model.js

require("ember-data/system/model/states");
require("ember-data/system/mixins/load_promise");

var LoadPromise = DS.LoadPromise; // system/mixins/load_promise

var get = Ember.get, set = Ember.set, map = Ember.EnumerableUtils.map;

var retrieveFromCurrentState = Ember.computed(function(key, value) {
  if (arguments.length > 1) {
    throw new Error('Cannot Set: ' + key + ' on: ' + this.toString() );
  }
  return get(get(this, 'stateManager.currentState'), key);
}).property('stateManager.currentState');

DS.Model = Ember.Object.extend(Ember.Evented, LoadPromise, {
  isLoaded: retrieveFromCurrentState,
  isReloading: retrieveFromCurrentState,
  isDirty: retrieveFromCurrentState,
  isSaving: retrieveFromCurrentState,
  isDeleted: retrieveFromCurrentState,
  isError: retrieveFromCurrentState,
  isNew: retrieveFromCurrentState,
  isValid: retrieveFromCurrentState,

  clientId: null,
  id: null,
  transaction: null,
  stateManager: null,
  errors: null,

  /**
    Create a JSON representation of the record, using the serialization
    strategy of the store's adapter.

    Available options:

    * `includeId`: `true` if the record's ID should be included in the
      JSON representation.

    @param {Object} options
    @returns {Object} an object whose values are primitive JSON values only
  */
  serialize: function(options) {
    var store = get(this, 'store');
    return store.serialize(this, options);
  },

  toJSON: function() {
    var serializer = DS.JSONSerializer.create();
    return serializer.serialize(this);
  },

  didLoad: Ember.K,
  didReload: Ember.K,
  didUpdate: Ember.K,
  didCreate: Ember.K,
  didDelete: Ember.K,
  becameInvalid: Ember.K,
  becameError: Ember.K,

  data: Ember.computed(function() {
    if (!this._data) {
      this.materializeData();
    }

    return this._data;
  }).property(),

  materializeData: function() {
    this.send('materializingData');

    get(this, 'store').materializeData(this);

    this.suspendRelationshipObservers(function() {
      this.notifyPropertyChange('data');
    });
  },

  _data: null,

  init: function() {
    this._super();

    var stateManager = DS.StateManager.create({ record: this });
    set(this, 'stateManager', stateManager);

    this._setup();

    stateManager.goToState('empty');
  },

  _setup: function() {
    this._relationshipChanges = {};
    this._changesToSync = {};
  },

  send: function(name, context) {
    return get(this, 'stateManager').send(name, context);
  },

  withTransaction: function(fn) {
    var transaction = get(this, 'transaction');
    if (transaction) { fn(transaction); }
  },

  loadingData: function() {
    this.send('loadingData');
  },

  loadedData: function() {
    this.send('loadedData');
  },

  didChangeData: function() {
    this.send('didChangeData');
  },

  setProperty: function(key, value, oldValue) {
    this.send('setProperty', { key: key, value: value, oldValue: oldValue });
  },

  /**
    Reload the record from the adapter.

    This will only work if the record has already finished loading
    and has not yet been modified (`isLoaded` but not `isDirty`,
    or `isSaving`).
  */
  reload: function() {
    this.send('reloadRecord');
  },

  deleteRecord: function() {
    this.send('deleteRecord');
  },

  unloadRecord: function() {
    Ember.assert("You can only unload a loaded, non-dirty record.", !get(this, 'isDirty'));

    this.send('unloadRecord');
  },

  clearRelationships: function() {
    this.eachRelationship(function(name, relationship) {
      if (relationship.kind === 'belongsTo') {
        set(this, name, null);
      } else if (relationship.kind === 'hasMany') {
        get(this, name).clear();
      }
    }, this);
  },

  updateRecordArrays: function() {
    var store = get(this, 'store');
    if (store) {
      store.dataWasUpdated(this.constructor, get(this, '_reference'), this);
    }
  },

  /**
    If the adapter did not return a hash in response to a commit,
    merge the changed attributes and relationships into the existing
    saved data.
  */
  adapterDidCommit: function() {
    var attributes = get(this, 'data').attributes;

    get(this.constructor, 'attributes').forEach(function(name, meta) {
      attributes[name] = get(this, name);
    }, this);

    this.send('didCommit');
    this.updateRecordArraysLater();
  },

  adapterDidDirty: function() {
    this.send('becomeDirty');
    this.updateRecordArraysLater();
  },

  dataDidChange: Ember.observer(function() {
    var relationships = get(this.constructor, 'relationshipsByName');

    this.updateRecordArraysLater();

    relationships.forEach(function(name, relationship) {
      if (relationship.kind === 'hasMany') {
        this.hasManyDidChange(relationship.key);
      }
    }, this);

