Bagian 4 dari seri

Perbandingan Alternatif pada Setiap Kriteria AHP Laravel

Diterbitkan 18 September 2026

Buat Controller

php artisan make:controller PerbandinganAlternatifController

app/Http/Controllers/PerbandinganAlternatifController.php:

<?php

namespace App\Http\Controllers;

use App\Models\Alternatif;
use App\Models\Kriteria;
use App\Models\PerbandinganAlternatif;
use App\Services\AhpService;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Validation\Rule;

class PerbandinganAlternatifController extends Controller
{
    private array $skalaAhp = [
        0.111111,
        0.125,
        0.142857,
        0.166667,
        0.2,
        0.25,
        0.333333,
        0.5,
        1,
        2,
        3,
        4,
        5,
        6,
        7,
        8,
        9,
    ];

    public function index(Kriteria $kriteria, AhpService $ahp)
    {
        $alternatif = Alternatif::orderBy('kode')->get();

        $records = PerbandinganAlternatif::where(
            'kriteria_id',
            $kriteria->id
        )->get();

        $ids = $alternatif->pluck('id')->all();

        $matrix = $ids
            ? $ahp->matrix(
                $ids,
                $records,
                'alternatif_1_id',
                'alternatif_2_id'
            )
            : [];

        $hasil = count($ids) >= 2
            ? $ahp->priority($matrix, $ids)
            : null;

        $konsistensi = $hasil
            ? $ahp->consistency($matrix, $hasil['weights'], $ids)
            : null;

        $semuaKriteria = Kriteria::orderBy('kode')->get();

        return view('perbandingan-alternatif.index', compact(
            'kriteria',
            'semuaKriteria',
            'alternatif',
            'matrix',
            'hasil',
            'konsistensi'
        ));
    }

    public function store(Request $request, Kriteria $kriteria)
    {
        $alternatif = Alternatif::orderBy('kode')->get();
        $ids = $alternatif->pluck('id')->all();

        $request->validate([
            'nilai' => ['required', 'array'],
            'nilai.*.*' => [
                'required',
                'numeric',
                Rule::in($this->skalaAhp),
            ],
        ]);

        DB::transaction(function () use ($request, $kriteria, $ids) {
            PerbandinganAlternatif::where(
                'kriteria_id',
                $kriteria->id
            )->delete();

            for ($i = 0; $i < count($ids); $i++) {
                for ($j = $i + 1; $j < count($ids); $j++) {
                    $a = $ids[$i];
                    $b = $ids[$j];

                    PerbandinganAlternatif::create([
                        'kriteria_id' => $kriteria->id,
                        'alternatif_1_id' => $a,
                        'alternatif_2_id' => $b,
                        'nilai' => (float) $request->input("nilai.$a.$b"),
                    ]);
                }
            }
        });

        return redirect()
            ->route('perbandingan-alternatif.index', $kriteria)
            ->with('success', 'Perbandingan alternatif berhasil disimpan.');
    }
}

Route

Tambahkan pada grup auth:

use App\Http\Controllers\PerbandinganAlternatifController;

Route::get(
    '/perbandingan-alternatif/{kriteria}',
    [PerbandinganAlternatifController::class, 'index']
)->name('perbandingan-alternatif.index');

Route::post(
    '/perbandingan-alternatif/{kriteria}',
    [PerbandinganAlternatifController::class, 'store']
)->name('perbandingan-alternatif.store');

Tambahkan Menu Perbandingan Alternatif

Karena route membutuhkan satu kriteria, arahkan menu ke kriteria pertama.

Pada resources/views/layouts/app.blade.php, tambahkan:

@php
    $kriteriaPertama = \App\Models\Kriteria::orderBy('kode')->first();
@endphp

@if($kriteriaPertama)
    <a class="nav-link text-white"
       href="{{ route('perbandingan-alternatif.index', $kriteriaPertama) }}">
        Perbandingan Alternatif
    </a>
@endif

View

Buat resources/views/perbandingan-alternatif/index.blade.php:

@extends('layouts.app')

@section('title', 'Perbandingan Alternatif')

@section('content')
<h1 class="h4 mb-3">Perbandingan Alternatif</h1>

<div class="mb-3">
    <label class="form-label">Pilih Kriteria</label>
    <select class="form-select"
            onchange="if(this.value) window.location=this.value">
        @foreach($semuaKriteria as $item)
            <option
                value="{{ route('perbandingan-alternatif.index', $item) }}"
                @selected($item->id === $kriteria->id)>
                {{ $item->kode }} - {{ $item->nama }}
            </option>
        @endforeach
    </select>
</div>

