Node Sequelize 中预加载嵌套模型的排序结果

Question

我有一组复杂的关联模型。这些模型使用连接表关联，每个表都有一个名为 'order' 的属性。我需要能够查询父模型 'Page' 并包含关联模型，并按字段 'order'.

对这些关联进行排序

以下内容对结果的排序顺序没有影响：

db.Page.findAll({
  include: [{
    model: db.Gallery,
    order: ['order', 'DESC'],
    include: [{
      model: db.Artwork,
      order: ['order', 'DESC']
    }]
  }],
})

Answer 1

我相信你能做到：

db.Page.findAll({
  include: [{
    model: db.Gallery
    include: [{
      model: db.Artwork
    }]
  }],
  order: [
    // sort by the 'order' column in Gallery model, in descending order.

    [ db.Gallery, 'order', 'DESC' ], 


    // then sort by the 'order' column in the nested Artwork model in a descending order.
    // you need to specify the nested model's parent first.
    // in this case, the parent model is Gallery, and the nested model is Artwork

    [ db.Gallery, db.ArtWork, 'order', 'DESC' ]
  ]
})

还有很多不同的方式，或者您可以在订购时做的事情。在这里阅读更多：https://sequelize.org/master/manual/model-querying-basics.html#ordering-and-grouping

Answer 2

如果您还使用 'as' 并且假设您想按 'createdDate' 订购，则查询如下所示：

DbCategoryModel.findAll({
    include: [
        {
            model: DBSubcategory,
            as: 'subcategory',
            include: [
                {
                    model: DBProduct,
                    as: 'product',
                }
            ],
        }
    ],
    order: [
        [
            {model: DBSubcategory, as: 'subcategory'},
            {model: DBProduct, as: 'product'},
            'createdDate',
            'DESC'
        ]
    ]
})

Answer 3

order: [
[ db.Sequelize.col('order'), 'DESC'],    /*If you want to order by page module as well you can add this line*/
[ db.Gallery, db.ArtWork, 'order', 'DESC' ]
]

Answer 4

这对我有用：

let getdata = await categories_recipes.findAll({   
                    order:[ 
                        [{model: recipes, as: 'recipesdetails'},'id', 'DESC'] // change your column name like (id and created_at)
                    ],
                    include:[{
                        model:recipes, as : "recipesdetails",
                        include:[{
                            model:recipe_images, as: "recipesimages",
                        }],
                        where:{
                            user_id:data.id
                        },
                        required: true,
                    }]
                })

Node Sequelize 中预加载嵌套模型的排序结果

Ordering results of eager-loaded nested models in Node Sequelize

postgresql

node.js

sequelize.js