我是 Spring 的新手，我正在尝试使用 Spring MVC 和 Thymeleaf 制作 Web 应用程序.我有一个带有用于创建自定义比萨饼和相应控制器的表单的页面.用户可以输入披萨的名称，所以我添加了输入验证.在我输入无效名称之前，一切正常，但是当我返回页面的新视图时，带有复选框的 div 不会出现，它们只是不会生成.刷新后我的模型似乎是空的，但我不明白如何调试它，我在 intellij 想法中的快捷方式不起作用.
I am new to Spring and I am trying to make web application using Spring MVC and Thymeleaf. I have the page with the form to create custom pizza and corresponding controller. User can enter the name of the pizza so I added input validation. Before I enter invalid name everything is ok, but then when I return a new view of the page, divs with my checkboxes do not appear, they just don't generate. It seems like my Model after refreshing is empty but I don't understand how I could debug this, my shortcuts in intellij idea just don't work.
CreatePizzaController:
@Slf4j
@Controller
@RequestMapping("/create")
public class CreatePizzaController {
@GetMapping
public String showCreationForm(Model model){
List<Ingredient> ingredients = Arrays.asList(
new Ingredient("CLS22", "Classic base 22cm", Ingredient.Type.BASIC),
new Ingredient("CLS30", "Classic base 30cm", Ingredient.Type.BASIC),
new Ingredient("PEPE", "Pepperoni", Ingredient.Type.MEAT),
new Ingredient("HAM", "Ham", Ingredient.Type.MEAT),
new Ingredient("CHMPG", "Champignons", Ingredient.Type.VEGGIES),
new Ingredient("CUCU", "Cucumbers", Ingredient.Type.VEGGIES),
new Ingredient("PARM", "Parmesan cheese", Ingredient.Type.CHEESE),
new Ingredient("MOZ", "Mozzarella cheese", Ingredient.Type.CHEESE),
new Ingredient("BARBS", "Barbecue sauce", Ingredient.Type.SAUCE),
new Ingredient("TOMAS", "Tomato sauce", Ingredient.Type.SAUCE)
);
Ingredient.Type[] types = Ingredient.Type.values();
for(Ingredient.Type type: types){
model.addAttribute(type.toString().toLowerCase(), filterByType(ingredients, type));
}
model.addAttribute("create", new Pizza());
return "create";
}
@PostMapping
public String processCreation(@Valid @ModelAttribute("create") Pizza pizza, BindingResult result){
if(result.hasErrors()){
return "create";
}
//Save creation...
log.info("Processing creation: " + pizza);
return "redirect:/orders/current";
}
private List<Ingredient> filterByType(List<Ingredient> ingredients, Ingredient.Type type) {
List<Ingredient> filtered = new ArrayList<>();
for (Ingredient ingredient:ingredients){
if(ingredient.getType() == type){
filtered.add(ingredient);
}
}
return filtered;
}
}
You need to add your model attributes again before returning "create". Thymeleaf isn't incorrect, the model is simply missing attributes and can't populate the checkboxes. Something like this should work:
@GetMapping
public String showCreationForm(Model model){
addCreationFormModelAttributes(model, new Pizza());
return "create";
}
@PostMapping
public String processCreation(Model model, @Valid @ModelAttribute("create") Pizza pizza, BindingResult result){
if(result.hasErrors()){
addCreationFormModelAttributes(model, pizza);
return "create";
}
//Save creation...
log.info("Processing creation: " + pizza);
return "redirect:/orders/current";
}
private static addCreationFormModelAttributes(Model model, Pizza pizza) {
List<Ingredient> ingredients = Arrays.asList(
new Ingredient("CLS22", "Classic base 22cm", Ingredient.Type.BASIC),
new Ingredient("CLS30", "Classic base 30cm", Ingredient.Type.BASIC),
new Ingredient("PEPE", "Pepperoni", Ingredient.Type.MEAT),
new Ingredient("HAM", "Ham", Ingredient.Type.MEAT),
new Ingredient("CHMPG", "Champignons", Ingredient.Type.VEGGIES),
new Ingredient("CUCU", "Cucumbers", Ingredient.Type.VEGGIES),
new Ingredient("PARM", "Parmesan cheese", Ingredient.Type.CHEESE),
new Ingredient("MOZ", "Mozzarella cheese", Ingredient.Type.CHEESE),
new Ingredient("BARBS", "Barbecue sauce", Ingredient.Type.SAUCE),
new Ingredient("TOMAS", "Tomato sauce", Ingredient.Type.SAUCE)
);
Ingredient.Type[] types = Ingredient.Type.values();
for(Ingredient.Type type: types){
model.addAttribute(type.toString().toLowerCase(), filterByType(ingredients, type));
}
model.addAttribute("create", pizza);
}
