node.js - 如何在 Bookshelf 中获取已连接模型的模型？

Question

我有一个针对股票和快照的一对多数据模型。

// 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);

每只股票都有很多数据快照。快照属于股票:

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，当我尝试从 Stock 中获取多个快照时，如下所示:

// 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: [] } ]

我希望看到快照和join查询。但是，快照数组是空的。我错过了什么？

谢谢!

Answer 1

如果您使用bookshelf.plugin("registry")，则需要链接您的relations按字符串名称。

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')
  }
})