Laravel中的过滤器功能 [英] Filter Function in Laravel

问题描述

你好，我建立了一个过滤系统 因此，我有一个选择框，可以在其中选择我的选项，然后单击一个按钮，然后转到另一个页面，我可以在其中看到所有结果.

Hello i build a filter system so i have a select box where i can select my options and then click a button and come to another page where i can see all my results.

这是我控制器的一部分

public function getValues(Request $request){
            $typ=$request->get('typ');
            $stellentyp=$request->get('stellentyp');
            $bereich=$request->get('bereich');
            $abschluss=$request->get('abschluss');
            $view = 'user.'.$stellentyp;
            $row = DB::table('angebots')
            ->where('stellentyp', $stellentyp)
            ->count();
        $fwds = DB::table('angebots')
            ->where('stellentyp', 'Freiwilligendienst')
            ->where('typ', $typ)
            ->where('bereich', $bereich)
            ->where('abschluss', $abschluss)
            ->orderBy('stellenname', 'asc')
            ->get();
         $jobs = DB::table('angebots')
            ->where('stellentyp', 'Job')
            ->where('typ', $typ)
            ->where('abschluss', $abschluss)
            ->where('bereich', $bereich)
            ->orderBy('stellenname', 'asc')
            ->get();

但是我现在有一个问题 我希望如果我的字段为空，则不应该过滤

but i have a problem now i want that if my field is empty it should not filter

像这样

 if(empty($request->get('typ'))){}
 else{->where('typ', $typ)}

但是它不起作用我不知道如何使用if/else来收集我的数据库条目? 有谁知道它如何工作?

but it doesnt work i dont know how i can collect my database entries with a if/else? Does anyone know how it could work?

谢谢！

我这样更改了我的功能，但出现错误

i changed my function like this but i get a eerror

public function getValues(Request $request){
        $typ=$request->get('typ');
        $stellentyp=$request->get('stellentyp');
        $bereich=$request->get('bereich');
        $abschluss=$request->get('abschluss');
        $user = DB::table('users')->get();
        $angebots = DB::table('angebots') ->orderBy('stellenname', 'asc');
        if(!empty($request->get('stellentyp'))){
            $angebots->where('stellentyp', $stellentyp);
        }
        $angebots->get();
        $row = $angebots->count();
        return view('user/angebots', compact('typ', 'stellentyp', 'bereich', 'abschluss', 'row', 'angebots', 'user'));
    }

如果我把得到的东西放在这样的地方

if i put the get after this so like that

$angebots = DB::table('angebots') ->orderBy('stellenname', 'asc')->get();

我没有错误，但是如果我把它放在如果我看到此错误之后:

i have no error but if i put it after the if it shows me this error:

未定义的属性:Illuminate \ Database \ MySqlConnection :: $ firma(视图:C:\ wamp \ sites \ j4ylara \ resources \ views \ user \ angebots.blade.php)

Undefined property: Illuminate\Database\MySqlConnection::$firma (View: C:\wamp\sites\j4ylara\resources\views\user\angebots.blade.php)

这是我的观点:

{{$row}} Angebote insgesamt
        <div class="row">
            @foreach ($angebots as $angebot)
                <div class="col-12 col-md-6 col-lg-4 pt-4">
                    <div class="card offer-card">
                        <div class="card-image">
                            <img class="img-fluid" src="{{ asset('uploads/avatars/' . $user[$angebot->firma -1]->avatar) }}">
                        </div>
                        <div class="card-body">
                            <h4 class="text-j4y-dark praktikumstitel">{{ $angebot->stellenname }}</h4>
                            <a href="{{ route('angebot.details',['id'=>$angebot->firma]) }}">Jetzt mehr anzeigen »</a>
                        </div>
                    </div>
                </div>
            @endforeach
        </div>

如果我注释掉$ angebot变量，一切正常

if i comment out the variable $angebot everything works

所以我有变量$ row，它显示了我得到多少结果，如果我对其进行过滤，它会显示正确数量的结果

so i have the variable $row and it shows me how many results i get and if i filter it shows me the right number of results

但是如果foreach不起作用，我现在如何显示我的结果?

but how can i display my results now if the foreach doesnt work???

推荐答案

您很亲密.您需要等待->get()，直到ifs之后.之所以这样，是因为一旦执行get()，查询就会被执行，并且您无法再添加过滤器.

You are close. You need to wait with the ->get() until after the ifs. This is so because once you execute the get() the query is executed and you cannot add anymore filters.

$fwds = DB::table('angebots')
->where('stellentyp', $stellentyp)
->orderBy('stellenname', 'asc'); //The get is not needed yet 

if ($this->typ) {
    $fwds->where('typ', 'like', "%{$this->typ}%");
}

if ($this->bereich) {
    $fwds->where('bereich', 'like', "%{$this->bereich}%");
}

if ($this->abschluss) {
    $fwds->where('abschluss', 'like', "%{$this->abschluss}%");
}

$fwds = $fwds->get(); //Place it after the ifs

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