Question

我与一个亚科有一个简单的关系，该亚科有很多属，每个亚科都有很多种。

所以：

物种通过属有一个亚科。亚科有很多属。

class Species extends Model
{
    /** Return the many-to-one relationship with the Genus model.
     * 
     * @return App\Models\Genus
     */
    public function genus()
    {
        return $this->belongsTo(Genus::class);
    }

    /** Return the one-to-one relationship with the Subfamily model through the Genus model.
     * 
     * @return App\Models\Subfamily
     */
    public function subfamily()
    {
        return $this->hasOneThrough(Subfamily::class, Genus::class);
    }

}

class Genus extends Model
{
    /** Returns the one-to-many relationship with the Species class
     * 
     * @return App\Models\Species
     */
    public function species()
    {
        return $this->hasMany(Species::class);
    }

    /** Returns the many-to-one relationship with the Subfamily class
     * 
     * @return App\Models\Subfamily
     */
    public function subfamily()
    {
        return $this->belongsTo(Subfamily::class);
    }
}

class Subfamily extends Model
{

    /** Returns the one-to-many relationship with the Genus class
     * 
     * @return App\Models\Genus
     */
    public function genera()
    {
        return $this->hasMany(Genus::class);
    }

    /** Returns the one-to-many relationship with the Species class through the Genus class
     * 
     * @return App\Models\Genus
     */
    public function species()
    {
        return $this->hasManyThrough(Species::class, Genus::class);
    }
}

尝试一下可以使我：

>>> $species->subfamily
BadMethodCallException with message 'Call to undefined method App/Models/Species::hasOneThrough()'

但是以某种方式在$ subfamily-> species关系中使用hasManyThrough（）可以正常工作！

Answer 1

您需要升级到Laravel 5.8才能使用hasOneThrough()。希望对您有所帮助！编码愉快。

Answer 2

您使用的是哪个laravel版本？ Laravel 5.8中是否引入了一个通行证

hasOneThrough（）关系给出“ BadMethodCallException，对未定义方法的调用[模型名称] :: hasOneThrough（）”

2 个答案: