assets/js/vendor/backbone-relational.js
function( options ) {
			// If this Model has already been fully serialized in this branch once, return to avoid loops
			if ( this.isLocked() ) {
				return this.id;
			}

			this.acquire();
			var json = Backbone.Model.prototype.toJSON.call( this, options );

			if ( this.constructor._superModel && !( this.constructor._subModelTypeAttribute in json ) ) {
				json[ this.constructor._subModelTypeAttribute ] = this.constructor._subModelTypeValue;
			}

			_.each( this._relations, function( rel ) {
				var related = json[ rel.key ],
					includeInJSON = rel.options.includeInJSON,
					value = null;

				if ( includeInJSON === true ) {
					if ( related && _.isFunction( related.toJSON ) ) {
						value = related.toJSON( options );
					}
				}
				else if ( _.isString( includeInJSON ) ) {
					if ( related instanceof Backbone.Collection ) {
						value = related.pluck( includeInJSON );
					}
					else if ( related instanceof Backbone.Model ) {
						value = related.get( includeInJSON );
					}

					// Add ids for 'unfound' models if includeInJSON is equal to (only) the relatedModel's `idAttribute`
					if ( includeInJSON === rel.relatedModel.prototype.idAttribute ) {
						if ( rel instanceof Backbone.HasMany ) {
							value = value.concat( rel.keyIds );
						}
						else if  ( rel instanceof Backbone.HasOne ) {
							value = value || rel.keyId;
						}
					}
				}
				else if ( _.isArray( includeInJSON ) ) {
					if ( related instanceof Backbone.Collection ) {
						value = [];
						related.each( function( model ) {
							var curJson = {};
							_.each( includeInJSON, function( key ) {
								curJson[ key ] = model.get( key );
							});
							value.push( curJson );
						});
					}
					else if ( related instanceof Backbone.Model ) {
						value = {};
						_.each( includeInJSON, function( key ) {
							value[ key ] = related.get( key );
						});
					}
				}
				else {
					delete json[ rel.key ];
				}

				if ( includeInJSON ) {
					json[ rel.keyDestination ] = value;
				}

				if ( rel.keyDestination !== rel.key ) {
					delete json[ rel.key ];
				}
			});

			this.release();
			return json;
		}
function( options ) {
			// If this Model has already been fully serialized in this branch once, return to avoid loops
			if ( this.isLocked() ) {
				return this.id;
			}

			this.acquire();
			var json = Backbone.Model.prototype.toJSON.call( this, options );

			if ( this.constructor._superModel && !( this.constructor._subModelTypeAttribute in json ) ) {
				json[ this.constructor._subModelTypeAttribute ] = this.constructor._subModelTypeValue;
			}

			_.each( this._relations, function( rel ) {
				var related = json[ rel.key ],
					includeInJSON = rel.options.includeInJSON,
					value = null;

				if ( includeInJSON === true ) {
					if ( related && _.isFunction( related.toJSON ) ) {
						value = related.toJSON( options );
					}
				}
				else if ( _.isString( includeInJSON ) ) {
					if ( related instanceof Backbone.Collection ) {
						value = related.pluck( includeInJSON );
					}
					else if ( related instanceof Backbone.Model ) {
						value = related.get( includeInJSON );
					}

					// Add ids for 'unfound' models if includeInJSON is equal to (only) the relatedModel's `idAttribute`
					if ( includeInJSON === rel.relatedModel.prototype.idAttribute ) {
						if ( rel instanceof Backbone.HasMany ) {
							value = value.concat( rel.keyIds );
						}
						else if  ( rel instanceof Backbone.HasOne ) {
							value = value || rel.keyId;
						}
					}
				}
				else if ( _.isArray( includeInJSON ) ) {
					if ( related instanceof Backbone.Collection ) {
						value = [];
						related.each( function( model ) {
							var curJson = {};
							_.each( includeInJSON, function( key ) {
								curJson[ key ] = model.get( key );
							});
							value.push( curJson );
						});
					}
					else if ( related instanceof Backbone.Model ) {
						value = {};
						_.each( includeInJSON, function( key ) {
							value[ key ] = related.get( key );
						});
					}
				}
				else {
					delete json[ rel.key ];
				}

				if ( includeInJSON ) {
					json[ rel.keyDestination ] = value;
				}

				if ( rel.keyDestination !== rel.key ) {
					delete json[ rel.key ];
				}
			});

			this.release();
			return json;
		}
Convert relations to JSON, omits them when required