单独的控制器和列表？

Question

假设我的用户类型为“教师”，并且我有一个显示所有“教师”的列表页面。如何最好地做到这一点？我有以下内容：

$teachers = new Teachers;
$data = $teachers->getTeachers();

foreach($data as $teacher) {
    echo $teacher->name
}

我的单数页面是：

$teacher = new Teacher('Jane Doe');
echo $teacher->name;

相比：

$teachers = new Teachers;

$all = $teachers->getTeachers();

foreach($all as $teacher) {
    echo $teacher->name;
}

和我的奇异存在：

$teacher = $teachers->getTeacher('Jane Doe');
echo $teacher->name;

基本上，我应该为列表和单数设置单独的控制器/模型，还是将它们合并为一个？

Answer 1

您需要的是一个名为Teacher 的模型，它可用于从 db 获取所有或单个教师。当然模型也负责创建/更新/删除教师。

class Teacher { // this should extend a Model class which share common methods to all models

  public $id;
  public $name;

  public function __construct($id, $name)
  {
    $this->id = $id;
    $this->name = $name;
  }

  public static function find($id) // this is a common method
  {
    // query db to get the teacher with given ID
    // The results are assigned to $row variable

    return self::createFromArray($row);
  }

  public static function all()
  {
    // query db to get all the teachers

    $teachers = []; // instead of an array you can create a collection class which may have some useful methods

    foreach ($rows as $row) {
      $teachers[] = self::createFromArray($row);
    }

    return $teachers;
  }

  public static function get($attributes)
  {
    // you can build a query with where clause by given attributes (eg. if you want to search by name)
    // after getting the results you can use the same example as all() method
  }

  public static function createFromArray($fields) // this is a common method
  {
    return new self(...$fields); // ... operator since PHP 5.6
  }
}

在您的控制器中，您可以使用以下模型：

foreach (Teacher::all() as $teacher) {
    echo $teacher->name;
}

或

echo Teacher::find(1)->name; // echo the name of the teacher having ID 1

或

foreach (Teacher::get(['name' => 'John']) as $teacher) {
   echo $teacher->name;
}

这个例子的灵感来自 Laravel。您可以查看 Laravel 中如何使用这些模型来了解更多有关此概念的信息。

我只是给你一个关于如何创建和使用模型的小例子，但是你可以围绕这个想法尝试更多的东西。