hasMany(Plant::class,'plant_id', 'plant_id'); return $this->belongsTo(Plant::class,'plant_id', 'plant_id'); } public function user(){ return $this->hasOneThrough(User::class, Plant::class, 'plant_id', 'user_id'); } public function EquipmentWorkHistory(){ return $this->hasMany(EquipmentWorkHistory::class, 'company_projects_id','company_projects_id'); } }