<div class="alert alert-info">
    Kriteria aktif:
    <strong>{{ $kriteria->kode }} - {{ $kriteria->nama }}</strong>
</div>

@php
    $skalaAhp = [
        '0.111111' => '1/9',
        '0.125' => '1/8',
        '0.142857' => '1/7',
        '0.166667' => '1/6',
        '0.2' => '1/5',
        '0.25' => '1/4',
        '0.333333' => '1/3',
        '0.5' => '1/2',
        '1' => '1',
        '2' => '2',
        '3' => '3',
        '4' => '4',
        '5' => '5',
        '6' => '6',
        '7' => '7',
        '8' => '8',
        '9' => '9',
    ];
@endphp

<form method="POST"
      action="{{ route('perbandingan-alternatif.store', $kriteria) }}">
    @csrf

    <div class="card border-0 shadow-sm mb-4">
        <div class="card-body table-responsive">
            <table class="table table-bordered text-center align-middle">
                <thead>
                    <tr>
                        <th>Alternatif</th>
                        @foreach($alternatif as $kolom)
                            <th>{{ $kolom->kode }}</th>
                        @endforeach
                    </tr>
                </thead>
                <tbody>
                    @foreach($alternatif as $i => $baris)
                        <tr>
                            <th>{{ $baris->kode }}</th>

                            @foreach($alternatif as $j => $kolom)
                                <td>
                                    @if($i === $j)
                                        1
                                    @elseif($i < $j)
                                        @php
                                            $nilaiAktif = old(
                                                "nilai.{$baris->id}.{$kolom->id}",
                                                $matrix[$baris->id][$kolom->id] ?? 1
                                            );
                                        @endphp

                                        <select
                                            name="nilai[{{ $baris->id }}][{{ $kolom->id }}]"
                                            class="form-select"
                                            required>
                                            @foreach($skalaAhp as $value => $label)
                                                <option
                                                    value="{{ $value }}"
                                                    @selected(abs((float) $nilaiAktif - (float) $value) < 0.000001)>
                                                    {{ $label }}
                                                </option>
                                            @endforeach
                                        </select>
                                    @else
                                        {{ number_format(
                                            $matrix[$baris->id][$kolom->id] ?? 1,
                                            4
                                        ) }}
                                    @endif
                                </td>
                            @endforeach
                        </tr>
                    @endforeach
                </tbody>
            </table>

            <button class="btn btn-primary">
                Simpan dan Hitung
            </button>
        </div>
    </div>
</form>

@if($hasil)
<div class="card border-0 shadow-sm">
    <div class="card-body">
        <h2 class="h5">Bobot Alternatif</h2>

        <table class="table table-bordered">
            <thead>
                <tr>
                    <th>Alternatif</th>
                    <th>Bobot</th>
                </tr>
            </thead>
            <tbody>
                @foreach($alternatif as $item)
                    <tr>
                        <td>{{ $item->kode }} - {{ $item->nama }}</td>
                        <td>
                            {{ number_format(
                                $hasil['weights'][$item->id],
                                6
                            ) }}
                        </td>
                    </tr>
                @endforeach
            </tbody>
        </table>

        <p>
            CR:
            <strong>
                {{ number_format($konsistensi['cr'], 6) }}
            </strong>
        </p>

        @if($konsistensi['cr'] <= 0.1)
            <div class="alert alert-success mb-0">
                Matriks konsisten.
            </div>
        @else
            <div class="alert alert-danger mb-0">
                Matriks belum konsisten.
            </div>
        @endif
    </div>
</div>
@endif
@endsection

Cara Input

Lakukan perbandingan alternatif untuk setiap kriteria.

Contoh:

Kriteria C1 - Harga
A1 vs A2
A1 vs A3
A2 vs A3

Nilai dipilih melalui dropdown skala AHP:

1/9, 1/8, 1/7, 1/6, 1/5, 1/4, 1/3, 1/2,
1,
2, 3, 4, 5, 6, 7, 8, 9

Setiap matriks sebaiknya memiliki CR ≤ 0,1.

Tutorial AHP Laravel Perbandingan Alternatif

Checkpoint

Pastikan:

Input menggunakan dropdown skala AHP.
Nilai pecahan seperti 1/3 dapat dipilih langsung.
Nilai kebalikan dihitung otomatis.
Semua kriteria memiliki perbandingan alternatif.
CR setiap matriks ≤ 0,1.

Lanjut: Perhitungan Nilai Akhir dan Ranking AHP