feat: implement product stock management with automated inventory tracking during purchases

app/Http/Controllers/Admin/Manage/PurchaseController.php

@@ -56,6 +56,8 @@ public function store(PurchaseRequest $request): RedirectResponse
                     'unit_price' => $item['unit_price'],
                     'total_price' => $item['quantity'] * $item['unit_price'],
                 ]);
+
+                Product::find($item['product_id'])->increment('stock', $item['quantity']);
             }
 
             PurchaseItem::where('user_id', auth()->id())
@@ -89,6 +91,10 @@ public function update(PurchaseRequest $request, Purchase $purchase): RedirectRe
                 'total' => $total,
             ]);
 
+            foreach ($purchase->items as $item) {
+                $item->product->decrement('stock', $item->quantity);
+            }
+
             $purchase->items()->delete();
 
             foreach ($validated['items'] as $item) {
@@ -99,6 +105,8 @@ public function update(PurchaseRequest $request, Purchase $purchase): RedirectRe
                     'unit_price' => $item['unit_price'],
                     'total_price' => $item['quantity'] * $item['unit_price'],
                 ]);
+
+                Product::find($item['product_id'])->increment('stock', $item['quantity']);
             }
         });
 
@@ -107,7 +115,12 @@ public function update(PurchaseRequest $request, Purchase $purchase): RedirectRe
 
     public function destroy(Purchase $purchase): RedirectResponse
     {
-        $purchase->delete();
+        DB::transaction(function () use ($purchase) {
+            foreach ($purchase->items as $item) {
+                $item->product->decrement('stock', $item->quantity);
+            }
+            $purchase->delete();
+        });
 
         return redirect()->back()->with('success', 'Data berhasil dihapus');
     }
@@ -116,7 +129,15 @@ public function bulkDestroy(Request $request): RedirectResponse
     {
         $ids = $request->input('ids');
 
-        Purchase::whereIn('id', $ids)->delete();
+        DB::transaction(function () use ($ids) {
+            $purchases = Purchase::with('items')->whereIn('id', $ids)->get();
+            foreach ($purchases as $purchase) {
+                foreach ($purchase->items as $item) {
+                    $item->product->decrement('stock', $item->quantity);
+                }
+                $purchase->delete();
+            }
+        });
 
         return redirect()->back()->with('success', 'Data terpilih berhasil dihapus');
     }

app/Http/Controllers/Admin/Master/ProductController.php

@@ -87,6 +87,7 @@ public function update(ProductRequest $request, Product $product): RedirectRespo
             $product->update([
                 'name' => $validated['name'],
                 'description' => $validated['description'],
+                'stock' => $validated['stock'] ?? 0,
             ]);
 
             $product->categories()->sync($validated['category_ids'] ?? []);

app/Http/Requests/Admin/Master/ProductRequest.php

@@ -40,6 +40,7 @@ public function rules(): array
             'images.*' => ['image', 'max:5120'],
             'delete_image_ids' => ['nullable', 'array'],
             'delete_image_ids.*' => ['integer'],
+            'stock' => ['required', 'integer', 'min:0'],
         ];
     }
 }

app/Models/Product.php

@@ -27,6 +27,7 @@ protected function casts(): array
     {
         return [
             'is_active' => 'boolean',
+            'stock' => 'integer',
         ];
     }
 

database/migrations/2026_04_16_082802_create_products_table.php

@@ -16,6 +16,7 @@ public function up(): void
             $table->string('name', 100);
             $table->string('slug', 100);
             $table->text('description')->nullable();
+            $table->integer('stock')->default(0);
             $table->boolean('is_active')->default(true);
             $table->timestamp('created_at')->useCurrent();
             $table->timestamp('updated_at')->nullable()->useCurrentOnUpdate();

database/seeders/PurchaseSeeder.php

@@ -41,6 +41,8 @@ public function run(): void
                     'total_price' => $totalPrice,
                 ]);
 
+                $product->increment('stock', $quantity);
+
                 $total += $totalPrice;
             }
 

resources/js/pages/admin/master/product/edit.tsx

@@ -67,6 +67,7 @@ export default function ProductEdit({ product, categories }: { product: Product,
         thumbnail: File | null;
         images: File[];
         delete_image_ids: number[];
+        stock: string;
         _method: string;
     }>({
         name: product.name || '',
@@ -82,6 +83,7 @@ export default function ProductEdit({ product, categories }: { product: Product,
         thumbnail: null,
         images: [],
         delete_image_ids: [],
+        stock: product.stock?.toString() || '0',
         _method: 'PATCH',
     });
 
@@ -179,19 +181,36 @@ export default function ProductEdit({ product, categories }: { product: Product,
                                 <CardTitle>Informasi Produk</CardTitle>
                             </CardHeader>
                             <CardContent className="space-y-6">
-                                <Field>
+                                <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
-                                    <Label htmlFor="name" required>Nama</Label>
+                                    <Field>
-                                    <Input
+                                        <Label htmlFor="name" required>Nama</Label>
-                                        id="name"
+                                        <Input
-                                        name="name"
+                                            id="name"
-                                        value={data.name}
+                                            name="name"
-                                        onChange={e => setData('name', e.target.value)}
+                                            value={data.name}
-                                        autoComplete='off'
+                                            onChange={e => setData('name', e.target.value)}
-                                        placeholder='Contoh: Gamis Wanita'
+                                            autoComplete='off'
-                                        maxLength={100}
+                                            placeholder='Contoh: Gamis Wanita'
-                                    />
+                                            maxLength={100}
-                                    {errors.name && <p className="text-xs text-red-500">{errors.name}</p>}
+                                        />
-                                </Field>
+                                        {errors.name && <p className="text-xs text-red-500">{errors.name}</p>}
+                                    </Field>
+
+                                    <Field>
+                                        <Label htmlFor="stock" required>Stok</Label>
+                                        <NumericFormat
+                                            id="stock"
+                                            customInput={Input}
+                                            thousandSeparator="."
+                                            decimalSeparator=","
+                                            value={data.stock}
+                                            onValueChange={(values) => setData('stock', values.value)}
+                                            placeholder="0"
+                                            autoComplete='off'
+                                        />
+                                        {errors.stock && <p className="text-xs text-red-500">{errors.stock}</p>}
+                                    </Field>
+                                </div>
 
                                 <Field>
                                     <Label htmlFor="category_ids" required>Kategori</Label>

resources/js/pages/admin/master/product/partials/columns.tsx

@@ -105,6 +105,24 @@ export const getColumns = ({ onDelete, onToggleStatus, onPreviewImage }: ColumnP
         },
         meta: { title: "Harga" },
     },
+    {
+        accessorKey: "stock",
+        header: ({ column }) => (
+            <DataTableColumnHeader column={column} title="Stok" />
+        ),
+        cell: ({ row }) => {
+            const product = row.original;
+            
+            return (
+                <div className="flex items-center gap-2">
+                    <Badge variant={product.stock <= 10 ? "destructive" : "outline"} className='font-mono'>
+                        {product.stock}
+                    </Badge>
+                </div>
+            );
+        },
+        meta: { title: "Stok" },
+    },
     {
         accessorKey: "is_active",
         header: "Status",

resources/js/types/product.ts

@@ -25,6 +25,7 @@ export interface Product {
     created_at: string;
     updated_at: string;
     deleted_at: string | null;
+    stock: number;
     prices?: ProductPrice[];
     categories?: Category[];
     thumbnail_url?: string | null;