Express 包含where条件，但在包含之前保留所有结果

我在查询包含的内部时遇到问题

我所做的是

    const courses = await Course.findAll({
    subQuery: false,
    order: [ [ 'courseID', 'ASC' ] ],
    include: [
        {
            model: CourseAvailable,
            as: 'courseAvailable',
            where: {
                id: 350 // dummy condition only for asking here ( I had my purpose )
            }
        }
    ]
    });

以及输出

{
"success": true,
"data": [
    {
        "id": 20,
        "courseID": "MTH102",
        "courseName": "MATHEMATICS II",
        "required": "{MTH101}",
        "createdAt": "2020-05-19T17:30:44.085Z",
        "updatedAt": "2020-05-19T17:30:44.085Z",
        "courseAvailable": [
            {
                "id": 350,
                "courseID": "MTH102",
                "semester": 2,
                "credit": 3,
                "totalSeat": 150,
                "section": "7",
                "allowedGroup": "EET 1 A(0)",
                "day": "จ.",
                "start": "10.30",
                "end": "12.30",
                "classroom": "CB1103",
                "createdAt": "2020-05-20T15:22:50.176Z",
                "updatedAt": "2020-05-20T15:22:50.176Z"
            }
        ]
    }
  ]
}

从输出中，我知道在include中查询只会返回在include中查询到的课程（正如您所看到的，返回的数据中只有1门课程）

但我仍然希望在include中进行查询，使include仅在满足我的条件时才显示（如过滤include）

但问题是，我还想保留我的其他课程，这些课程不符合任何条件

预期产量

{
"success": true,
"data": [
    {
        "id": 19,
        "courseID": "MTH101",
        "courseName": "MATHEMATICS I",
        "required": null,
        "createdAt": "2020-05-19T17:30:44.085Z",
        "updatedAt": "2020-05-19T17:30:44.085Z",
        "courseAvailable": [] // showing empty array if none has met my query => still keep the data above
    },
    {
        "id": 20,
        "courseID": "MTH102",
        "courseName": "MATHEMATICS II",
        "required": "{MTH101}",
        "createdAt": "2020-05-19T17:30:44.085Z",
        "updatedAt": "2020-05-19T17:30:44.085Z",
        "courseAvailable": [
            {
                "id": 350,
                "courseID": "MTH102",
                "semester": 2,
                "credit": 3,
                "totalSeat": 150,
                "section": "7",
                "allowedGroup": "EET 1 A(0)",
                "day": "จ.",
                "start": "10.30",
                "end": "12.30",
                "classroom": "CB1103",
                "createdAt": "2020-05-20T15:22:50.176Z",
                "updatedAt": "2020-05-20T15:22:50.176Z"
            }
        ]
    }
  ]
}

---

如前所述，在include中使用where时，Sequilize将执行内部联接。您需要在include中设置属性

required:false

，以执行左连接。将您的查询更改为

const courses = await Course.findAll({
    subQuery: false,
    order: [ [ 'courseID', 'ASC' ] ],
    include: [
        {
            model: CourseAvailable,
            as: 'courseAvailable',
            where: {
                id: 350 // dummy condition only for asking here ( I had my purpose )
            },
            required: false
        }
    ]
    });

---

如前所述，在include中使用where时，Sequilize将执行内部联接。您需要在include中设置属性

required:false

，以执行左连接。将您的查询更改为

const courses = await Course.findAll({
    subQuery: false,
    order: [ [ 'courseID', 'ASC' ] ],
    include: [
        {
            model: CourseAvailable,
            as: 'courseAvailable',
            where: {
                id: 350 // dummy condition only for asking here ( I had my purpose )
            },
            required: false
        }
    ]
    });

---

这回答了我的问题，非常感谢。我以前以为我是这样做的，但我可能把它放错了地方。这回答了我的问题，非常感谢。我以前以为我是这样做的，但我可能把它放错地方了