嵌套包含在sequelize中？

Question

如何进行嵌套包含？我有 table 个产品与评论有一对多关系，table 个评论与用户 table 有多对一关系。所以评论有user_id，和product_id。我的代码是这样的

var models = require('../models');

models.products.findAll({
    include: [
        {model: models.comments}
    ]
  }).then(function (products) {
    next(products);
  }).catch(function (err) {
    next(err);
  });
});

我收到了评论，但我想要一些类似的东西

models.products.findAll({
    include: [
        {model: models.comments.include(models.comments.users)}
    ]
  })

这是否可以不编写自定义查询？

Answer 1

models.products.findAll({
  include: [
    {model: models.comments, include: [models.comments.users] }
  ]
})

Answer 2

您可以使用 include.

例如：

Category = sequelize.define(...);
Product = sequelize.define(...);
Product.belongsTo(Category, {foreignKey: 'fk_category'});

Product.findAll({
    include: [{
        model: Category
    }]
});

将在 category 属性.

中检索嵌套类别，而不仅仅是 ID

Answer 3

提供的解决方案对我不起作用，这是我使用的打字稿版本并猜测续集版本：

// sequelize-typescript
models.products.findAll({
  where,
  include: [{
    model: Comment,
    include: [User]
  }]
});

// without typescript (guessing here)
models.products.findAll({
  where,
  include: [{
    model: models.comments,
    include: [{
      model: models.users
    }]
  }]
});

Answer 4

有个方法很简洁明了！ https://sequelize.org/docs/v6/advanced-association-concepts/eager-loading/#including-everything

// Fetch all models associated with User
User.findAll({ include: { all: true }});

// Fetch all models associated with User and their nested associations (recursively) 
User.findAll({ include: { all: true, nested: true }});

Answer 5

如果这对以后的人有帮助：

我嵌套了多个层次，并且不断收到 Typescript 错误，我的调用与任何覆盖都不匹配。

对我来说，在之前的答案（或文档）中并不清楚您必须将 include 对象包装在所有级别的数组中（甚至在你只提供 1 个对象）。

作品：

User.findAll({
  include: [{
    model: Contact,
    include: [{
      model: Address,
      include: [{
        model: City,
        include: [State, Country]
      }]
    }]
  }]
});

不工作：

User.findAll({
  include: { // <-- notice the missing square bracket
    model: Contact,
    include: { // <-- notice the missing square bracket
      model: Address,
      include: { // <-- notice the missing square bracket
        model: City,
        include: [State, Country]
      } // <-- notice the missing square bracket
    } // <-- notice the missing square bracket
  } // <-- notice the missing square bracket
});

嵌套包含在sequelize中？

Nested include in sequelize?

javascript

mysql

sequelize.js

jointable