hasMany(Bill::class, 'cm_pro_id'); } public function hcpBills() { return $this->hasMany(Bill::class, 'hcp_pro_id'); } public function lastPayment() { return ProTransaction ::where('pro_id', $this->id) ->where('plus_or_minus', 'PLUS') ->orderBy('created_at', 'desc') ->first(); } }