LabWork05 vrode work

src/main/java/ru/ulstu/is/sbapp/HardwareShop/controller/ProductMvcController.java

@@ -48,21 +48,31 @@ public class ProductMvcController {
     }
 
     @GetMapping("filter")
-    public String FilterMethod(@RequestParam(required = false) Long manufacturerid, Model model, @RequestParam(name = "selected", required = false)List<ManufacturerDTO> selected) {
-        if (manufacturerid != null && manufacturerid != 0) {
-            if (selected == null) {
-                selected = new ArrayList<>();
-            }
-            selected.add(new ManufacturerDTO(manufacturerService.findManufacturer(manufacturerid)));
-        }
-        model.addAttribute("selected", selected);
+    public String FilterMethod(Model model, @RequestParam(name = "selected", required = false)List<Long> selected) {
+        if(selected == null) {
             model.addAttribute("manufacturers", manufacturerService.findAllManufacturers()
                     .stream()
                     .map(ManufacturerDTO::new)
                     .toList());
+            model.addAttribute("selected", selected);
             return "product-filter";
         }
 
+        List<ProductDTO> productDTOS;
+        List<ManufacturerDTO> manufacturerDTOS = new ArrayList<>();
+
+        for(int i = 0; i < selected.size(); ++i) {
+            manufacturerDTOS.add(new ManufacturerDTO(manufacturerService.findManufacturer(selected.get(i))));
+        }
+        productDTOS = productService.getProductsFilter(manufacturerDTOS)
+                .stream()
+                .map(ProductDTO::new)
+                .toList();
+
+        model.addAttribute("products", productDTOS);
+        return "products";
+    }
+
     @GetMapping(value = {"/update", "/update/{id}"})
     public String updateProduct(@PathVariable(required = false) Long id,
                              Model model) {

src/main/java/ru/ulstu/is/sbapp/HardwareShop/services/ProductService.java

@@ -137,6 +137,7 @@ public class ProductService {
         }
 
         List<Product> filter = findAllProducts();
+        List<Product> result = new ArrayList<>();
 
         for(Product product : filter) {
             boolean flag = false;
@@ -146,12 +147,12 @@ public class ProductService {
                     break;
                 }
             }
-            if (!flag)
+            if (flag)
             {
-                filter.remove(product);
+                result.add(product);
             }
         }
 
-        return filter;
+        return result;
     }
 }

src/main/resources/templates/product-filter.html

@@ -36,9 +36,9 @@
       </tbody>
     </table>
   </div>
-  <form th:action="@{/product/filter(selected=${selected})}" enctype="manufacturerid/form-data" method="get">
+  <form th:action="@{/product/filter}" enctype="manufacturerid/form-data" method="get">
     <div class="input-group mb-3">
-      <select class="form-select" th:name="manufacturerid">
+      <select name="selected" class="form-select" multiple="multiple">
         <option th:each="manufacturer, iterator: ${manufacturers}" th:value="${manufacturer.id}" th:text="${manufacturer.name}"></option>
       </select>
       <button class="btn btn-outline-secondary" type="submit">Добавить</button>