Question

我有四个模特Tehsil，Ilr，Patwar和Villages。和他们的关系是

Tehsil - ＆gt; 1：m - > Ilr - ＆gt; 1：m - > Patwar - ＆gt; 1：m - >村庄

我想在我的所有四个模型上应用订单。

查询：

var tehsilQuery = {
    include: [{
        model: Ilr,
        as: 'GirdawariKanoongo',
        include: [{
            model: Patwar,
            as: 'GirdawariPatwar',
            include: [{
                model: Villages,
                as: 'GirdawariVillages',
            }]
        }]
    }],
    order: [
        ['tehsil_name', 'ASC'],
        [ {model: Ilr, as: 'GirdawariKanoongo'}, 'kanoongo_name', 'ASC'],
        [ {model: Patwar, as: 'GirdawariPatwar'}, 'patwar_area', 'ASC'],
        [ {model: Villages, as: 'GirdawariVillages'}, 'village_name', 'ASC'],
    ]
};
return Tehsils.findAll(tehsilQuery);

[Error: 'girdawari_patwar' in order / group clause is not valid association]

如果我从Patwar删除Villages和order（lat两个模型），则按顺序工作。

Answer 1

另一个嵌套排序的工作示例：

order: [  
  [ { model: chapterModel, as: 'Chapters' }, 'createdAt', 'ASC'], 
  [ { model: chapterModel, as: 'Chapters' }, 
    { model: partModel, as: 'Parts' }, 'createdAt', 'ASC'] 
],

其中part和chapter具有M：1关系。

Answer 2

我解决了。这是order看起来的样子：

order: [
        'tehsil_name',
        'GirdawariKanoongo.kanoongo_name',
        'GirdawariKanoongo.GirdawariPatwar.patwar_area',
        'GirdawariKanoongo.GirdawariPatwar.GirdawariVillages.village_name' 
       ]

我所要做的就是：在表格的关联中使用as并将它们链接起来，然后column_name应该适用order。

Answer 3

我们的场景是使用两个嵌套的List<String> lines = Files.readAllLines(pathToFile);语句，其中最里面的嵌套没有正确排序。通过在include的最高级别应用ordering，我们能够成功返回有序对象。

我们的findAll的模型关系如下：

suveySet有很多调查
调查属于很多问题
```
surveySet.findAll
```

Answer 4

对于任何想知道如何使用对象样式定义来实现的人，这就是解决方法。您可以在Sequelize documentation中找到有关订购的更多信息。

order: [
    ['tehsil_name', 'ASC'],
    [ {model: Ilr, as: 'GirdawariKanoongo'}, 'kanoongo_name', 'ASC'],
    [ {model: Ilr, as: 'GirdawariKanoongo'}, {model: Patwar, as: 'GirdawariPatwar'}, 'patwar_area', 'ASC'],
    [ {model: Ilr, as: 'GirdawariKanoongo'}, {model: Patwar, as: 'GirdawariPatwar'}, {model: Villages, as: 'GirdawariVillages'}, 'village_name', 'ASC'],
]

在sequelize无法正常工作的嵌套eager loading中排序

4 个答案: