Reopen the Model class, to allow cloning records with overrides.

ember-model-clone.js

import Ember from 'ember';
import DS from 'ember-data';

/**
 * Returns the model class name, dasherized, which can be used to find
 * and create new models of the same type through the store.
 */
export function getClassName(model) {
	// typeKey introduced in Ember Data 1.0.0.beta.3
	var typeKey = model.constructor.typeKey;
	return Ember.String.dasherize(typeKey);
}

export function initialize() {

	// Thanks http://stackoverflow.com/a/22514312
	DS.Model.reopen({

		clone: function(overrides) {
			var model = this, attrs = model.toJSON();
			var root = getClassName(model);

			/*
			 * Need to replace the belongsTo association ( id ) with the
			 * actual model instance.
			 *
			 * For example if belongsTo association is project, the
			 * json value for project will be:  ( project: "project_id_1" )
			 * and this needs to be converted to ( project: [projectInstance] )
			 */
			this.eachRelationship(function(key, relationship) {
				if (relationship.kind === 'belongsTo') {
					attrs[key] = model.get(key);
				}
			});

			/*
			 * Need to dissociate the new record from the old.
			 */
			delete attrs.id;

			/*
			 * Apply overrides if provided.
			 */
			if (Ember.typeOf(overrides) === 'object') {
				Ember.setProperties(attrs, overrides);
			}

			return this.store.createRecord(root, attrs);
		},

	});

};

export default {
  name: 'model-cloning',
  initialize: initialize
};