Question

我似乎在从相关模型中检索属性时遇到了问题。

型号：

public sealed partial class MainPage : Page
{
    private ObservableCollection<string> myList = new ObservableCollection<string> { "1", "2", "3", "4", "5" };
    private int i = 6;

    public MainPage()
    {
        this.InitializeComponent();
        MyGridView.ItemsSource = myList;
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        myList.Add(i.ToString());
        i += 1;
    }
}

管理员注册路线：

// DB = export of Bookshelf

// Signup model
var DB = require('../db').DB;
var UserMeta = require('./usersmeta');

var Signup = DB.Model.extend({
  tableName: 'tblSignups',
  idAttribute: 'id',
  hasTimestamps: true,
  usermeta: function() {
    return this.belongsTo(UserMeta);
  }
});

module.exports = Signup;

// Usermeta model
var DB = require('../db').DB;
var User = require('./users');

var UserMeta = DB.Model.extend({
  tableName: 'tblUsersMeta',
  idAttribute: 'id',
  hasTimestamps: true,
  user: function() {
    return this.belongsTo(User);
  }
});

module.exports = UserMeta;

这是控制台日志显示的内容：

router.get('/signups', function(req, res, next) {
  model.SignUp.fetchAll({withRelated: ['usermeta']}).then(function(collection) {
    for(var i = 0; i < collection.toArray().length; i++){
      console.log('Signup ' + i + '\n--------------------------');
      console.log(collection.toArray()[i]);
      console.log('Related usermeta\n--------------------------');
      console.log(collection.toArray()[i].related('usermeta'));
    }
    res.render('admin/pages/signups', {title: 'signups', error: false, signups: collection.toArray()});
  }).catch(function(err) {
    res.status(500).json({error: true, data: {message: err.message}});
  });
});

因此，您可以看到相关的模型属性为空。我保存了我的usermeta，如下所示：

Signup 0
--------------------------
ModelBase {
  attributes:
   { id: 2,
     usermeta_id: 5,
     state: 'pending',
     created_at: Thu May 05 2016 17:21:13 GMT+0200 (Romance Daylight Time),
     updated_at: Thu May 05 2016 17:21:13 GMT+0200 (Romance Daylight Time) },
  _previousAttributes:
   { id: 2,
     usermeta_id: 5,
     state: 'pending',
     created_at: Thu May 05 2016 17:21:13 GMT+0200 (Romance Daylight Time),
     updated_at: Thu May 05 2016 17:21:13 GMT+0200 (Romance Daylight Time) },
  changed: {},
  relations:
   { usermeta:
      ModelBase {
        attributes: {},
        _previousAttributes: {},
        changed: {},
        relations: {},
        cid: 'c38',
        relatedData: [Object] } },
  cid: 'c35',
  id: 2 }
Related usermeta
--------------------------
ModelBase {
  attributes: {},
  _previousAttributes: {},
  changed: {},
  relations: {},
  cid: 'c38',
  relatedData:
   RelationBase {
     targetTableName: 'tblUsersMeta',
     targetIdAttribute: 'id',
     type: 'belongsTo',
     target:
      { [Function]
        NotFoundError: [Function: ErrorCtor],
        NoRowsUpdatedError: [Function: ErrorCtor],
        NoRowsDeletedError: [Function: ErrorCtor] },
     foreignKey: 'tblUsersMetum_id',
     parentId: undefined,
     parentTableName: 'tblSignups',
     parentIdAttribute: 'id',
     parentFk: undefined } }

在数据库中，usermeta的id（在注册表中）设置正确。我在这里做错了什么？

Answer 1

您的模型似乎有问题。当您在两个示例中使用belongsTo建立模型之间的关系时 - 这可能是正确的。我不知道它们之间的关系是什么（多对多？一对多？）。如果是多对多，则需要使用belongsToMany，如果是一对多，则需要在不支持外国人的模型上设置hasMany键入数据库，belongsTo键入数据库中具有外键的模型。

请参阅此http://bookshelfjs.org/#one-to-many和此http://bookshelfjs.org/#many-to-many

希望这有帮助！

Bookshelf获取相关数据属性为空

1 个答案: