SpringBoot + JPA + Thymeleaf로 간단한 CRUD를 만드는 ③～Validation 추가～

내용

절차

1. entity에 유효성 검사 설정 추가

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    @NotEmpty // ①
    private String name;
    @NotNull // ②
    @Min(value = 0) // ③
    @Max(value = 150)
    private Integer age;
    @Size(max = 20) // ④
    private String team;
    private String position;

2. 컨트롤러에 오류 제어 추가

    @GetMapping("new")
    public String newPlayer(Model model) {
        // ①
        Player player = new Player();
        model.addAttribute("player", player);
        return "players/new";
    }

    @PostMapping
    public String create(@Valid @ModelAttribute Player player, BindingResult bindingResult) { // ②
        if(bindingResult.hasErrors()) return "players/new"; // ③
        playerService.save(player);
        return "redirect:/players";
    }

    @PutMapping("{id}")
    public String update(@PathVariable Long id, @Valid @ModelAttribute Player player, BindingResult bindingResult) {
        if(bindingResult.hasErrors()) return "players/edit";
        player.setId(id);
        playerService.save(player);
        return "redirect:/players";
    }

@Valid @ModelAttribute Player player
// ↑と↓は同じ
@Valid
@ModelAttribute
Player player

      <!-- ① -->
      <form th:action="@{/players}" th:method="post" th:object="${player}">
        <!-- ② -->
        <div class="form-group" th:classappend="${#fields.hasErrors('name')}? has-error">
          <label class="control-label">名前</label>
          <input class="form-control" type="text" th:field="*{name}" />
          <!-- ③ -->
          <span class="text-danger" th:if="${#fields.hasErrors('name')}" th:errors="*{name}"></span>
        </div>
        <div class="form-group" th:classappend="${#fields.hasErrors('age')}? has-error">
          <label class="control-label">年齢</label>
          <input class="form-control" type="number" th:field="*{age}" />
          <span class="text-danger" th:if="${#fields.hasErrors('age')}" th:errors="*{age}"></span>
        </div>
        <div class="form-group" th:classappend="${#fields.hasErrors('team')}? has-error">
          <label class="control-label">チーム名</label>
          <input class="form-control" type="text" th:field="*{team}" />
          <span class="text-danger" th:if="${#fields.hasErrors('team')}" th:errors="*{team}"></span>
        </div>
        <div class="form-group" th:classappend="${#fields.hasErrors('position')}? has-error">
          <label class="control-label">守備位置</label>
          <input class="form-control" type="text" th:field="*{position}" />
          <span class="text-danger" th:if="${#fields.hasErrors('position')}" th:errors="*{position}"></span>
        </div>
        <button class="btn btn-default" type="submit">作成</button>
      </form>

edit.html

      <form th:action="@{/players/{id}(id=*{id})}" th:method="put" th:object="${player}">
        <div class="form-group" th:classappend="${#fields.hasErrors('name')}? has-error">
          <label class="control-label">名前</label>
          <input class="form-control" type="text" th:field="*{name}" />
          <span class="text-danger" th:if="${#fields.hasErrors('name')}" th:errors="*{name}"></span>
        </div>
        <div class="form-group" th:classappend="${#fields.hasErrors('age')}? has-error">
          <label class="control-label">年齢</label>
          <input class="form-control" type="number" th:field="*{age}" />
          <span class="text-danger" th:if="${#fields.hasErrors('age')}" th:errors="*{age}"></span>
        </div>
        <div class="form-group" th:classappend="${#fields.hasErrors('team')}? has-error">
          <label class="control-label">チーム名</label>
          <input class="form-control" type="text" th:field="*{team}" />
          <span class="text-danger" th:if="${#fields.hasErrors('team')}" th:errors="*{team}"></span>
        </div>
        <div class="form-group" th:classappend="${#fields.hasErrors('position')}? has-error">
          <label class="control-label">守備位置</label>
          <input class="form-control" type="text" th:field="*{position}" />
          <span class="text-danger" th:if="${#fields.hasErrors('position')}" th:errors="*{position}"></span>
        </div>
        <button class="btn btn-default" type="submit">更新</button>
      </form>

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