Simple JS data modeling

datamodel.js

var db = require('db');
var assert = require('assert');
var Q = require('q');

function hash() {
    // Hashing function used to make keys etc.
}

var Story = db.Model('Story', {
    title: db.StringProperty()
  , summary: db.StringProperty()
  , pub_date: db.IntegerProperty()
  , url: db.StringProperty({required: true})

  // Required function which creates a unique key for this model.
  // The returned key must be something sensible.
  , key: function (self) {
        return hash(self.url);
    }
});

var article = Story({title: 'Balmer fired from Microsoft'});

assert.equal(article.title, 'Balmer fired from Microsoft');
assert.equal(typeof article.summary, 'undefined');

article.pub_date = new Date().getTime();

// Methods are called by their string names, keeping the namespace open for
// more properties and the implementation simpler.
var json_repr = article('json'); // Output JSON representation.

// Async actions return a promise.
Q.when(article('put'), function (article) {
    console.log('article has been written to disk');

    key = article('key'); // Special method to get a key

    // Output the key string to the UI or something
});


// Some time later you can do a get by key

var key;

var article = db.get(key);

// Properties are just properties.
assert.equal(article.pubdate, 1234567890);


// Queries

// Get a query object and call methods on it. It works like jQuery.
var query = db.Query()
    // The type name passed as the first argument to the model when this entity was created.
    .type('Story')
    // Check for a property and get a pointer to it.
    .has('pub_date')
    // The greater than function
    .gt(1234567790);

// Query ojects will need an index created for them before they execute, or
// create one on the fly if one does not already exist.

Q.when(query.fetch(), function (results) {
    assert.ok(Array.isArray(results));
});