chore(admin-ui): dedupe orders show back links and keep context

resources/views/admin/orders/show.blade.php

@@ -7,6 +7,12 @@
 @php
     $incomingBack = (string) request()->query('back', '');
     $safeBackForLinks = \App\Support\BackUrl::sanitizeForLinks($incomingBack);
+
+    // back 参数用于“返回上一页（保留上下文）”，但 back 本身不应再包含 back（避免无限嵌套导致 URL 膨胀）
+    $selfWithoutBack = \App\Support\BackUrl::selfWithoutBack();
+
+    // 去重降噪：仅在没有 incoming back 时，提供“返回订单列表（保留上下文）”入口
+    $ordersIndexUrl = \App\Support\BackUrl::withBack('/admin/orders', $selfWithoutBack);
 @endphp
 
 <div class="page-header mb-20" data-page="admin.orders.show">
@@ -17,9 +23,10 @@
         </div>
         <div class="page-header-actions">
             @if($safeBackForLinks)
-                <a class="btn btn-secondary btn-sm" href="{!! $safeBackForLinks !!}">← 返回上一页（保留上下文）</a>
+                <a class="btn btn-secondary btn-sm" href="{!! $safeBackForLinks !!}">返回上一页（保留上下文）</a>
+            @else
+                <a class="btn btn-secondary btn-sm" href="{!! $ordersIndexUrl !!}">返回订单列表（保留上下文）</a>
             @endif
-            <a class="btn btn-secondary btn-sm" href="/admin/orders">返回订单列表</a>
         </div>
     </div>
 

tests/Feature/AdminOrdersShowBackLinkDedupeTest.php

@@ -0,0 +1,104 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Merchant;
+use App\Models\Order;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Arr;
+use Tests\TestCase;
+
+class AdminOrdersShowBackLinkDedupeTest extends TestCase
+{
+    use RefreshDatabase;
+
+    protected function loginAsPlatformAdmin(): void
+    {
+        $this->seed();
+
+        $this->post('/admin/login', [
+            'email' => 'platform.admin@demo.local',
+            'password' => 'Platform@123456',
+        ])->assertRedirect('/admin');
+    }
+
+    public function test_show_should_render_only_one_back_entry_when_incoming_back_present(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $merchant = Merchant::query()->firstOrFail();
+
+        $order = Order::query()->create([
+            'merchant_id' => $merchant->id,
+            'user_id' => null,
+            'order_no' => 'O_SHOW_BACK_DEDUPE_0001',
+            'status' => 'pending',
+            'platform' => 'pc',
+            'payment_channel' => 'manual',
+            'payment_status' => 'unpaid',
+            'device_type' => 'pc',
+            'product_amount' => 10,
+            'discount_amount' => 0,
+            'shipping_amount' => 0,
+            'pay_amount' => 10,
+            'buyer_name' => '张三',
+            'buyer_phone' => '13800000000',
+            'buyer_email' => 'buyer@example.com',
+            'remark' => 'test',
+            'paid_at' => null,
+            'shipped_at' => null,
+            'completed_at' => null,
+        ]);
+
+        $back = '/admin/orders?' . Arr::query(['status' => 'pending']);
+
+        $res = $this->get('/admin/orders/' . $order->id . '?back=' . urlencode($back));
+        $res->assertOk();
+
+        $res->assertSee('返回上一页（保留上下文）');
+        $res->assertDontSee('返回订单列表（保留上下文）');
+        $res->assertDontSee('返回订单列表</a>', false);
+    }
+
+    public function test_show_should_render_back_to_orders_index_with_context_when_no_incoming_back(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $merchant = Merchant::query()->firstOrFail();
+
+        $order = Order::query()->create([
+            'merchant_id' => $merchant->id,
+            'user_id' => null,
+            'order_no' => 'O_SHOW_BACK_DEDUPE_0002',
+            'status' => 'pending',
+            'platform' => 'pc',
+            'payment_channel' => 'manual',
+            'payment_status' => 'unpaid',
+            'device_type' => 'pc',
+            'product_amount' => 10,
+            'discount_amount' => 0,
+            'shipping_amount' => 0,
+            'pay_amount' => 10,
+            'buyer_name' => '李四',
+            'buyer_phone' => '13800000001',
+            'buyer_email' => 'buyer2@example.com',
+            'remark' => 'test',
+            'paid_at' => null,
+            'shipped_at' => null,
+            'completed_at' => null,
+        ]);
+
+        $res = $this->get('/admin/orders/' . $order->id);
+        $res->assertOk();
+
+        $res->assertSee('返回订单列表（保留上下文）');
+
+        $expectedBack = '/admin/orders/' . $order->id;
+        $expectedIndexUrl = '/admin/orders?' . Arr::query([
+            'back' => $expectedBack,
+        ]);
+
+        $res->assertSee($expectedIndexUrl, false);
+        $res->assertDontSee('back%3D', false);
+    }
+}