Question

我有两个表，我使用'withRelated'查询bookshelfjs。如何按相关表中的列对结果进行排序？例如，我想按rankingLinks.id

订购所有结果

.fetchAll({withRelated: ['tickerSymbolLinks.tickerSymbol', 'rankingLinks', 'logoLinks.logo']})

看起来很简单但是我的头靠在墙上......

Answer 1

您实际上可以通过withRelated订购内容，但是，它只会在此特定属性中对结果进行排序。即：

new Participant().query(function(qb) {
    qb.orderBy('participants.id', 'desc'); // You don't have access to any "withRelated" models
}).fetchAll({
    withRelated: [{
        'courses': function(qb) {
            qb.orderBy('courses.id', 'desc');
        }
    }]
}).then(function(result) {
    res.json(result.toJSON());
});

此代码返回所有参与者，按其ID（降序）排序。在这个结果中，我按课程订购课程。结果如下：

[
     {
          "id": 3,
          "name": "Susan Doe",
          "created_at": 1429685077496,
          "updated_at": 1429685077496,
          "courses": [
               {
                    "id": 3,
                    "course_name": "Advanced JavaScript",
                    "duration": 80,
                    "_pivot_participant_id": 3,
                    "_pivot_course_id": 3,
                    "_pivot_level": null,
                    "_pivot_grade": null,
                    "_pivot_date_of_attendance": null
               },
               {
                    "id": 1,
                    "course_name": "iOS development",
                    "duration": 120,
                    "_pivot_participant_id": 3,
                    "_pivot_course_id": 1,
                    "_pivot_level": null,
                    "_pivot_grade": null,
                    "_pivot_date_of_attendance": null
               }
          ]
     },
     {
          "id": 2,
          "name": "Richard Doe",
          "created_at": 1429685077496,
          "updated_at": 1429685077496,
          "courses": [
               {
                    "id": 2,
                    "course_name": "Android development",
                    "duration": 60,
                    "_pivot_participant_id": 2,
                    "_pivot_course_id": 2,
                    "_pivot_level": null,
                    "_pivot_grade": null,
                    "_pivot_date_of_attendance": null
               },
               {
                    "id": 1,
                    "course_name": "iOS development",
                    "duration": 120,
                    "_pivot_participant_id": 2,
                    "_pivot_course_id": 1,
                    "_pivot_level": null,
                    "_pivot_grade": null,
                    "_pivot_date_of_attendance": null
               }
          ]
     },
     {
          "id": 1,
          "name": "John Doe",
          "created_at": 1429685077495,
          "updated_at": 1429685077495,
          "courses": [
               {
                    "id": 3,
                    "course_name": "Advanced JavaScript",
                    "duration": 80,
                    "_pivot_participant_id": 1,
                    "_pivot_course_id": 3,
                    "_pivot_level": null,
                    "_pivot_grade": null,
                    "_pivot_date_of_attendance": null
               },
               {
                    "id": 1,
                    "course_name": "iOS development",
                    "duration": 120,
                    "_pivot_participant_id": 1,
                    "_pivot_course_id": 1,
                    "_pivot_level": null,
                    "_pivot_grade": null,
                    "_pivot_date_of_attendance": null
               }
          ]
     }
]

现在，如果我想通过课程订购结果，我必须稍微更改一下查询。即：

new Course().query(function(qb) {
    qb.orderBy('courses.id', 'desc');
}).fetchAll({
    withRelated: ['participants']
}).then(function(result) {
    res.json(result.toJSON());
});

这会产生略微不同的结果，但需要有所需的顺序：

[
     {
          "id": 3,
          "course_name": "Advanced JavaScript",
          "duration": 80,
          "participants": [
               {
                    "id": 1,
                    "name": "John Doe",
                    "created_at": 1429685077495,
                    "updated_at": 1429685077495,
                    "_pivot_course_id": 3,
                    "_pivot_participant_id": 1,
                    "_pivot_level": null,
                    "_pivot_grade": null,
                    "_pivot_date_of_attendance": null
               },
               {
                    "id": 3,
                    "name": "Susan Doe",
                    "created_at": 1429685077496,
                    "updated_at": 1429685077496,
                    "_pivot_course_id": 3,
                    "_pivot_participant_id": 3,
                    "_pivot_level": null,
                    "_pivot_grade": null,
                    "_pivot_date_of_attendance": null
               }
          ]
     },
     {
          "id": 2,
          "course_name": "Android development",
          "duration": 60,
          "participants": [
               {
                    "id": 2,
                    "name": "Richard Doe",
                    "created_at": 1429685077496,
                    "updated_at": 1429685077496,
                    "_pivot_course_id": 2,
                    "_pivot_participant_id": 2,
                    "_pivot_level": null,
                    "_pivot_grade": null,
                    "_pivot_date_of_attendance": null
               }
          ]
     },
     {
          "id": 1,
          "course_name": "iOS development",
          "duration": 120,
          "participants": [
               {
                    "id": 1,
                    "name": "John Doe",
                    "created_at": 1429685077495,
                    "updated_at": 1429685077495,
                    "_pivot_course_id": 1,
                    "_pivot_participant_id": 1,
                    "_pivot_level": null,
                    "_pivot_grade": null,
                    "_pivot_date_of_attendance": null
               },
               {
                    "id": 2,
                    "name": "Richard Doe",
                    "created_at": 1429685077496,
                    "updated_at": 1429685077496,
                    "_pivot_course_id": 1,
                    "_pivot_participant_id": 2,
                    "_pivot_level": null,
                    "_pivot_grade": null,
                    "_pivot_date_of_attendance": null
               },
               {
                    "id": 3,
                    "name": "Susan Doe",
                    "created_at": 1429685077496,
                    "updated_at": 1429685077496,
                    "_pivot_course_id": 1,
                    "_pivot_participant_id": 3,
                    "_pivot_level": null,
                    "_pivot_grade": null,
                    "_pivot_date_of_attendance": null
               }
          ]
     }
]

我希望这有点帮助！

使用bookshelfjs按相关表格列排序结果

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