骨干关系事件没有解雇？

Question

class TheModel extends Backbone.RelationalModel
    relations:[
        type: Backbone.HasMany
        key: 'subModels'
        relatedModel: SubModel
        collectionType: SubModels
        reverseRelation:
            key: 'TheModel'
    ]

themodel = new the TheModel({subModels:[{#stuff},{#stuff},{#stuff}]})

我有createModels,所以themodel.get('subModels')返回一组模型.

---

现在,如果我将更改的subModel数据传递给 mymodel

themodel.set({subModels:[{changedstuff},{stuff},{stuff}]})

不应该themodel抛出一个change事件？它不适合我.

---

如果我将相同的数据传入,则更是如此 mymodel

themodel.set({subModels:[{samestuff},{samestuff},{samestuff}]})

themodel.attributes.subModels投掷add和update事件,即使没有什么是新的.

我不确定为什么会出现这些问题,任何帮助都会很棒,谢谢!!!!

Answer 1

如果您通过设置新集合来重置整个关系，Backbone-relational 将（目前）仅替换整个集合，而不是检查差异。因此，它将remove为所有当前事件触发一个事件subModels，然后add为每个新事件触发事件。

不过，我确实使用change以下代码获取了事件（如果发布的代码包含完整的示例，则会有所帮助；）

var SubModel = Backbone.RelationalModel.extend({});

var TheModel = Backbone.RelationalModel.extend({
    relations: [{
        type: Backbone.HasMany,
        key: 'subModels',
        relatedModel: SubModel,
        reverseRelation: {
            key: 'TheModel'
        }
    }]
});

themodel = new TheModel({subModels: [{ id: 5 },{id: 7},{id: 8}]})

themodel.bind( 'change', function() {
        console.debug( 'change; args=%o', arguments );
    });
themodel.bind( 'change:subModels', function() {
        console.debug( 'change:subModels; args=%o', arguments );
    });
themodel.bind( 'update:subModels', function() {
        console.debug( 'update:subModels; args=%o', arguments );
    });
themodel.bind( 'add:subModels', function() {
        console.debug( 'add:subModels; args=%o', arguments );
    });
themodel.bind( 'remove:subModels', function() {
        console.debug( 'remove:subModels; args=%o', arguments );
    }); 


console.debug( 'set new subModels' );
themodel.set( {subModels: [{ id: 5 },{id: 7},{id: 9}] } )

这会产生以下输出：

set new subModels
change:subModels; args=[Object { _queue={...}, attributes={...}, _escapedAttributes={...}, more...}, [Object { id=5}, Object { id=7}, Object { id=9}], Object {}]
change; args=[Object { _queue={...}, attributes={...}, _escapedAttributes={...}, more...}, undefined]
remove:subModels; args=[Object { _queue={...}, attributes={...}, _escapedAttributes={...}, more...}, Object { length=3, models=[3], _byId={...}, more...}, Object { _related={...}}]
remove:subModels; args=[Object { _queue={...}, attributes={...}, _escapedAttributes={...}, more...}, Object { length=3, models=[3], _byId={...}, more...}, Object { _related={...}}]
remove:subModels; args=[Object { _queue={...}, attributes={...}, _escapedAttributes={...}, more...}, Object { length=3, models=[3], _byId={...}, more...}, Object { _related={...}}]
add:subModels; args=[Object { _queue={...}, attributes={...}, _escapedAttributes={...}, more...}, Object { length=3, models=[3], _byId={...}, more...}, Object {}]
add:subModels; args=[Object { _queue={...}, attributes={...}, _escapedAttributes={...}, more...}, Object { length=3, models=[3], _byId={...}, more...}, Object {}]
add:subModels; args=[Object { _queue={...}, attributes={...}, _escapedAttributes={...}, more...}, Object { length=3, models=[3], _byId={...}, more...}, Object {}]
update:subModels; args=[Object { _queue={...}, attributes={...}, _escapedAttributes={...}, more...}, Object { length=3, models=[3], _byId={...}, more...}, Object {}]

如果您没有看到这些更改事件，您可以检查一下您正在使用哪个版本的主干和主干关系吗？