新增單位管理以及一些功能修正

app/Http/Controllers/ProductController.php

@@ -3,6 +3,7 @@
 namespace App\Http\Controllers;
 
 use App\Models\Product;
+use App\Models\Unit;
 use Illuminate\Http\Request;
 use Inertia\Inertia;
 use Inertia\Response;
@@ -14,7 +15,7 @@ class ProductController extends Controller
      */
     public function index(Request $request): Response
     {
-        $query = Product::with('category');
+        $query = Product::with(['category', 'baseUnit', 'largeUnit', 'purchaseUnit']);
 
         if ($request->filled('search')) {
             $search = $request->search;
@@ -61,8 +62,10 @@ class ProductController extends Controller
         $categories = \App\Models\Category::where('is_active', true)->get();
 
         return Inertia::render('Product/Index', [
+            'products' => $products,
             'products' => $products,
             'categories' => $categories,
+            'units' => Unit::all(),
             'filters' => $request->only(['search', 'category_id', 'per_page', 'sort_field', 'sort_direction']),
         ]);
     }
@@ -77,15 +80,17 @@ class ProductController extends Controller
             'category_id' => 'required|exists:categories,id',
             'brand' => 'nullable|string|max:255',
             'specification' => 'nullable|string',
-            'base_unit' => 'required|string|max:50',
-            'large_unit' => 'nullable|string|max:50',
-            'conversion_rate' => 'required_with:large_unit|nullable|numeric|min:0.0001',
-            'purchase_unit' => 'nullable|string|max:50',
+
+            'base_unit_id' => 'required|exists:units,id',
+            'large_unit_id' => 'nullable|exists:units,id',
+            'conversion_rate' => 'required_with:large_unit_id|nullable|numeric|min:0.0001',
+            'purchase_unit_id' => 'nullable|exists:units,id',
         ], [
             'name.required' => '商品名稱為必填',
             'category_id.required' => '請選擇分類',
             'category_id.exists' => '所選分類不存在',
-            'base_unit.required' => '基本庫存單位為必填',
+            'base_unit_id.required' => '基本庫存單位為必填',
+            'base_unit_id.exists' => '所選基本單位不存在',
             'conversion_rate.required_with' => '填寫大單位時，換算率為必填',
             'conversion_rate.numeric' => '換算率必須為數字',
             'conversion_rate.min' => '換算率最小為 0.0001',
@@ -109,14 +114,24 @@ class ProductController extends Controller
      */
     public function update(Request $request, Product $product)
     {
-         $validated = $request->validate([
+        $validated = $request->validate([
             'name' => 'required|string|max:255',
             'category_id' => 'required|exists:categories,id',
             'brand' => 'nullable|string|max:255',
             'specification' => 'nullable|string',
-            'base_unit' => 'required|string|max:50',
-            'large_unit' => 'nullable|string|max:50',
-            'conversion_rate' => 'required_with:large_unit|nullable|numeric|min:0.0001',
+            'base_unit_id' => 'required|exists:units,id',
+            'large_unit_id' => 'nullable|exists:units,id',
+            'conversion_rate' => 'required_with:large_unit_id|nullable|numeric|min:0.0001',
+            'purchase_unit_id' => 'nullable|exists:units,id',
+        ], [
+            'name.required' => '商品名稱為必填',
+            'category_id.required' => '請選擇分類',
+            'category_id.exists' => '所選分類不存在',
+            'base_unit_id.required' => '基本庫存單位為必填',
+            'base_unit_id.exists' => '所選基本單位不存在',
+            'conversion_rate.required_with' => '填寫大單位時，換算率為必填',
+            'conversion_rate.numeric' => '換算率必須為數字',
+            'conversion_rate.min' => '換算率最小為 0.0001',
         ]);
 
         $product->update($validated);

app/Http/Controllers/UnitController.php

@@ -0,0 +1,70 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\Unit;
+use App\Models\Product; // Import Product to check for usage
+use Illuminate\Http\Request;
+
+class UnitController extends Controller
+{
+    /**
+     * Store a newly created resource in storage.
+     */
+    public function store(Request $request)
+    {
+        $validated = $request->validate([
+            'name' => 'required|string|max:255|unique:units,name',
+            'code' => 'nullable|string|max:50',
+        ], [
+            'name.required' => '單位名稱為必填項目',
+            'name.unique' => '該單位名稱已存在',
+            'name.max' => '單位名稱不能超過 255 個字元',
+            'code.max' => '單位代碼不能超過 50 個字元',
+        ]);
+
+        Unit::create($validated);
+
+        return redirect()->back()->with('success', '單位已建立');
+    }
+
+    /**
+     * Update the specified resource in storage.
+     */
+    public function update(Request $request, Unit $unit)
+    {
+        $validated = $request->validate([
+            'name' => 'required|string|max:255|unique:units,name,' . $unit->id,
+            'code' => 'nullable|string|max:50',
+        ], [
+            'name.required' => '單位名稱為必填項目',
+            'name.unique' => '該單位名稱已存在',
+            'name.max' => '單位名稱不能超過 255 個字元',
+            'code.max' => '單位代碼不能超過 50 個字元',
+        ]);
+
+        $unit->update($validated);
+
+        return redirect()->back()->with('success', '單位已更新');
+    }
+
+    /**
+     * Remove the specified resource from storage.
+     */
+    public function destroy(Unit $unit)
+    {
+        // Check if unit is used in any product
+        $isUsed = Product::where('base_unit_id', $unit->id)
+            ->orWhere('large_unit_id', $unit->id)
+            ->orWhere('purchase_unit_id', $unit->id)
+            ->exists();
+
+        if ($isUsed) {
+            return redirect()->back()->with('error', '該單位已被商品使用，無法刪除');
+        }
+
+        $unit->delete();
+
+        return redirect()->back()->with('success', '單位已刪除');
+    }
+}

app/Http/Middleware/HandleInertiaRequests.php

@@ -40,6 +40,10 @@ class HandleInertiaRequests extends Middleware
             'auth' => [
                 'user' => $request->user(),
             ],
+            'flash' => [
+                'success' => $request->session()->get('success'),
+                'error' => $request->session()->get('error'),
+            ],
         ];
     }
 }

app/Models/Product.php

@@ -17,10 +17,10 @@ class Product extends Model
         'category_id',
         'brand',
         'specification',
-        'base_unit',
-        'large_unit',
+        'base_unit_id',
+        'large_unit_id',
         'conversion_rate',
-        'purchase_unit',
+        'purchase_unit_id',
     ];
 
     protected $casts = [
@@ -35,6 +35,21 @@ class Product extends Model
         return $this->belongsTo(Category::class);
     }
 
+    public function baseUnit(): BelongsTo
+    {
+        return $this->belongsTo(Unit::class, 'base_unit_id');
+    }
+
+    public function largeUnit(): BelongsTo
+    {
+        return $this->belongsTo(Unit::class, 'large_unit_id');
+    }
+
+    public function purchaseUnit(): BelongsTo
+    {
+        return $this->belongsTo(Unit::class, 'purchase_unit_id');
+    }
+
     public function vendors(): \Illuminate\Database\Eloquent\Relations\BelongsToMany
     {
         return $this->belongsToMany(Vendor::class)->withPivot('last_price')->withTimestamps();

app/Models/Unit.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class Unit extends Model
+{
+    /** @use HasFactory<\Database\Factories\UnitFactory> */
+    use HasFactory;
+
+    protected $fillable = [
+        'name',
+        'code',
+    ];
+}