如何在Bookshelf中获取join模型的模型？

我有这个股票和快照的这个1对多的数据模型。

// stock.js var bookshelf = require('../config'); var Snapshot = require('./snapshot'); var Stock = bookshelf.Model.extend({ tableName: 'stocks', hasTimestamps: true, snapshots: function() { return this.hasMany(Snapshot); } }); module.exports = bookshelf.model('Stock', Stock); 

每只股票都有许多数据快照。 快照属于一个股票：

 var bookshelf = require('../config'); var Stock = require('./stock'); var Snapshot = bookshelf.Model.extend({ tableName: 'snapshots', hasTimestamps: true, stock: function() { return this.belongsTo(Stock); } }); module.exports = bookshelf.model('Snapshot', Snapshot); 

但是，当我试图从一个股票中获取多个快照像这样：

 // report stock var bookshelf = require('./config'); var Stock = require('./models/stock'); var Snapshot = require('./models/snapshot'); var Promise = require("bluebird"); Stock.fetchAll({ withRelated: ['snapshots'], debug: true }) .then(function(collection) { return collection.mapThen(function(model) { return model.toJSON(); }) }) .then(function(results) { console.log(results); }) .finally(function(r) { return bookshelf.knex.destroy(); }) .catch(function(e) { console.log(e); }); 

我没有看到任何快照：

 { method: 'select', options: {}, bindings: [], sql: 'select "stocks".* from "stocks"' } { method: 'select', options: {}, bindings: [ 1 ], sql: 'select "snapshots".* from "snapshots" where "snapshots"."stock_id" in (?)' } [ { id: 1, name: '...', symbol: '...', created_at: 1460285493918, updated_at: 1460285493918, snapshots: [] } ] 

我期望看到快照和join查询。 但是，快照数组是空的。 我错过了什么？

谢谢！

Answer 1

如果您正在使用bookshelf.plugin("registry") ，则需要通过string名称链接您的关系 。

 var bookshelf = require('../config') var Stock = bookshelf.model('Stock', { tableName: 'stocks', hasTimestamps: true, snapshots: function () { return this.hasMany('Snapshot') } }) var Snapshot = bookshelf.model('Snapshot', { tableName: 'snapshots', hasTimestamps: true, stock: function () { return this.belongsTo('Stock') } })