Laravel通过中间表获取belongsTo

Question

考虑以下数据库方案：

companies
    -- id
    -- name

logos
    -- id
    -- active
    -- company_id
    -- image_id

images
    -- id
    -- filename
    -- path
    -- type

然后我在以这种方式定义的模型中有关系：

Company.php

public function logos() {
    return $this->hasMany('App\Models\Logo');
}

Logo.php

public function image() {
    $this->belongsTo('App\Models\Image');
}

现在我想根据其 ID 及其徽标和图像获取特定公司。所以我试图以这种方式获取它，但它抛出了错误：

Relationship 方法必须返回 Illuminate\Database\Eloquent\Relations\Relation 类型的对象

CompanyController.php

public function show($id) {
    $company = Company::findOrFail($id);
    $requester = JWTAuth::parseToken()->toUser();
    if( !$requester->hasRole('noc') && $requester->company_id != $company->id) {
        return $this->response->errorUnauthorized("You have no rights to view this company profile.");
    }

    // I am trying to fetch it this way //
    $company->logos;
    foreach ($company->logos as $logo) {
        return $logo->image;
    }
    return $this->response->array(compact('company'))->setStatusCode(200);
}

谁能帮帮我？ :) 谢谢！

Answer 1

使用nested eager loading:

$company = Company::with('logos.image')->where('id', $id)->first();