Javascript bookshelfjsfetchwithrelated选项返回空的关系对象_Javascript_Node.js_Eager Loading_Bookshelf.js_Knex.js

Javascript bookshelfjsfetchwithrelated选项返回空的关系对象

javascript node.js

Javascript bookshelfjsfetchwithrelated选项返回空的关系对象,javascript,node.js,eager-loading,bookshelf.js,knex.js,Javascript,Node.js,Eager Loading,Bookshelf.js,Knex.js,我有一个图像模型和一个位置模型。图像模型包含指向位置的外键。要获取结果，我使用： fetch({withRelated: ['location']}; 我得到了以下结果： { "id": 24, "created_by": 1, "location_id": 202, "location": {} } 但我想要的是： { "id": 24, "created_by": 1, "lo

我有一个图像模型和一个位置模型。图像模型包含指向位置的外键。要获取结果，我使用：

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

我得到了以下结果：

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

但我想要的是：

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

我的图像模型：

objectProperties = {
    tableName: 'images',
    location: function () {
        return this.hasOne(location, 'id');
    }
};

classProperties = {};

imageModel = bookshelf.Model.extend(objectProperties, classProperties);

我的位置模型：

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

classProperties = {};

locationModel = bookshelf.Model.extend(objectProperties, classProperties);

为什么接收到空的location对象？

您在模型中的关系是错误的。您将belongtomany（仅用于m:n关系）与hasOne结合使用（不能与belongtomany一起使用）。您的问题不清楚这两张表之间有什么关系，因此我无法进一步帮助您。但问题不在于相关，而在于模型定义。希望这有帮助。

看看下面的例子

人员：身份证人员，姓名，身份证国家与相关国家：身份证国家，姓名，身份证省份与相关省份：身份证省份，姓名

确定生成个人、国家和省的模型

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);

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

'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
        });
    });
}

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);

使用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;

'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
        });
    });
}

使用controller person.js

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

'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"
                 }
           }
    },{...}]
}