    this.send('finishedMaterializing');
  }, 'data'),

  hasManyDidChange: function(key) {
    var cachedValue = this.cacheFor(key);

    if (cachedValue) {
      var type = get(this.constructor, 'relationshipsByName').get(key).type;
      var store = get(this, 'store');
      var ids = this._data.hasMany[key] || [];

      var references = map(ids, function(id) {
        // if it was already a reference, return the reference
        if (typeof id === 'object') { return id; }
        return store.referenceForId(type, id);
      });

      set(cachedValue, 'content', Ember.A(references));
    }
  },

  updateRecordArraysLater: function() {
    Ember.run.once(this, this.updateRecordArrays);
  },

  setupData: function(prematerialized) {
    this._data = {
      attributes: {},
      belongsTo: {},
      hasMany: {},
      id: null
    };
  },

  materializeId: function(id) {
    set(this, 'id', id);
  },

  materializeAttributes: function(attributes) {
    Ember.assert("Must pass a hash of attributes to materializeAttributes", !!attributes);
    this._data.attributes = attributes;
  },

  materializeAttribute: function(name, value) {
    this._data.attributes[name] = value;
  },

  materializeHasMany: function(name, ids) {
    this._data.hasMany[name] = ids;
  },

  materializeBelongsTo: function(name, id) {
    this._data.belongsTo[name] = id;
  },

  rollback: function() {
    this._setup();
    this.send('becameClean');

    this.suspendRelationshipObservers(function() {
      this.notifyPropertyChange('data');
    });
  },

  toStringExtension: function() {
    return get(this, 'id');
  },

  /**
    @private

    The goal of this method is to temporarily disable specific observers
    that take action in response to application changes.

    This allows the system to make changes (such as materialization and
    rollback) that should not trigger secondary behavior (such as setting an
    inverse relationship or marking records as dirty).

    The specific implementation will likely change as Ember proper provides
    better infrastructure for suspending groups of observers, and if Array
    observation becomes more unified with regular observers.
  */
  suspendRelationshipObservers: function(callback, binding) {
    var observers = get(this.constructor, 'relationshipNames').belongsTo;
    var self = this;

    try {
      this._suspendedRelationships = true;
      Ember._suspendObservers(self, observers, null, 'belongsToDidChange', function() {
        Ember._suspendBeforeObservers(self, observers, null, 'belongsToWillChange', function() {
          callback.call(binding || self);
        });
      });
    } finally {
      this._suspendedRelationships = false;
    }
  },

  becameInFlight: function() {
  },

  // FOR USE BY THE BASIC ADAPTER

  save: function() {
    this.get('store').scheduleSave(this);
  },

  // FOR USE DURING COMMIT PROCESS

  adapterDidUpdateAttribute: function(attributeName, value) {

    // If a value is passed in, update the internal attributes and clear
    // the attribute cache so it picks up the new value. Otherwise,
    // collapse the current value into the internal attributes because
    // the adapter has acknowledged it.
    if (value !== undefined) {
      get(this, 'data.attributes')[attributeName] = value;
      this.notifyPropertyChange(attributeName);
    } else {
      value = get(this, attributeName);
      get(this, 'data.attributes')[attributeName] = value;
    }

    this.updateRecordArraysLater();
  },

  _reference: Ember.computed(function() {
    return get(this, 'store').referenceForClientId(get(this, 'clientId'));
  }),

  adapterDidInvalidate: function(errors) {
    this.send('becameInvalid', errors);
  },

  adapterDidError: function() {
    this.send('becameError');
  },

  /**
    @private

    Override the default event firing from Ember.Evented to
    also call methods with the given name.
  */
  trigger: function(name) {
    Ember.tryInvoke(this, name, [].slice.call(arguments, 1));
    this._super.apply(this, arguments);
  }
});

// Helper function to generate store aliases.
// This returns a function that invokes the named alias
// on the default store, but injects the class as the
// first parameter.
var storeAlias = function(methodName) {
  return function() {
    var store = get(DS, 'defaultStore'),
        args = [].slice.call(arguments);

    args.unshift(this);
    Ember.assert("Your application does not have a 'Store' property defined. Attempts to call '" + methodName + "' on model classes will fail. Please provide one as with 'YourAppName.Store = DS.Store.extend()'", !!store);
    return store[methodName].apply(store, args);
  };
};

DS.Model.reopenClass({
  isLoaded: storeAlias('recordIsLoaded'),
  find: storeAlias('find'),
  all: storeAlias('all'),
  query: storeAlias('findQuery'),
  filter: storeAlias('filter'),

  _create: DS.Model.create,

  create: function() {
    throw new Ember.Error("You should not call `create` on a model. Instead, call `createRecord` with the attributes you would like to set.");
  },

  createRecord: storeAlias('createRecord')
});