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node.js - Sequelize - 尝试使用“include”获取关联对象以获取 belongsToMany 关系

问题描述

我有一个名为 Experience 的模型，它通过 ExperienceCategory 表与模型 Category 有一个 belongsToMany 关联。对于体验，我正在尝试使用它所属的类别获取体验详细信息。我正在使用一些include: [{model: model.Category}]来实现这一点。现在，该关联正在工作并且它正在正确获取类别，但问题是它提供了体验模型的多个对象，每个类别一个。以下是我的代码的一些摘录：

model.Experience.findAll({
  include: [
    {
      model: model.Category
    }
  ]
}).then(experiences => {
  res.json({experiences: experiences});
})

这就是我定义我的关联的方式：
experience.js：

Experience.belongsToMany(models.Category, {
  through: 'ExperienceCategory',
  foreignKey: 'experience_id',
});

类别.js

Category.belongsToMany(models.Experience, {
  through: 'ExperienceCategory',
  foreignKey: 'category_id'
});

对上述查询的响应是：

{
  "experiences": [
    {
      "id": 23,
      "title": "Some title",
      "notes": "These are notes",
      "base_amount": 2000,
      "is_disabled": false,
      "is_deleted": false,
      "createdAt": "2019-05-27T12:24:06.736Z",
      "updatedAt": "2019-07-23T11:20:23.695Z",
      "Categories.id": 4,
      "Categories.name": "Trekking",
      "Categories.is_disabled": false,
      "Categories.is_deleted": false,
      "Categories.createdAt": "2019-05-14T11:07:40.287Z",
      "Categories.updatedAt": "2019-05-14T11:07:40.287Z",
      "Categories.ExperienceCategory.experience_id": 23,
      "Categories.ExperienceCategory.category_id": 4,
      "Categories.ExperienceCategory.createdAt": "2019-05-27T12:24:06.806Z",
      "Categories.ExperienceCategory.updatedAt": "2019-05-27T12:24:06.806Z"
    },
    {
      "id": 23,
      "title": "Some title",
      "notes": "These are notes",
      "base_amount": 2000,
      "is_disabled": false,
      "is_deleted": false,
      "createdAt": "2019-05-27T12:24:06.736Z",
      "updatedAt": "2019-07-23T11:20:23.695Z",
      "Categories.id": 5,
      "Categories.name": "Adventure",
      "Categories.is_disabled": false,
      "Categories.is_deleted": false,
      "Categories.createdAt": "2019-05-14T11:07:40.287Z",
      "Categories.updatedAt": "2019-05-14T11:07:40.287Z",
      "Categories.ExperienceCategory.experience_id": 23,
      "Categories.ExperienceCategory.category_id": 5,
      "Categories.ExperienceCategory.createdAt": "2019-05-27T12:24:06.806Z",
      "Categories.ExperienceCategory.updatedAt": "2019-05-27T12:24:06.806Z"
    }
  ]
}

您可以看到 Experience ID 23 重复了两次，因为有两个不同的类别。我可以在数组中获取类别吗？

提前致谢。

标签： node.jsexpresssequelize.js

解决方案

假设您在Experience模型文件中有以下关联：

Experience.belongsToMany(models.Category, { through: 'ExperienceCategory', as: 'categories' });

然后，您需要执行以下操作才能在您的体验请求中列出类别：

models.Experience.findAll({
 include: [
  { model: models.Category, as: 'categories' }
 ]
}).then(experiences => {
 res.json({experiences: experiences});
})

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