问题描述

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') 返回模型的集合.

I have createModels on so themodel.get('subModels') returns a collection of models.

现在，如果我将更改的子模型数据传递到 mymodel

Now if I pass changed subModel data into mymodel

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

themodel 不应该抛出 change 事件吗?它不适合我.

Shouldn't themodel throw a change event? It doesn't for me.

如果我将相同的数据传递给 mymodel

More so if I pass identical data into mymodel

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

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

themodel.attributes.subModels throws add and update events, even though nothing is new.

我不确定为什么会出现这些问题，任何帮助都会很棒，谢谢！！！！

I'm not sure why these issues are happening, any help would be great, thanks!!!!

推荐答案

如果你通过设置一个新集合来重置整个关系，Backbone-relational 将(目前)只是替换整个集合，而不是检查差异.所以它会为所有当前的 subModels 触发 remove 事件，然后为每个新的 add 事件触发.

If you reset a whole relation like that by setting a new collection, Backbone-relational will (at the moment) just replace the whole collection, instead of checking for differences. So it'll fire a remove event for all current subModels, then fire add events for each new one.

我确实收到了 change 事件，使用以下代码(如果发布的代码包含完整的示例，这将有所帮助；)

I do get change events though, with the following code (it would help if posted code contains a complete example though ;)

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，您能否检查一下您正在使用哪些版本的主干和主干关系?

If you don't see these change events, could you check which versions of backbone and backbone-relational you're using?

这篇关于骨干关系事件未触发?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！