Backbone.js 主干关系属于

如何使用主干和主干关系创建和使用归属（或多对一）关系？

如果您的关系是，例如，一栋建筑有多个房间。房间属于建筑物：

Building = Backbone.RelationalModel.extend({
    relations: [
        {
            type: 'HasMany',
            key: 'rooms',
            relatedModel: 'Room',
            reverseRelation: {
                key: 'building'
            }
        }
    ]
});

Room = Backbone.RelationalModel.extend();

house = new Building({id:1});
science_building = new Building({id:2});

console.log(house.get('rooms').length);  // ==> 0

living_room = new Room({building:1,name:"Living Room"});
lab = new Room({building:2,name:"Chemistry Lab"});

console.log(house.get('rooms').length); // ==> 1
console.log(house.get('rooms').first().get('name')); // ==> "Living Room"

console.log(science_building.get('rooms').length); // ==> 1
console.log(science_building.get('rooms').first().get('name')); // ==> "Chemistry Lab"

---

reverseRelation属性指定关系的“属于”部分。

如果您的关系是，例如，一栋建筑有许多房间。房间属于建筑物：

Building = Backbone.RelationalModel.extend({
    relations: [
        {
            type: 'HasMany',
            key: 'rooms',
            relatedModel: 'Room',
            reverseRelation: {
                key: 'building'
            }
        }
    ]
});

Room = Backbone.RelationalModel.extend();

house = new Building({id:1});
science_building = new Building({id:2});

console.log(house.get('rooms').length);  // ==> 0

living_room = new Room({building:1,name:"Living Room"});
lab = new Room({building:2,name:"Chemistry Lab"});

console.log(house.get('rooms').length); // ==> 1
console.log(house.get('rooms').first().get('name')); // ==> "Living Room"

console.log(science_building.get('rooms').length); // ==> 1
console.log(science_building.get('rooms').first().get('name')); // ==> "Chemistry Lab"

---

reverseRelation属性指定关系的“属于”部分。

我想我也需要在房间模型中定义关系，但它会自动找到它。所以

lab.get（'building'）

将返回科学大楼。谢谢这个回答终于让我明白了。非常感谢。我想我也需要在房间模型中定义关系，但它会自动找到它。所以

lab.get（'building'）

将返回科学大楼。谢谢这个回答终于让我明白了。非常感谢。