使用objectionjs和koa插入具有模型关系的两个表

Question

我试图弄清楚为什么使用objectionjs orm的koa2后端帖子无法正常运行。设置为使用LoacController的create fucntion的/ loads帖子可以成功地在loads表中创建一个条目，但不会在stops表中创建一个条目，尽管该load模型具有到stop模型的关系映射。 ctx的控制台日志显示：

request: 
0|application | { customer_id: '1',
0|application |   stops: 
0|application |    [ { type: 'load', location: '2', time: '2018-07-13T11:43' },
0|application |      { type: 'drop', location: '1', time: '2018-07-13T11:43' } ] }

我肯定错过了一些东西...

*****************
/*
* model/Load.js
*/
*****************

const Model = require('../../config/model');

const Stop = require('./Stop');

class Load extends Model {
static get tableName() {
    return 'loads';
}

static get relationMappings() {
    return {
        stops: {
                    relation: Model.HasManyRelation,
                    modelClass: Stop,
                    join: {
                        from: 'stops.load_id',
                        to:   'loads.id'
                    }
            },
        };
    }
}


*****************
/*
* Models/Stop.js
*/
*****************

const Model = require('../../config/model');

const Location = require('./Location');

class Stop extends Model {
    static get tableName() {
        return 'stops';
    }

    static get hidden() {
        return [
            'load_id',
            'location_id'
        ];
    }

    $formatJson(json) {
        json = super.$formatJson(json);
        Stop.hidden.forEach(field => delete json[field]);
        return json;
    }

    static get relationMappings() {
        return {
            location: {
                relation: Model.BelongsToOneRelation,
                modelClass: Location,
                join: {
                    from: 'stops.location_id',
                    to:   'locations.id'
                }
            }
        }
    }
}

module.exports = Stop;

*****************
/*
* Models/Location.js
/*
*****************
const Model = require('../../config/model');

class Location extends Model {
    static get tableName() {
        return 'locations';
    }
}

module.exports = Location;

*****************
/*
* Controllers/LoadController.js
*/
*****************

const Load = require('../Models/Load.js');
const Stop = require('../Models/Stop.js');
const ApiProblem = require('../Helpers/ApiProblem.js');
const DatabaseError = require('../Helpers/DatabaseError.js');
const ValidateRequest = require('../Helpers/ValidateRequest.js');


class LoadController {

    async create(ctx) {
        const req = ValidateRequest(ctx, {
            'customer_id':      'string|required',
            'stops': 'array'
        });
        console.log('request: ');
        console.log(req);

        return Load.query().insert(req)
            .then(res => {
                return ctx.status = 201;
            })
            .catch(err => {
                return DatabaseError(err, ctx);
            });
    }
}

module.exports = LoadController;