extjs - Store.findBy() 表现得很疯狂？

Question

我已经调试了好几天了。 Store.findBy(function (record, id)不行为。或者也许是我行为不端。已将 JSON 放入代码中，以便于测试。 FindBy() 匹配 12345 而没有 12345，它返回索引为 0 和 foo。我在做什么？

Ext.application({
    name: 'MyApp',
    launch: function() {

        var theJson = {
            "users": [{
                "user": {
                    "id": 0 ,
                    "name": "foo" ,
                    "age": 22 ,
                    "skills": [{
                        "type": "bowcrafting" ,
                        "skillLevel": 50 ,
                        "levels": [10, 25, 50, 75, 90, 95, 99, 100]
                    }]
                }} , {
                "user": {
                    "id": 1 ,
                    "name": "bar" ,
                    "age": 71 ,
                    "skills": [{
                        "type": "fencing" ,
                        "skillLevel": 32 ,
                        "levels": [10, 25, 50, 90, 95, 99, 100]
                    } , {
                        "type": "swordsmanship" ,
                        "skillLevel": 73 ,
                        "levels": [10, 25, 50, 75, 80, 85, 90, 95, 99, 100]
                    }]
                }} , {
                "user": {
                    "id": 2 ,
                    "name": "foobar" ,
                    "age": 132 ,
                    "skills": [{
                        "type": "tactics" ,
                        "skillLevel": 90 ,
                        "levels": [10, 25, 50, 90, 95, 99, 100]
                    } , {
                        "type": "carpentery" ,
                        "skillLevel": 86 ,
                        "levels": [10, 25, 50, 75, 90, 95, 99, 100]
                    } , {
                        "type": "hiding" ,
                        "skillLevel": 100 ,
                        "levels": [10, 25, 50, 65, 75, 80, 85, 90, 95, 99, 100]
                    }]
                }
            }]
        };

        var jstore = Ext.create ('Ext.data.Store', {
            fields: ['id', 'name', 'age', 'skills'] ,
            data : theJson,
            proxy: {
                type: 'memory' ,
                reader: {
                    type: 'json' ,
                    root: 'users' ,
                    record: 'user' ,
                    idProperty: 'id'
                }
            } ,

            autoLoad: true
        });

        Ext.create ('Ext.button.Button', {
            text: 'Push me' ,
            renderTo: Ext.getBody () ,
            handler: function (btn) {
                var index = jstore.findBy (function (user, id) {
                    // Here's the hint
                    if (user.data.skills.skillLevel === 12345) return id;
                    else return -1;
                });

                console.log ('index = ', index);

                if (index != -1) {
                    // It will print 'foo' because it's the user
                    // that has the skillLevel equal to 50
                    console.log (jstore.getAt(index).get ('name'));
                };

                if (index === -1) {
                    // It will print 'foo' because it's the user
                    // that has the skillLevel equal to 50
                    console.log ('Failed');
                }
            }
        });
    }
}); 

Answer 1

你有吗read the documentation ?您的 findBy方法不符合契约(Contract)。特别是，它返回 -1如果不匹配，并且由于这是 JavaScript，则 -1是 true ，所以找到第一条记录。

        handler: function (btn) {
            var index = jstore.findBy (function (user, id) {
                // Here's the hint
                console.log(id);
                console.log(user);

                if (user.data.skills.skillLevel === 12345) return true;
                else return false;
            });

(这解决了你的误报问题，我并不是说你的支票会找到任何东西)。