查询关系存在，如何根据数组长度添加条件 [英] Querying Relationship Existence, how to add conditions depending on an array length

问题描述

我想通过存储在单独表(在此示例中为tapp)中的某些特征来过滤项目(在这种情况下为pubs)，并且两者都与pub_tapps相关.

I would like to filter an item (pubs, in this case) by some characteristics that are stored in a separate table (tapps, in this case), and both are related by pub_tapps.

我有以下表格:酒吧，小吃，pub_tapps(pub_id，tapp_id)

I have the following tables: pubs, tapps, pub_tapps(pub_id, tapp_id)

Pub和Tapp之间的关系如下:

The relation between Pub and Tapp is the following:

 public function pubTapps()
{
    return $this->belongsToMany(Tapp::class, 'pub_tapps');
}

在我的Pub模型中，我尝试对数组$ request = [5,8，7]进行以下测试:

in my Pub model I tried the following testing for an array $request=[5,8, 7]:

public function pubsFilteredByTapps(FilteredTappsPubsRequest $request)
{
    $tapps_chosen = $request->get('tapps');

    $tapps_chosen = is_string($tapps_chosen) ? explode(',', str_replace('"', '', $tapps_chosen)) : $tapps_chosen;

    return Pub::whereHas('pubTapps', function($query) use($tapps_chosen) {
        $query->where('tapp_id', $tapps_chosen[0]);
    })
        ->whereHas('pubTapps', function($query) use($tapps_chosen) {
            $query->where('tapp_id', $tapps_chosen[1]);
        })
        ->whereHas('pubTapps', function($query) use($tapps_chosen) {
            $query->where('tapp_id', $tapps_chosen[2]);
        })
        ->get();
}

这很好，但是对于给定的3维数组...

This is working perfectly, but for a given 3 dimensional array...

如何处理长度为n的数组?

How can I do for an array of an n length??

我尝试了这个，但是根本不起作用(返回一个空数组):

I tried this, but doesn't work at all (returns an empty array):

return $pubs = Pub::whereHas('pubTapps', function ($query) use 
     ($tapps_chosen) {

        foreach ($tapps_chosen as $tappId) {
            $query->where('tapp_id', $tappId);
      }
       })->get();

我该怎么办???任何使它起作用的想法?

What would I have to do??? Any ideas to make it work??

非常感谢！

推荐答案

使用此:

$query = Pub::query();
foreach ($tapps_chosen as $tappId) {
    $query->whereHas('pubTapps', function($query) use($tappId) {
        $query->where('tapp_id', $tappId);
    });
}
return $query->get();

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