feat: added product image to printing jobs api

api_v1/views/printing/test_printing_job_api.py

@@ -1151,3 +1151,50 @@ class PrintingJobAPITestCase(TestCase):
         self.assertEqual(len(completed_states), 1)
         self.assertEqual(completed_states[0]['state_name'], self.state1.name)
 
+    def test_list_printing_jobs_with_product_image_url(self):
+        """测试列表接口返回产品图片 URL（mdy_image_url 优先）"""
+        # 设置产品的 mdy_image_url
+        self.product.mdy_image_url = 'https://example.com/product.jpg'
+        self.product.save()
+        
+        job = printing_models.PrintingJob.objects.create(
+            printing_order=self.printing_order,
+            product=self.product,
+            quantity=100,
+            unit='米',
+            size='50*60',
+            pieces=10
+        )
+        
+        response = self.client.get('/api/v1/printing-jobs/')
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        
+        # 验证 product_image_url 字段存在且返回正确的 URL
+        result = response.data['results'][0]
+        self.assertIn('product_image_url', result)
+        self.assertEqual(result['product_image_url'], 'https://example.com/product.jpg')
+
+    def test_list_printing_jobs_product_image_url_none(self):
+        """测试产品无图片时 product_image_url 返回 None"""
+        # 确保产品没有图片
+        self.product.mdy_image_url = None
+        self.product.image = None
+        self.product.description = None
+        self.product.save()
+        
+        job = printing_models.PrintingJob.objects.create(
+            printing_order=self.printing_order,
+            product=self.product,
+            quantity=100,
+            unit='米',
+            size='50*60',
+            pieces=10
+        )
+        
+        response = self.client.get('/api/v1/printing-jobs/')
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        
+        # 验证 product_image_url 字段存在且为 None
+        result = response.data['results'][0]
+        self.assertIn('product_image_url', result)
+        self.assertIsNone(result['product_image_url'])