当条件为真时，Laravel在模型上返回空关系 [英] Laravel return empty relationship on model when condidtion is true

问题描述

我有一个模型，当发生条件时，我想在其中返回一个空值，但是当我尝试获取模型时:

I have a model where I want to return a empty value when a condition happens, but when I try to get the model:

Model::with('shop')->find(id);

我收到此错误:

对成员函数addEagerConstraints()的调用为空"

"Call to a member function addEagerConstraints() on null"

这是我正在尝试的代码:

This is the code I'm trying:

public function shop(){
    if(true) {
        return null;
    }
    return $this->belongsTo('App\Models\Shop');
}

当Laravel关系中的条件为真时，什么都不返回的正确方法是什么?

How is the proper way to return nothing when a condition is true on Laravel relationships?

推荐答案

我认为您可以使用此技巧-在满足条件时设置不可能的查询条件:

I think you could use this trick - set an impossible query condition when a condition met:

public function shop(){

    return $this->belongsTo('App\Models\Shop')->where(function($query) {

        if ($condition) {

            // I think this should do the trick
            $query->whereNull('id');
        }

    });

}

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