查询至少有1个关联，但返回全部 [英] Query where there is at least 1 association, but return all

问题描述

我已经创建了此记录，您可以看到它有2个标记-tag1和tag2

{
  "id": "d87de1d9-b048-4867-92fb-a84dca59c87e",
  "name": "Test Name",
  "tags": [
    {
      "id": "fa0ca8fd-eff4-4e58-8bb0-a1ef726f01d4",
      "name": "tag1",
      "organizationId": "d87de1d9-b048-4867-92fb-a84dca59c87e",
      "updatedAt": "2018-12-05T18:53:56.867Z",
      "createdAt": "2018-12-05T18:53:56.867Z"
    },
    {
      "id": "66e758af-9907-4278-8c4f-f8fb2bf9aea9",
      "name": "tag2",
      "organizationId": "d87de1d9-b048-4867-92fb-a84dca59c87e",
      "updatedAt": "2018-12-05T18:53:56.867Z",
      "createdAt": "2018-12-05T18:53:56.867Z"
    }
  ],
  "updatedAt": "2018-12-05T18:53:56.860Z",
  "createdAt": "2018-12-05T18:53:56.860Z"
}

我要编写一个查询，该查询查找包含tag1的组织，并返回包含所有标记的整个组织。

我当前有此查询，它只返回与查询匹配的标记记录，而不是返回所有标记。

db.organization.findAll({
  include: {
    model: db.tag,
    where: { name: 'tag1' }
  }
})

并产生此结果

[
  {
    "id": "3d03d74e-82ec-485e-aa29-abe9e8b0f0e9",
    "name": "Test Name",
    "createdAt": "2018-12-05T19:29:40.685Z",
    "updatedAt": "2018-12-05T19:29:40.685Z",
    "tags": [
      {
        "id": "75dc9cd2-5e20-4aa6-b86e-cbaa2c896d57",
        "name": "tag1", <-- NOTE THAT ONLY TAG1 IS IN THE RESULTS EVEN THOUGH THERE SHOULD BE ANOTHER TAG OBJECT RETURNED
        "createdAt": "2018-12-05T19:29:40.694Z",
        "updatedAt": "2018-12-05T19:29:40.694Z",
        "organizationId": "3d03d74e-82ec-485e-aa29-abe9e8b0f0e9"
      }
    ]
  }
]

如何编写查询来执行此操作？

推荐答案

我搜索了很多关于此主题的信息，我认为最有效的方法(在本例中)是建立一个用于过滤的基本关联和一个用于接收数据的关联

关联文件

// This is for filtering
organization.hasMany(tag, {
  foreignKey: 'organizationId',
});

// This one is for receiving data after filtering
organization.hasMany(tag, {
  foreignKey: 'organizationId',
  as: 'tags',
});

控制器

const results = await db.organization.findAll({
  include: [{
    model: db.tag,
    where: { name: 'tag1' },
    attributes: [], // remove 'Tag' property from results
  }, {
    model: db.tag,
    as: 'tags',
  }],
});

console.log(results);

console.log(results);将返回：

[
  {
    "id": "...",
    "name": "Organization Test Name",
    "createdAt": "...",
    "updatedAt": "...",
    // "Tag": [ // This property was removed by 'attributes: []'
    //   {
    //     "id": "...",
    //     "name": "tag1",
    //     "organizationId": "..."
    //     "createdAt": "...",
    //     "updatedAt": "...",
    //   },
    // ],
    "tags": [
      {
        "id": "...",
        "name": "tag1",
        "organizationId": "..."
        "createdAt": "...",
        "updatedAt": "...",
      },
      {
        "id": "...",
        "name": "tag1",
        "organizationId": "..."
        "createdAt": "...",
        "updatedAt": "...",
      }
    ]
  }
]

GitHub的部分资源：Can't exclude association's fields from select statement in sequelize #3664

这篇关于查询至少有1个关联，但返回全部的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！