], 
              value: eventRecord[key]
            });
          });          
        });

        return results;

...

License

MIT

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