Laravel - 根据特定条件从数据库中获取用户数据

Question

我有一个用户table，它存储我的用户和应用程序的名称table，它存储用户所做的所有应用程序...用户提出运输申请并打印该应用程序在管理员页面上，以便管理员可以知道哪个用户提出了申请。

如何检索申请用户的姓名？我如何获得所有申请面包车的用户？

一个用户有多个管理员如下：

用户模型：

public function admin(){
  return $this->hasMany('Martin\Models\admin');
}

管理员模型：

public function application()
{
    return hasMany('Martin\Models\Application');
}

应用程序table架构：

Schema::create('applications', function (Blueprint $table)
{
    $table->increments('id');
    $table->string('user_id')->nullable();
    $table->string('destination');
    $table->date('departure_date');
    $table->integer('Number_of_days_hired');
    $table->timestamp('departure_time')->nullable();
    $table->boolean('approved')->default(0);
    $table->timestamps();
});

Answer 1

$applications = Application::all();  //get all applications. Application is your Eloquent model of the Applications table

$userIds = $applications->pluck('user_id'); // get ids from all the users that applied

$names = User::whereIn($userIds)->pluck('name'); // name is equal to the name of the column in database which stores name of the User (you didn't specify that in your question)

foreach($names as $name) {
    // do something with name
}

更新

有两种方法可以找到申请特定事物的用户：

1. blade 文件:

@foreach($users as $user)
    @if($user->applied_for_van) // put your criteria for van application here
        <td>{{$user->name}}</td>
    @endif
@endforeach

2.1 获取所有用户的文件：

$users_who_applied_for_van = [];

foreach($users as $user) {
    if($user->applied_for_van) {
        $users_who_applied_for_van[] = $user; // this equal to array_push. add user to the array basically
    }
}

2.2 blade 文件:

    @foreach($users_who_applied_for_van as $user)
        <td>{{$user->name}}</td>
    @endforeach

Laravel - 根据特定条件从数据库中获取用户数据

Laravel - getting data of the user from database by specific criterion

laravel-5.3

用户模型：

管理员模型：

应用程序table架构：