orm.js

orm.js

if (typeof Object.create !== "function")
    Object.create = function(o) {
      function F() {}
      F.prototype = o;
      return new F();
    };

var Model = {
  init: function(){ },
  
  prototype: {
    init: function(){}
  },
  
  create: function(){
    var object = Object.create(this);
    object.parent = this;
    object.init.apply(object, arguments);
    return object;
  },
  
  inst: function(){
    var instance = Object.create(this.prototype);
    instance.parent = this;
    instance.init.apply(instance, arguments);
    return instance;
  },
  
  extend: function(o){
    jQuery.extend(this, o);
  },
  
  include: function(o){
    jQuery.extend(this.prototype, o);
  }
};

Model.proxy = Model.prototype.proxy = function(func){
  var thisObject = this;
  return(function(){ 
    return func.apply(thisObject, arguments); 
  });
};

Model.extend({
  init: function(){
    this.records = {};
    this.attributes = [];
  },
  
  find: function(id){
    var record = this.records[id];
    if ( !record ) throw("Unknown record");
    return record.dup();
  },
  
  populate: function(values){
    // Reset model & records
    this.init();
    
    for (var i=0, il = values.length; i < il; i++) {    
      var record = this.inst(values[i]);
      record.newRecord = false;
      this.records[record.id] = record;
    }
  }
});

Model.include({
  newRecord: true,

  init: function(atts){
    if (atts) this.load(atts);
  },
  
  load: function(attributes){
    for(var name in attributes)
      this[name] = attributes[name];
  },
  
  attributes: function(){
    var result = {};
    for(var i in this.parent.attributes) {
      var attr = this.parent.attributes[i];
      result[attr] = this[attr];
    }
    result.id = this.id;
    return result;
  },
  
  create: function(){
    this.newRecord = false;
    this.parent.records[this.id] = this.dup();
  },
  
  update: function(){
    this.parent.records[this.id] = this.dup();
  },
  
  save: function(){
    this.newRecord ? this.create() : this.update();            
  },
  
  destroy: function(){
    delete this.parent.records[this.id];
  },
  
  dup: function(){
    return jQuery.extend(true, {}, this);
  },
  
  toJSON: function(){
    return(JSON.stringify(this.attributes()));
  }
});

var Asset = Model.create("Asset");
var Person = Model.create("Person");

var asset = Asset.inst({id: 1});