Question

我是Laravel的初学者，我想在老师登录后显示相关的学生记录。我已经实现了登录页面。

这是我的表

     Teachers
+----+--------------+
| id | teacher_name |
+----+--------------+
| 1  | John         |
+----+--------------+
| 2  | Tommy        |
+----+--------------+

     Students
+----+--------------+---------------+------------+
| id | student_name | course        | teacher_id |
+----+--------------+---------------+------------+
| 1  | Emma         | Learn Laravel | 1          |
+----+--------------+---------------+------------+
| 2  | Olivia       | Learn Java    | 2          |
+----+--------------+---------------+------------+
| 3  | Charlotte    | Learn Laravel | 1          |
+----+--------------+---------------+------------+

通常，我会在会话中获得教师ID并在PHP中执行此查询

SELECT * FROM Teachers, Students WHERE students.teacher_id = '$teacher_id';

如何在教师登录后搜索他的学生信息并将其显示在Laravel 5的简单表格中？

Answer 1

在Student模型中添加以下关系。

public function teacher ()
{
    return $this->belongsTo(Teacher::class);
}

然后在您的查询中

$teacherId = 123; // Set this
$studentWithTeachers = Student::with('teachers')->where('teacher_id', $teacherId);->get();

Answer 2

正如Gayan在答案中所说，添加与模型的关系应该是你的第一步：

学生模特：

public function teacher ()
{
    return $this->belongsTo(Teacher::class);
}

教师模型：

public function students ()
{
     return $this->hasMany(Student::class);
}

但与Gayan不同，让老师和学生一起学习更有意义：

$teacher = Teacher::with('students')->findOrFail($teacherID);

您需要将techer变量从控制器传递给您的视图：

return view('example.template', ['teacher', $teacher]);

并在您的刀片模板中显示如下内容：

<table>
    @forelse($teacher->students as $student)
         <tr>
             <td>{{ $student->name }}</td>
         </tr>
    @empty
         <tr>
             <td>No Students found</td>
         </tr>
    @endforelse
</table>

如何搜索＆amp;根据用户ID显示相对记录

2 个答案: