sdp_oid . '-' . $this->svc_oid; } // ---- Define Relationships ---- public function sdp(): BelongsTo { return $this->belongsTo(\App\Models\MplsSdp::class, 'sdp_id'); } public function service(): BelongsTo { return $this->belongsTo(\App\Models\MplsService::class, 'svc_id'); } }