pairs

defaultsmodel.defaults or model.defaults() The defaults hash (or function) can be used to specify the default attributes for

hasmodel.has(attribute) Returns true if the attribute is set to a non-null or non-undefined value.

changedmodel.changed The changed property is the internal hash containing all the attributes that have changed since its last

urlmodel.url() Returns the relative URL where the model's resource would be located on the server. If your models are located somewhere

hasChangedmodel.hasChanged([attribute]) Has the model changed since its last

changedAttributesmodel.changedAttributes([attributes]) Retrieve a hash of only the model's attributes that have changed since the

validationErrormodel.validationError The value returned by validate

escapemodel.escape(attribute) Similar to get, but returns

clearmodel.clear([options]) Removes all attributes from the model, including the id attribute. Fires a "change"