Universal edit controller mixin for ember.js. Use on all controllers that create, update and delete records.

ember.editControllerMixin.js

// Mixin to generalize model create/edit functionality
// for use in controllers. Typical use in route:
// Vilio.PortfolioEditRoute = Ember.Route.extend({
//	// create transaction and add model to it
//	setupController: function(controller, model) {
//      this._super(controller, model);
//		this.store.transaction().add(model);
//	},
//	events: {
//		cancel: function() {
//			this.controller.stopEditing();
//          ...
//		},
//		save: function() {
//			var route = this;
//			this.controller.saveEdits().then(function() {
//				console.log('saved');
//				route.transitionTo...
//			}, function() {
//              console.log('error saving');
//          });
//		},
//		remove : function(portfolio) {
//			var route = this;
//			this.controller.deleteRecord().then(function(){
//				console.log('deleted');
//				route.transitionTo...
//			}, function() {
//              console.log('error deleting');
//          });
//		}
//	}
//});
Vilio.EditModelControllerMixin = Ember.Mixin.create({
    needs:['message'],

    // works for both save and edit by inspecting record states
    // commit record if it has changed; returns promise of 
    // record create or update
    saveEdits: function() {
      var controller = this,
          msgController = this.get('controllers.message'),
          record = this.get('content');
      return new Em.RSVP.Promise(function(resolve, reject) {
        // reset transaction if user wants to resubmit record
        // that is invalid or in error state
        if (!record.get('isValid') || record.get('isError')) {
          this.resetRecordState();
        }
        if (record.get('isDirty')) {
          msgController.set('message', 'saving record');
	  var method = record.get('isNew') === true ? 'didCreate' : 'didUpdate';
          // callback will show record once the id is available
          record.one(method, controller, function() {
            msgController.set('message', 'record saved');
            if (method === 'didUpdate') {
              // resolve promise
              resolve(record);
            } else {
              // observe for when id is created since we may need this
              // for transition
	      record.addObserver('id', this, resolve);
            }
          });
          var errorHandler = function() {
            var type = this.get('content.isError') ? 'error' : 'problem';
            msgController.set('message', type + ' saving record');
            this.get('content.transaction').rollback();
            // reject promise
            reject(record);
          };
          // callback for invalid or conflict response from server
          record.one('becameInvalid', controller, errorHandler);
          record.one('becameError', controller, errorHandler);
          // trigger save
	  record.get('transaction').commit(); 
        } else {
          msgController.set('message', 'no changes to save in model');
          resolve(record);
        }
     });
  },
  // returns promise to delete resource
  deleteRecord: function() {
    var controller = this,
        msgController = this.get('controllers.message'),
        record = this.get('content');
    return new Em.RSVP.Promise(function(resolve, reject) {
       msgController.set('message', 'deleting record');
       record.one('didDelete', controller, function() {
         msgController.set('message', 'record deleted');
         resolve();
       });
       record.one('didError', controller, function() {
         msgController.set('message', 'error deleting record');
         reject(record);
       });
       record.deleteRecord();
       controller.get('content.transaction').commit(); 
    });
  },
  stopEditing: function(callback) {
    var controller = this;
    return new Em.RSVP.Promise(function(resolve, reject) {
      controller.get('content.transaction').rollback();
      resolve();
    });
  },
  // enable transaction to be submitted again
  resetRecordState: function() {
    var record = this.get('content');
    var state = record.get('id') ? 'loaded.updated.uncommitted' : 'loaded.created.uncommited';
    record.get('stateManager').transitionTo(state);
  }
});