Question

使用以下功能，操作无法正确构建标准。

   getArticlesByUser:function(cb,val)
    {
        Article.find({state:'Normal'}).populate('user', {id: cb.iduser }).populate('images').populate('devise').exec(function(err,article){

            if(article)
            {
                    val(null,article);
            }
            if(err)
            {
                val(err,null);
            }
        })
    }

似乎忽略了user模型的标准。我该如何解决？

Answer 1

populate方法有两个参数：

外键：属性名称
查询（可选）：限制填充值列表

如示例in the docs中所示，第二个参数不是必需的，仅在您具有一对多关联时才有用。

例如，如果你有这些模型：

createdAt:
    type: datetime
    gedmo:
        timestampable:
            on: create
    column: created_at
updatedAt:
    type: datetime
    gedmo:
        timestampable:
            on: update
    column: updated_at

以下是使用// Article.js module.exports = { attributes: { author: { model: 'user' }, title: { type: 'string' } } }; // User.js module.exports = { attributes: { articles: { collection: 'article', via: 'author' }, name: { type: 'string' } } };的一些方法：

populate

在您的情况下，您想要获取用户的文章。这是如何做到的：

// Get a user from his name
User.findOne({ name: 'Pisix' }).function(err, result) {
  console.log(result.toJSON());
});

/* 
{ name: 'Pisix',
  createdAt: Wed Jun 20 2015 14:07:25 GMT-0600 (CST),
  updatedAt: Wed Jun 20 2015 14:07:25 GMT-0600 (CST),
  id: 7 }
*/

// Get a user from his name + his articles
User.findOne({ name: 'Pisix' }).populate('articles').function(err, result) {
  console.log(result.toJSON());
});

/* 
{ articles:
    [ { title: 'The first article',
        id: 1,
        createdAt: Wed Jun 20 2015 14:12:33 GMT-0600 (CST)
        updatedAt: Wed Jun 20 2015 14:12:33 GMT-0600 (CST) },
      { title: 'Another article',
        id: 2,
        createdAt: Wed Jun 21 2015 15:04:12 GMT-0600 (CST)
        updatedAt: Wed Jun 21 2015 15:04:12 GMT-0600 (CST) },
      { title: 'I\'m back',
        id: 10,
        createdAt: Wed Jun 30 2015 13:25:45 GMT-0600 (CST)
        updatedAt: Wed Jun 30 2015 13:25:45 GMT-0600 (CST) } ],
  name: 'Pisix',
  createdAt: Wed Jun 20 2015 14:07:25 GMT-0600 (CST),
  updatedAt: Wed Jun 20 2015 14:07:25 GMT-0600 (CST),
  id: 7 }
*/

// Get a user from his name + one of his articles from its title
User.findOne({ name: 'Pisix' }).populate('articles' , { title: 'The first article' }).function(err, result) {
  console.log(result.toJSON());
});

/* 
{ articles:
    [ { title: 'The first article',
        id: 1,
        createdAt: Wed Jun 20 2015 14:12:33 GMT-0600 (CST)
        updatedAt: Wed Jun 20 2015 14:12:33 GMT-0600 (CST) } ],
  name: 'Pisix',
  createdAt: Wed Jun 20 2015 14:07:25 GMT-0600 (CST),
  updatedAt: Wed Jun 20 2015 14:07:25 GMT-0600 (CST),
  id: 7 }
*/

填充标准失败

1 个答案: