fireball-db/lib/instance.js

a lightweight model wrapper for DynamoDB

var Instance, assign, fn, func, i, len, patch, ref,
  extend = function(child, parent) { for (var key in parent) { if (hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; },
  hasProp = {}.hasOwnProperty;

assign = require('lodash').assign;

patch = require('./update_builder').patch;

Instance = (function() {
  function Instance(data) {
    assign(this, data);
  }

  Instance.prototype.key = function() {
    return this._model().key_schema.key_for(this);
  };

  Instance.prototype.refresh = function(params) {
    return this._model().get(this.key(), params);
  };

  Instance.prototype.patch = function(changes, params) {
    var Model;
    if (params == null) {
      params = {};
    }
    Model = require('./model');
    assign(params, patch(changes));
    return this._model().update(this.key(), params);
  };

  Instance.prototype.toString = function() {
    var key, ref, ref1, value, values;
    values = [];
    ref = this;
    for (key in ref) {
      value = ref[key];
      if (this.hasOwnProperty(key)) {
        values.push(key + ": '" + value + "'");
      }
    }
    values = values.join(',');
    return "Instance[" + ((ref1 = this._model()) != null ? ref1.name : void 0) + "](" + values + ")";
  };

  Instance.extend_with = function(model) {
    var extension;
    if (model == null) {
      throw new Error("Instance extensions require model!");
    }
    extension = (function(superClass) {
      extend(_Class, superClass);

      function _Class() {
        return _Class.__super__.constructor.apply(this, arguments);
      }

      return _Class;

    })(Instance);
    extension.model = model;
    return extension;
  };

  Instance.prototype._model = function() {
    return this.constructor.model;
  };

  return Instance;

})();

ref = ['put', 'delete', 'update'];
fn = function(func) {
  return Instance.prototype[func] = function(params) {
    return this.constructor.model[func](this, params);
  };
};
for (i = 0, len = ref.length; i < len; i++) {
  func = ref[i];
  fn(func);
}

module.exports = Instance;