如何在 laravel Eloquent ORM 中为具有不同条件的多个模型创建连接查询

Question

我想为具有单独（模型）条件的多个模型创建连接查询。

我创建了以下查询：

select * from studentinformation as s left join studentattandence a on s.id =

 a.studentid where s.PersonalFirstName='Kathi' and s.PersonalLastName='irfan' 

and s.Age='2' and s.gender ='Male' and s.StudentCourse='1' and 

s.GuardianFirstName='test' and s.GuardianLastName = 'test' and a.date 

BETWEEN '2015-02-01' AND '2015-02-07'

studentinformation 模型名称表是“StudentAdmissionModel”。

studentattandence 模型名称表为“StudentAttandenceModel”。

我该如何做这个 laravel Eloquent ORM。

Answer 1

您需要在 StudentAdmissionModel 中声明两者之间的关系，如下所示：

class StudentAdmissionModel extends Eloquent {
    public function attendance()
    {
        // Assuming a one-to-one relationship
        return $this->hasOne('StudentAttandenceModel','studentid');
    }
}

然后你就可以使用 whereHas() 函数来查询关系了：

$admissions = StudentAdmissionModel::where('PersonalFirstName','=','Kathi')
->where('PersonalLastName','=','irfan')
->where('Age','=','2')
->where('gender','=','Male')
->where('StudentCourse','=','1')
->where('GuardianFirstName','=','test')
->where('GuardianLastName ','=','test')
->whereHas('attendance',function($q)
{
    $q->whereBetween('date', array('2015-02-01','2015-02-07'));
})
->with('attendance') // Optional eager loading, but recommended
->get();

您将能够访问这样的字段：

foreach( $admissions as $admission){
    echo $admission->gender;
    // or
    echo $admission->attendance->date;
}