think\Model::hasMany PHP Method

    public function hasMany($model, $foreignKey = '', $localKey = '', $alias = [])
    {
        // 记录当前关联信息
        $model = $this->parseModel($model);
        $localKey = $localKey ?: $this->getPk();
        $foreignKey = $foreignKey ?: Loader::parseName($this->name) . '_id';
        return $this->relation()->hasMany($model, $foreignKey, $localKey, $alias);
    }