assets/js/vendor/backbone-relational.js
function( options ) {
			var related = null;

			options = _.defaults( { parse: this.options.parse }, options );

			if ( this.keyContents instanceof this.relatedModel ) {
				related = this.keyContents;
			}
			else if ( this.keyContents || this.keyContents === 0 ) { // since 0 can be a valid `id` as well
				var opts = _.defaults( { create: this.options.createModels }, options );
				related = this.relatedModel.findOrCreate( this.keyContents, opts );
			}

			// Nullify `keyId` if we have a related model; in case it was already part of the relation
			if ( this.related ) {
				this.keyId = null;
			}

			return related;
		}
function( options ) {
			var related = null;

			options = _.defaults( { parse: this.options.parse }, options );

			if ( this.keyContents instanceof this.relatedModel ) {
				related = this.keyContents;
			}
			else if ( this.keyContents || this.keyContents === 0 ) { // since 0 can be a valid `id` as well
				var opts = _.defaults( { create: this.options.createModels }, options );
				related = this.relatedModel.findOrCreate( this.keyContents, opts );
			}

			// Nullify `keyId` if we have a related model; in case it was already part of the relation
			if ( this.related ) {
				this.keyId = null;
			}

			return related;
		}
Find related Models.
@param {Object} [options]
@return {Backbone.Model}