'integer', 'sent_at' => 'datetime', 'viewed_at' => 'datetime', 'notified_at' => 'datetime', 'responded_at' => 'datetime', ]; public function inquiry() { return $this->belongsTo(PriceInquiry::class, 'price_inquiry_id'); } public function contact() { return $this->belongsTo(Contact::class, 'contact_id'); } public function user() { return $this->belongsTo(User::class, 'user_id'); } }