Question

我在many-to-many和Songs之间有一个People。未指定连接模型，因为它只有三列：主键song_id和person_id。

书架定义：

//Song
Bookshelf.model("Song", {
    tableName: "songs",
    people: function() { 
        return this.belongsToMany("Person", "people_songs");
    }
});

//Person
Bookshelf.model("Person", {
    tableName: "people",
    songs: function() { 
        return this.belongsToMany("Song", "people_songs");
    }
});

鉴于歌曲ID和人物ID，我想在连接表中添加一行。 Attach似乎是在模型实例上使用的正确方法，所以在控制器中我可以做...

Models
    .Song
    .forge()
    .where({id: 1})
    .people()
    .attach( new Models.Person({id: 1}) )
    .then(function(instance) {
        res.send();
    });

当我查询行时，song_id为空？（我应该列notNullable()列，但除此之外......

我也试过updatePivot这样：

Models
    .Song
    .forge()
    .where({id: 1})
    .people()
    .updatePivot({song_id: 1, person_id: 1})
    .then(function(instance) {
        res.send();
    });

但是，这甚至没有在连接表中插入任何东西。但是，如果我注销updatePivot承诺的结果，我会得到这个：

relatedData: {
    targetTableName: "songs",
    targetIdAttribute: "id",
    joinTableName: "people_songs",
    foreignKey: "song_id"
    otherKey: undefined,
    parentId: undefined,
    parentTableName: "people",
    parentIdAttribute: "id",
    parentFk: undefined
}

Answer 1

在repo issue中找到解决方案。

//get the model
Models
    .Song
    .forge({id: 12})
    //but I have no idea why save is being used here instead of fetch
    .save()
    .then(function(model) {
        //get the other model you want to add to the join table
        return Models
                .Person
                .forge({id: 56})
                .save()
                .then(function(target) {
                    //need to send both references down the promise chain
                    return {target: target, model: model};
                });

    })
    .then(function(references) {
        return references
                .model
                //get the belongsToMany relation specified in your Model definition, it returns a collection
                .people()
                //attach the target to the collection, not the model instance
                .attach(references.target);
    })
    .then(function(relation) {
        res.send();
    })

结果是

people_songs

id  |  person_id  | song_id
___________________________

3   |  56         |  12

将行插入连接表？

1 个答案: