model-change

A plugin that adds change events to models.

Installation

$ component install component/model-change

Example

var model = require('model');
var change = require('model-change');

/**
 * User model.
 */

var User = model()
  .use(change())
  .attr('id')
  .attr('name');

/**
 * Listen.
 */

var user = new User({ name: 'Fred' });

user.on('change name', function (attr, val, prev) {
  console.log('name changed from "' + prev + '" to "' + val + '"'); 
});

user.name('George');

API

change([options])

Return the plugin with optional options:

separator: ' '

Once applied, these events are emitted on the constructor:

Model.emit('change', instance, attr, val, prev);
Model.emit('change<separator><attr>', instance, val, prev)

And these events are emitted on the instance:

model.emit('change', attr, val, prev);
model.emit('change<separator><attr>', val, prev);

#changed([attr])

Check whether an attr has changed since the last save.

When no attr is passed, the method either returns a dictionary of all the attributes that have changed, or false if none have changed.