belongsTo(Sport::class); } public function element_group() { return $this->belongsTo(ElementGroup::class, 'element_id', 'element_id'); } public function element() { return $this->belongsTo(Element::class); } public function provider() { return $this->belongsTo(Provider::class); } public function add_by_method() { return $this->belongsTo(AddByMethod::class); } }