adds

demo/src/main/java/com/example/demo/supply/Order/OrderMvcController.java

@@ -10,6 +10,8 @@ import org.springframework.validation.BindingResult;
 import org.springframework.web.bind.annotation.*;
 
 import javax.validation.Valid;
+import java.sql.Array;
+import java.util.ArrayList;
 
 @Controller
 @RequestMapping("/order")

demo/src/main/resources/templates/order-add.html

@@ -21,15 +21,13 @@
         <option th:each="value: ${suppliers}" th:selected="${selectedSupplier != null and selectedSupplier == value.id}" th:value="${value.id}" th:text=" ${value.name}"></option>
       </select>
     </div>
-    <p class="d-flex justify-content-between">
-      <label>Продукты:</label>
-      <div th:each="product : ${products}">
-        <input type="checkbox" name="genres" th:text="${product.name} + '(Цена: ' + ${product.cost} + ')  '"
-               th:value="${product.id} "
-               th:field="*{productsId}"
-        />
-      </div>
-    </p>
+
+    <label>Продукты:</label>
+    <select id="author" class="form-select" multiple size="6" th:field="*{productsId}" >
+      <option th:each="product: ${products}"
+              th:value="${product.id}"
+              th:text="${product.name}" ></option>
+    </select>
 
   </form>
 </div>

demo/src/main/resources/templates/order-dop.html

@@ -8,9 +8,9 @@
 <div layout:fragment="content">
   <form action="#" th:action="@{/order/dop}" th:object="${productDto}" method="get">
     <div class="mb-3">
-      <label for="author" class="form-label">Продукт</label>
+      <label for="product" class="form-label">Продукт</label>
 
-      <select id="author" class="form-select" th:field="*{id}" th:name="${selectedProduct}">
+      <select id="product" class="form-select" th:field="*{id}" th:name="${selectedProduct}">
         <option th:each="value: ${products}" th:selected="${selectedProduct != null and selectedProduct == value.id}" th:value="${value.id}" th:text="${value.name}"></option>
       </select>
     </div>