Bookshelf js fetch withRelated选项返回空关系对象

Bookshelf js fetch withRelated option returns empty relation object

本文关键字：关系 对象 返回 选项 js fetch withRelated Bookshelf      更新时间：2023-09-26

我有一个图像模型和一个位置模型。图像模型包含location的外键。为了获取结果，我使用:

fetch({withRelated: ['location']};

和I收到以下结果:

{
        "id": 24,
        "created_by": 1,
        "location_id": 202,
        "location": {}
}

但是我想要这样的:

{
        "id": 24,
        "created_by": 1,
        "location": {....}
}

My image model:

objectProperties = {
    tableName: 'images',
    location: function () {
        return this.hasOne(location, 'id');
    }
};
classProperties = {};
imageModel = bookshelf.Model.extend(objectProperties, classProperties);

和我的位置模型:

objectProperties = {
    tableName: 'locations',
    images: function () {
        return this.belongsToMany(image, 'location_id');
    }
};
classProperties = {};
locationModel = bookshelf.Model.extend(objectProperties, classProperties);

为什么我收到一个空位置对象?

看下面的例子

person: id_person, name, id_country withRelated country: id_country, name, id_province withRelated province: id_province, name

OK生成模型人物、国家和省

person.js 

'use strict'
const Bookshelf = require('../commons/bookshelf');
const Country   = require('./country');
let Person = Bookshelf.Model.extend({
    tableName: 'person',
    idAttribute: 'id_person',
    country: function() {
        return this.belongsTo(Country, 'id_country');
    }
});
module.exports = Bookshelf.model('Person', Person);

country.js 

'use strict'
const Bookshelf = require('../commons/bookshelf');
const Province  = require('./province');
let Country = Bookshelf.Model.extend({
    tableName: 'country',
    idAttribute: 'id_country',
    province: function() {
        return this.belongsTo(Province, 'id_province');
    }
});
module.exports = Bookshelf.model('Country', Country);

province.js 

'use strict'
const Bookshelf = require('../commons/bookshelf');
let Province = Bookshelf.Model.extend({
    tableName: 'province',
    idAttribute: 'id_province'
});
module.exports = Bookshelf.model('Province', Province);

with collections person.js

'use strict'
const Bookshelf = require('../commons/bookshelf');
const Person = require('../models/person');
const Persons = Bookshelf.Collection.extend({
    model: Person
});
module.exports = Persons;

with controller person.js

'use strict';
const Persons   = require('../collections/persons');
const Person    = require('../models/person');
function getPersons(req, res, next) {
    Motivos.query({})
    .fetch({
        withRelated: [
             'country',
             'country.province'
        ] })
    .then(function(data) {
        return res.status(200).json({
            error: false,
            data: data
        });
    });
}

json是

{
    "error":false,
    "data":[{
          "id_person": 1,
          "name": "leonardo",
          "id_country": 3,
          "country":{
                 "id_country": 3,
                 "name":"venezuela",
                 "id_province": 2,
                 "province":{
                        "id_province": 2,
                        "name":"lara"
                 }
           }
    },{...}]
}

你在模型中的关系是错误的。您可以将belongsToMany(仅用于m:n关系)与hasOne(不能与belongsToMany一起使用)结合使用。从你的问题中我不清楚这两个表之间有什么样的关系，所以我无法进一步帮助你。但问题不在于withRelated，而在于模型定义。

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