javascript - Backbone 模型中的验证方法未被调用？

Question

开始学习 Backbone，尝试在我的 Person 模型中做一些简单的验证，但是当我设置新的年龄时，验证方法似乎没有运行。谁能解释我在这方面可能哪里出错了？在我做对之前不想继续我的学习。

JS

var Person = Backbone.Model.extend({

    defaults: {
        name: 'John Doe',
        age: 30,
        occupation: 'working'
    },

    validate: function(attrs) {

        console.log(attrs);

        if ( attrs.age < 0 ) {
            return 'Age must be positive, stupid';
        }

        if ( ! attrs.name ) {
            return 'Every person must have a name, you fool.';
        }

    },

    work: function() {
        return this.get('name') + ' is working.';
    }

});

目前我只是在控制台中获取和设置值，所以:

var person = new Person({
    name: 'Lady Madonna',
    age: 23
});

person.on('error', function(model, error){
    console.log(error);
});

当我将年龄设置为负值时，验证方法不生效:

person.set('age', -55);

Answer 1

模型验证 changed in Backbone 0.9.10 :

Model validation is now only enforced by default in Model#save and no longer enforced by default upon construction or in Model#set, unless the {validate:true} option is passed.

并注意

Model validation now fires invalid event instead of error.

所以你的代码应该写成

var person = new Person({
    name: 'Lady Madonna',
    age: 23
});

person.on('invalid', function(model, error){
    console.log(error);
});

person.set('age', -55, {validate : true});

还有一把 fiddle http://jsfiddle.net/nikoshr/aUxdS/