我正在尝试在Laravel 5中创建一个应用程序,该程序可以跟踪患者的体检,以便创建患者历史记录,我使用Eloquent作为模型抽象建议.

为此,我使用laravel迁移创建了三个表和一个枢轴表,如下表所示：

用户可以是Doctor或Administrators,他们输入他们进行的特定考试的患者分数结果,例如,我有一个数据透视表,其中包含三个与三个实体相关的外键：

>考试编号

> Patient_id

> user_id

在Eloquent中,我根据Laravel文档Many To Many建立了这些多对多模型,以支持建议的业务逻辑：

// Patient.php

class Patient extends Model

{

public function exams() {

return $this->belongsToMany('App\Exam', 'exam_patient');

}

}

// Exam.php

class Exam extends Model

{

public function patients()

{

return $this->belongsToMany('App\Patient', 'exam_patient');

}

public function users()

{

return $this->belongstoMany('App\User', 'exam_patient');

}

}

// User.php

class User extends Model

{

public function exams() {

return $this->belongsToMany('App\Exam', 'exam_patient');

}

}

在修补匠中,我尝试在进行重大更改之前模拟一个常见用例：医生对病人进行检查：

>>> $user= App\User::first()

=> App\User {#671

id: "1",

name: "Victor",

email: "",

created_at: "2015-10-10 18:33:54",

updated_at: "2015-10-10 18:33:54",

}

>>> $patient= App\Patient::first()

=> App\Patient {#669

id: "1",

username: "",

name: "Tony",

lastname: "",

birthday: "0000-00-00",

created_at: "2015-10-10 18:32:56",

updated_at: "2015-10-10 18:32:56",

}

>>> $exam= App\Exam::first()

=> App\Exam {#680

id: "1",

name: "das28",

title: "Das28",

created_at: "2015-10-10 18:31:31",

updated_at: "2015-10-10 18:31:31",

}

>>> $user->save()

=> true

>>> $patient->save()

=> true

>>> $exam->save()

=> true

问题是,当我尝试链接(或附加)至少两个模型时,出现以下错误：

>>> $patient->exams()->attach(1)

Illuminate\Database\QueryException with message

'SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a

child row: a foreign key constraint fails (`cliniapp`.`exam_patient`, CONSTRAINT

`exam_patient_user_id_foreign` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`)

ON DELETE CASCADE) (SQL: insert into `exam_patient` (`exam_id`, `patient_id`)

values (1, 1))'

如果我什至连不上两个模型,该如何链接这三个模型？修补匠是否可以通过任何方式大规模附加它们,以便可以将它们关联到我的数据透视表(exam_ Patient)中,而MySql不会显示该错误,或??者如果我在方法上出错了？任何帮助,我们将不胜感激.