Question

我想从三个表中检索数据：课程，能力和能力标准。以下查询几乎可以正常工作，但它不会带回关联的competency_standards表数据。

    $coursesAndComps = Course::with(
        array('competencies' => function($query)
        {
            Competency::with('competency_standards');
        })
    )->get()->toArray();

competencies表链接到courses表（competencies.course_id = course.id），competency_standards表链接到competencies表（competency_standards）。 compey_id = competency.id）。

返回的数组如下所示：

Array
(
[0] => Array
    (
        [id] => 1
        [name] => the first course
        [competencies] => Array
        (
            [0] => Array
            (
                [id] => 9
                [course_id] => 1
                [name] => first course comp 1 
            )

            [1] => Array
            (
                [id] => 10
                [course_id] => 1
                [name] => first course comp 2
            )

        )
    )

)

但在competencies数组中，我希望找到另一个名为competency_standards的数组，如下所示：

...

[0] => Array
    (
        [id] => 9
        [course_id] => 1
        [name] => first course comp 1 
        [competency_standards] => Array
            (
                [0] => Array
                (
                    [id] => 22
                    [competency_id] => 9
                    [name] => standard foo 
                )
                [1] => Array
                (
                    [id] => 23
                    [competency_id] => 9
                    [name] => standard bar 
                )
            )
    )

...

这可能吗？我是以错误的方式解决这个问题吗？

Answer 1

应该可以使用：

 $coursesAndComps = Course::with('competencies', 'competencies.standards')
                   ->get()->toArray();

但当然您需要在standards模型中定义Competency关系，以便将Competency与Standard

Laravel：嵌套“with（）”函数

1 个答案: