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 redirectToFirst()
{
$kriteria = Kriteria::orderBy('kode')->first();
if (! $kriteria) {
return redirect()
->route('kriteria.index')
->withErrors('Tambahkan kriteria terlebih dahulu.');
}
return redirect()
->route('perbandingan-alternatif.index', $kriteria);
}
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();
$request->validate([
'nilai' => ['required', 'array'],
'nilai.*.*' => [
'required',
Rule::in($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"),
]);
}
}
Alternatif::query()->update([
'nilai_akhir' => null,
'ranking' => null,
]);
});
return redirect()
->route('perbandingan-alternatif.index', $kriteria)
->with('success', 'Perbandingan alternatif berhasil disimpan.');
}
}
Route
Tambahkan pada grup auth:
use App\Http\Controllers\PerbandinganAlternatifController;
Route::get(
'/perbandingan-alternatif',
[PerbandinganAlternatifController::class, 'redirectToFirst']
)->name('perbandingan-alternatif.first');
Route::get(
'/perbandingan-alternatif/{kriteria}',
[PerbandinganAlternatifController::class, 'index']
)->name('perbandingan-alternatif.index');
Route::post(
'/perbandingan-alternatif/{kriteria}',
[PerbandinganAlternatifController::class, 'store']
)->name('perbandingan-alternatif.store');
Tambahkan Menu Perbandingan Alternatif
Pada resources/views/layouts/app.blade.php, tambahkan:
<a class="nav-link text-white"
href="{{ route('perbandingan-alternatif.first') }}">
Perbandingan Alternatif
</a>
Route tersebut akan mengarahkan pengguna ke kriteria pertama melalui controller, sehingga layout tidak melakukan query database langsung.
View
Buat resources/views/perbandingan-alternatif/index.blade.php:
@extends('layouts.app')
@section('title', 'Perbandingan Alternatif')
@section('content')
<h1 class="h4 mb-3">Perbandingan Alternatif</h1>
<div class="mb-3">
<label class="form-label">Pilih Kriteria</label>
<select class="form-select"
onchange="if(this.value) window.location=this.value">
@foreach($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.
Checkpoint
Pastikan:
- Input menggunakan dropdown skala AHP.
- Nilai pecahan seperti
1/3dapat dipilih langsung. - Nilai kebalikan dihitung otomatis.
- Semua kriteria memiliki perbandingan alternatif.
- CR setiap matriks ≤ 0,1.